{"id":37166,"date":"2026-06-02T16:25:22","date_gmt":"2026-06-02T14:25:22","guid":{"rendered":"https:\/\/www.heinen-doors.com\/?p=37166"},"modified":"2026-06-19T16:38:15","modified_gmt":"2026-06-19T14:38:15","slug":"ventilated-door","status":"publish","type":"post","link":"https:\/\/www.heinen-doors.com\/en\/ventilated-door\/","title":{"rendered":"Ventilated Doors: Airflow and Security Combined | Heinen Doors"},"content":{"rendered":"\n\n\t<div class=\"text-image full relative overflow-hidden    py-14\"  style=\"background: linear-gradient(45deg, #eef4f8, white);\" >\n\n\t\t\n\t\t\n\t\t<div class=\" container \">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"mt-0 mb-16\">Ventilated Doors: How to Keep Air Moving Without Compromising Security<\/h2>\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t\t<div style=\"grid-template-columns: 75% 1fr;\" class=\"lg:grid  gap-8 \">\n\n\t\t\t\t<div class=\" \">\n\n\t\t\t\t\t<header class=\"flex flex-col hidden\">\n\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t<h1 class=\"mt-0 mb-8 \">Ventilated Doors: How to Keep Air Moving Without Compromising Security<\/h1>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t<\/header>\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"prose text-secondary \">\n\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"15:1-15:286;912-1197\">A ventilated door, also referred to as a louvred door in common usage \u2014 is a door fitted with a louvred grille that allows air to circulate freely between two spaces, whilst maintaining its core functions: physical closure and, where required, fire resistance or security performance.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"17:1-17:174;1199-1372\">These doors are essential wherever a room needs to breathe: plant rooms, boiler rooms, LV switchgear rooms (MCC\/LVDB), bin stores, car parks, server rooms and battery rooms.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"19:1-19:297;1374-1670\">The challenge seems contradictory at first glance. Cutting an opening into a door appears to weaken it by definition. That is precisely where the difference lies between a grille bolted on as an afterthought and a certified, tested louvred grille that is engineered into the door from the outset.<\/p>\n<p>&nbsp;<\/p>\n<h3>Why Do Some Rooms Require a Ventilated Door?<\/h3>\n<p>Certain spaces generate heat, humidity or gases that must be managed continuously \u2014 both for occupant safety and to protect the equipment inside. A solid, airtight door is simply not an option.<\/p>\n<p>Common applications include:<\/p>\n<ul>\n<li>Plant rooms and boiler rooms: heat dissipation and combustion air supply.<\/li>\n<li>LV switchgear and transformer rooms (MCC\/LVDB): equipment cooling.<\/li>\n<li>Bin stores and storage areas: odour control and prevention of gas build-up.<\/li>\n<li>Server rooms and battery rooms: temperature management and hydrogen extraction.<\/li>\n<li>Car parks: ventilation along traffic routes.<\/li>\n<\/ul>\n<p>In each case, the door must ventilate, but it must also perform as a security or fire door.<\/p>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<div class=\"relative\">\n\t\t\t\t\t\t<figure class=\"overflow-hidden    0 \">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"293\" height=\"597\" src=\"https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/porte-ventileee_1.png\" class=\"w-full h-auto object-cover\" alt=\"\" srcset=\"https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/porte-ventileee_1.png 293w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/porte-ventileee_1-221x450.png 221w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/porte-ventileee_1-157x320.png 157w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/porte-ventileee_1-79x160.png 79w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/porte-ventileee_1-236x480.png 236w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/porte-ventileee_1-172x350.png 172w\" sizes=\"(max-width: 293px) 100vw, 293px\" \/>\n\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n\n\n\t<div class=\"text-image full relative overflow-hidden    py-14\" >\n\n\t\t\n\t\t\n\t\t<div class=\" container \">\n\n\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t\t<div style=\"grid-template-columns: 85% 1fr;\" class=\"lg:grid  gap-8 \">\n\n\t\t\t\t<div class=\" \">\n\n\t\t\t\t\t<header class=\"flex flex-col \">\n\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"mt-0 mb-8 \">The Real Challenge: Combining Ventilation With Performance<\/h2>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t<\/header>\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"prose text-secondary \">\n\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"41:1-41:84;2486-2569\">A louvred grille introduces an opening, which can conflict with other requirements:<\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"43:1-44:140;2571-2801\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:91;2571-2661\"><a href=\"https:\/\/www.heinen-doors.com\/en\/products\/burglary-resistant-doors\/\"><strong>Security:<\/strong><\/a> a poorly designed grille becomes a weak point \u2014 a potential attack vector.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:140;2662-2801\"><a href=\"https:\/\/www.heinen-doors.com\/en\/products\/fire-resistant-doors\/\"><strong>Fire compartmentation:<\/strong><\/a> a permanent opening undermines a fire barrier unless the grille closes under heat (the intumescent principle).<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"46:1-46:341;2803-3143\">The answer is not to &#8220;add a grille&#8221; to a standard door. It is to design the door around the required performance from the start. This is the core principle behind Heinen&#8217;s <strong>Metal+ Inside<\/strong> concept: a common tubular steel structure on which fire resistance, security rating and ventilation are combined as required \u2014 performance \u00e0 la carte.<\/p>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\n\t\t\t\t\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n\n\n\t<div class=\"text-image full relative overflow-hidden    py-14\"  style=\"background: linear-gradient(45deg, #eef4f8, white);\" >\n\n\t\t\n\t\t\n\t\t<div class=\" container \">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"mt-0 mb-16\">Heinen&#8217;s Two Louvred Grille Solutions<\/h2>\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t\t<div style=\"grid-template-columns: 25% 1fr;\" class=\"lg:grid  gap-8 \">\n\n\t\t\t\t<div class=\" order-2\">\n\n\t\t\t\t\t<header class=\"flex flex-col hidden\">\n\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"mt-0 mb-8 \">Heinen&#8217;s Two Louvred Grille Solutions<\/h2>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t<\/header>\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"prose text-secondary \">\n\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:108;3192-3299\">Heinen has developed two distinct louvred grille solutions, each addressing a specific set of requirements.<\/p>\n<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"54:1-54:63;3301-3363\">1. The Surface-Mounted Grille \u2014 Aesthetics and Fire Rating<\/h3>\n<ul>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-56:202;3365-3566\">Manufactured from natural anodised aluminium profiles with a stainless steel 304 insect mesh insert, this grille offers a clean finish and can be positioned at the top of the leaf, the bottom, or both.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"58:1-58:58;3568-3625\">Available in two versions: non-fire-rated and fire-rated.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"60:1-60:182;3627-3808\"><a href=\"https:\/\/www.heinen-doors.com\/en\/products\/fire-resistant-doors\/\"><strong>Fire classification<\/strong><\/a> to EN 1634-1 (ISO 834 time-temperature curve), validated by test report from the University of Li\u00e8ge Laboratory: <strong>EI\u2081 30 \/ EI\u2082 30<\/strong> and <strong>EI\u2081 60 \/ EI\u2082 60<\/strong>.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"62:1-62:230;3810-4039\">The fire-rated version uses intumescent elements integrated within the door leaf. The product is also resistant to atmospheric conditions (UV, heat, cold, humidity), making it equally suited to internal and external applications.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"64:1-64:119;4041-4159\"><strong>Standard sizes:<\/strong> 4 formats ranging from 380 \u00d7 580 mm (leaf width \u2265 580 mm) to 880 \u00d7 680 mm (leaf width \u2265 1,080 mm).<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:98;4161-4258\"><strong>Free air area:<\/strong> up to 24 dm\u00b2 (non-fire-rated) and 16.56 dm\u00b2 (fire-rated), depending on format.<\/li>\n<\/ul>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<div class=\"relative\">\n\t\t\t\t\t\t<figure class=\"overflow-hidden    0 \">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"397\" height=\"645\" src=\"https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/ventllation-applique.png\" class=\"w-full h-auto object-cover\" alt=\"\" srcset=\"https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/ventllation-applique.png 397w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/ventllation-applique-277x450.png 277w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/ventllation-applique-197x320.png 197w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/ventllation-applique-98x160.png 98w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/ventllation-applique-295x480.png 295w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/ventllation-applique-215x350.png 215w\" sizes=\"(max-width: 397px) 100vw, 397px\" \/>\n\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n\n\n\t<div class=\"text-image full relative overflow-hidden    py-14\"  style=\"background: linear-gradient(45deg, #eef4f8, white);\" >\n\n\t\t\n\t\t\n\t\t<div class=\" container \">\n\n\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t\t<div style=\"grid-template-columns: 75% 1fr;\" class=\"lg:grid  gap-8 \">\n\n\t\t\t\t<div class=\" \">\n\n\t\t\t\t\t<header class=\"flex flex-col \">\n\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t<\/header>\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"prose text-secondary \">\n\t\t\t\t\t\t\t<h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"70:1-70:74;4265-4338\">2. The Punched Louvred Grille \u2014 Fire Resistance and Security Combined<\/h3>\n<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"72:1-72:251;4340-4590\">Developed in-house by Heinen, this grille consists of louvres embossed directly into the door&#8217;s cover plates. The finish is identical to that of the leaf (Magnelis\u00ae ZM 250 galvanised steel or stainless steel 304\/316), for seamless visual integration.<\/p>\n<ul>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"74:1-75:105;4592-4742\"><strong>Security performance<\/strong> (to EN 1627\u20131630):<br \/>\nCR2 and CR3 \u2014 no dimensional restriction (excluding free egress); CR4 \u2014 up to a module height of 235 mm.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"77:1-77:128;4744-4871\"><strong>LPS 1175 D10 compliance<\/strong> (a loss-prevention standard widely recognised by UK insurers): up to a grille size of 320 \u00d7 200 mm.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"79:1-79:76;4873-4948\"><strong>Fire rating:<\/strong> EI\u2081 30 \/ EI\u2082 30 and EI\u2081 60 \/ EI\u2082 60 (intumescent version).<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"81:1-81:78;4950-5027\"><strong>Combined fire + security on a single grille:<\/strong> possible up to 510 \u00d7 310 mm.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"83:1-83:143;5029-5171\"><strong>Standard format:<\/strong> height 235 mm (15 louvres), width equal to leaf width minus 210 mm. Bespoke sizing is available for non-fire-rated doors.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"85:1-85:69;5173-5241\"><strong>Positioning:<\/strong> bottom, top, top and bottom, or full-leaf coverage.<\/li>\n<li class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"87:1-87:213;5243-5455\"><strong>Free air area:<\/strong> dependent on leaf width; the fire-rated version reduces airflow by approximately 31%. Example: a 900 mm leaf provides approximately 3.34 dm\u00b2 free area (or \u2248 2.30 dm\u00b2 in the fire-rated version).<\/li>\n<\/ul>\n<blockquote class=\"ml-2 border-l-4 border-[hsl(var(--border-300)\/0.1)] pl-4 text-text-300\" data-sourcepos=\"89:1-89:116;5457-5572\">\n<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"89:3-89:116;5459-5572\"><strong>Important:<\/strong> both grilles are integrated during door manufacture.<\/p>\n<\/blockquote>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<div class=\"relative\">\n\t\t\t\t\t\t<figure class=\"overflow-hidden    0 \">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"755\" height=\"754\" src=\"https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2024\/12\/cabine-electrique-e1781100971218.jpg\" class=\"w-full h-auto object-cover\" alt=\"cabine-electrique\" \/>\n\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n\n\n\t<div class=\"text-image full relative overflow-hidden    py-14\" >\n\n\t\t\n\t\t\n\t\t<div class=\" container \">\n\n\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t\t<div style=\"grid-template-columns: 100% 1fr;\" class=\"lg:grid  gap-8 \">\n\n\t\t\t\t<div class=\" \">\n\n\t\t\t\t\t<header class=\"flex flex-col \">\n\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"mt-0 mb-8 \">Which Heinen Doors Can Be Supplied With Ventilation?<\/h2>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t<\/header>\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"prose text-secondary \">\n\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"95:1-95:78;5636-5713\">Louvred grilles are available as an option across most Metal+ configurations:<\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"97:1-101:36;5715-5844\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"97:1-97:25;5715-5739\">Single leaf swing door<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"98:1-98:25;5740-5764\">Double leaf swing door<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"99:1-99:27;5765-5791\">Rebated single leaf door<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"100:1-100:17;5792-5808\">XXL swing door<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"101:1-101:36;5809-5844\">Double door without door priority<\/li>\n<\/ul>\n<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"103:1-103:102;5846-5947\">All available in Magnelis\u00ae ZM 250 galvanised steel or stainless steel 304\/316, to bespoke dimensions.<\/p>\n<p><!-- \/wp:paragraph --><\/p>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\n\t\t\t\t\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n\n\n\t<div class=\"text-image full relative overflow-hidden    py-14\"  style=\"background: linear-gradient(45deg, #eef4f8, white);\" >\n\n\t\t\n\t\t\n\t\t<div class=\" container \">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"mt-0 mb-16\">Typical Sectors and Applications<\/h2>\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t\t<div style=\"grid-template-columns: 50% 1fr;\" class=\"lg:grid  gap-8 \">\n\n\t\t\t\t<div class=\" \">\n\n\t\t\t\t\t<header class=\"flex flex-col hidden\">\n\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t<h2 class=\"mt-0 mb-8 \">Typical Sectors and Applications<\/h2>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t<\/header>\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"prose text-secondary \">\n\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"109:1-109:171;5991-6161\">Because they address a universal challenge \u2014 keeping a room ventilated without sacrificing security \u2014 Heinen ventilated doors are specified across virtually every sector:<\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"111:1-119:117;6163-7664\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"111:1-111:196;6163-6358\"><strong>Culture, education and sport:<\/strong> museums, schools and leisure centres all house boiler rooms and plant rooms that need ventilating, in buildings where aesthetics matter as much as fire safety.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"112:1-112:190;6359-6548\"><strong>Energy and nuclear:<\/strong> critical plant rooms combining ventilation, access control and security rating \u2014 transformer rooms, battery rooms and spaces requiring heat or hydrogen extraction.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"113:1-113:202;6549-6750\"><strong>Retail and distribution:<\/strong> technical rooms in large commercial premises (refrigeration plant, LV switchgear, bin stores) where airflow must be maintained without compromising fire compartmentation.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"114:1-114:210;6751-6960\"><strong>High security:<\/strong> data centres, sensitive sites and custodial facilities, where the punched louvred grille combines ventilation, forced-entry resistance (CR2\u2013CR4, LPS 1175) and fire rating in a single door.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"115:1-115:135;6961-7095\"><strong>Industry:<\/strong> process plant protection with heat and atmosphere management \u2014 boiler rooms, process areas and electrical switchrooms.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"116:1-116:114;7096-7209\"><strong>Car parks:<\/strong> ventilation of traffic routes and plant rooms, for exhaust gas extraction and equipment cooling.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"117:1-117:187;7210-7396\"><strong>Residential and commercial:<\/strong> apartment blocks and office buildings whose bin stores, boiler rooms, LV switchgear rooms and shared car parks require controlled, discreet ventilation.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"118:1-118:151;7397-7547\"><strong>Social and healthcare:<\/strong> hospitals, care homes and social housing, where plant rooms demand ventilation, hygiene and fire safety in equal measure.<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"119:1-119:117;7548-7664\"><strong>Transport:<\/strong> plant rooms in rail, airport and road infrastructure \u2014 signalling rooms, LV switchgear and tunnels.<\/li>\n<\/ul>\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\n\t\t\t\t\t\t\t\t\t<div class=\"relative\">\n\t\t\t\t\t\t<figure class=\"overflow-hidden    0 \">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"745\" height=\"782\" src=\"https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites.jpg\" class=\"w-full h-auto object-cover\" alt=\"\" srcset=\"https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites.jpg 745w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites-429x450.jpg 429w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites-305x320.jpg 305w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites-152x160.jpg 152w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites-732x768.jpg 732w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites-457x480.jpg 457w, https:\/\/www.heinen-doors.com\/wp-content\/uploads\/2026\/06\/secteurs-dactivites-333x350.jpg 333w\" sizes=\"(max-width: 745px) 100vw, 745px\" \/>\n\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\n<div class=\"faq-block-container py-8 \">\n\t<div\n\t\tclass=\"container mx-auto\">\n\n\t\t\t\t\t\t\t<h2 class=\"mb-8\">\n\t\t\t\tFrequently Asked Questions \u2014 Ventilated Doors\n\t\t\t<\/h2>\n\t\t\n\t\t\t\t\t\t\t<div class=\" faq-accordion\" id=\"faq-6a3567431f1cd\">\n\t\t\t\t\t\t\t\t\t<div\n\t\t\t\t\t\tclass=\"mb-4 overflow-hidden transition-all duration-300 border border-gray-200 rounded-lg faq-item hover:shadow-md\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<button class=\"w-full p-6 text-left transition-colors duration-200 bg-white faq-question-button hover:bg-gray-50 focus:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-inset\" aria-expanded=\"false\" aria-controls=\"faq-6a3567431f1cd-answer-1\" id=\"faq-6a3567431f1cd-question-1\">\n\t\t\t\t\t\t\t<div class=\"flex items-center justify-between\">\n\t\t\t\t\t\t\t\t<h3 class=\"pr-4 text-lg font-semibold text-gray-800\">\n\t\t\t\t\t\t\t\t\tWhat is a ventilated door (or louvred door)?\n\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"flex-shrink-0 transition-transform duration-300 faq-chevron\">\n\t\t\t\t\t\t\t\t\t<svg class=\"w-5 h-5 text-gray-500\" fill=\"none\" stroke=\"currentColor\" viewbox=\"0 0 24 24\">\n\t\t\t\t\t\t\t\t\t\t<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19 9l-7 7-7-7\"><\/path>\n\t\t\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/button>\n\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"overflow-hidden transition-all duration-300 ease-in-out faq-answer\" style=\"max-height: 0px;\" id=\"faq-6a3567431f1cd-answer-1\" aria-labelledby=\"faq-6a3567431f1cd-question-1\" role=\"region\">\n\t\t\t\t\t\t\t<div class=\"p-6 pt-0 border-t border-gray-100 \">\n\t\t\t\t\t\t\t\t<div class=\"prose prose-gray max-w-none\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">A ventilated door, sometimes called a louvred door, is fitted with a louvred grille that allows air to circulate between two spaces whilst maintaining physical closure and, depending on the specification, fire resistance or security performance.<\/p>\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div\n\t\t\t\t\t\tclass=\"mb-4 overflow-hidden transition-all duration-300 border border-gray-200 rounded-lg faq-item hover:shadow-md\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<button class=\"w-full p-6 text-left transition-colors duration-200 bg-white faq-question-button hover:bg-gray-50 focus:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-inset\" aria-expanded=\"false\" aria-controls=\"faq-6a3567431f1cd-answer-2\" id=\"faq-6a3567431f1cd-question-2\">\n\t\t\t\t\t\t\t<div class=\"flex items-center justify-between\">\n\t\t\t\t\t\t\t\t<h3 class=\"pr-4 text-lg font-semibold text-gray-800\">\n\t\t\t\t\t\t\t\t\tCan a ventilated door also be a security door?\n\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"flex-shrink-0 transition-transform duration-300 faq-chevron\">\n\t\t\t\t\t\t\t\t\t<svg class=\"w-5 h-5 text-gray-500\" fill=\"none\" stroke=\"currentColor\" viewbox=\"0 0 24 24\">\n\t\t\t\t\t\t\t\t\t\t<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19 9l-7 7-7-7\"><\/path>\n\t\t\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/button>\n\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"overflow-hidden transition-all duration-300 ease-in-out faq-answer\" style=\"max-height: 0px;\" id=\"faq-6a3567431f1cd-answer-2\" aria-labelledby=\"faq-6a3567431f1cd-question-2\" role=\"region\">\n\t\t\t\t\t\t\t<div class=\"p-6 pt-0 border-t border-gray-100 \">\n\t\t\t\t\t\t\t\t<div class=\"prose prose-gray max-w-none\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">Yes. Heinen&#8217;s punched ventilation grille is certified to security classes CR2 and CR3 (no dimensional restriction, excluding free egress) and CR4 up to a module height of 235 mm, in accordance with EN 1627\u20131630. It also meets LPS 1175 D10 up to a grille size of 320 \u00d7 200 mm \u2014 a standard widely recognised within the UK insurance market.<\/p>\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div\n\t\t\t\t\t\tclass=\"mb-4 overflow-hidden transition-all duration-300 border border-gray-200 rounded-lg faq-item hover:shadow-md\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<button class=\"w-full p-6 text-left transition-colors duration-200 bg-white faq-question-button hover:bg-gray-50 focus:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-inset\" aria-expanded=\"false\" aria-controls=\"faq-6a3567431f1cd-answer-3\" id=\"faq-6a3567431f1cd-question-3\">\n\t\t\t\t\t\t\t<div class=\"flex items-center justify-between\">\n\t\t\t\t\t\t\t\t<h3 class=\"pr-4 text-lg font-semibold text-gray-800\">\n\t\t\t\t\t\t\t\t\tCan a fire door be ventilated?\n\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"flex-shrink-0 transition-transform duration-300 faq-chevron\">\n\t\t\t\t\t\t\t\t\t<svg class=\"w-5 h-5 text-gray-500\" fill=\"none\" stroke=\"currentColor\" viewbox=\"0 0 24 24\">\n\t\t\t\t\t\t\t\t\t\t<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19 9l-7 7-7-7\"><\/path>\n\t\t\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/button>\n\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"overflow-hidden transition-all duration-300 ease-in-out faq-answer\" style=\"max-height: 0px;\" id=\"faq-6a3567431f1cd-answer-3\" aria-labelledby=\"faq-6a3567431f1cd-question-3\" role=\"region\">\n\t\t\t\t\t\t\t<div class=\"p-6 pt-0 border-t border-gray-100 \">\n\t\t\t\t\t\t\t\t<div class=\"prose prose-gray max-w-none\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">Yes. Both Heinen grilles are available in fire-rated versions, classified EI\u2081 30 \/ EI\u2082 30 and EI\u2081 60 \/ EI\u2082 60 to EN 1634-1. They incorporate intumescent elements that seal the opening under heat, preserving fire compartmentation.<\/p>\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div\n\t\t\t\t\t\tclass=\"mb-4 overflow-hidden transition-all duration-300 border border-gray-200 rounded-lg faq-item hover:shadow-md\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<button class=\"w-full p-6 text-left transition-colors duration-200 bg-white faq-question-button hover:bg-gray-50 focus:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-inset\" aria-expanded=\"false\" aria-controls=\"faq-6a3567431f1cd-answer-4\" id=\"faq-6a3567431f1cd-question-4\">\n\t\t\t\t\t\t\t<div class=\"flex items-center justify-between\">\n\t\t\t\t\t\t\t\t<h3 class=\"pr-4 text-lg font-semibold text-gray-800\">\n\t\t\t\t\t\t\t\t\tIs it possible to combine fire resistance and security on the same ventilated door?\n\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"flex-shrink-0 transition-transform duration-300 faq-chevron\">\n\t\t\t\t\t\t\t\t\t<svg class=\"w-5 h-5 text-gray-500\" fill=\"none\" stroke=\"currentColor\" viewbox=\"0 0 24 24\">\n\t\t\t\t\t\t\t\t\t\t<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19 9l-7 7-7-7\"><\/path>\n\t\t\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/button>\n\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"overflow-hidden transition-all duration-300 ease-in-out faq-answer\" style=\"max-height: 0px;\" id=\"faq-6a3567431f1cd-answer-4\" aria-labelledby=\"faq-6a3567431f1cd-question-4\" role=\"region\">\n\t\t\t\t\t\t\t<div class=\"p-6 pt-0 border-t border-gray-100 \">\n\t\t\t\t\t\t\t\t<div class=\"prose prose-gray max-w-none\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">Yes, with the punched grille, up to a grille size of 510 \u00d7 310 mm.<\/p>\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div\n\t\t\t\t\t\tclass=\"mb-4 overflow-hidden transition-all duration-300 border border-gray-200 rounded-lg faq-item hover:shadow-md\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<button class=\"w-full p-6 text-left transition-colors duration-200 bg-white faq-question-button hover:bg-gray-50 focus:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-inset\" aria-expanded=\"false\" aria-controls=\"faq-6a3567431f1cd-answer-5\" id=\"faq-6a3567431f1cd-question-5\">\n\t\t\t\t\t\t\t<div class=\"flex items-center justify-between\">\n\t\t\t\t\t\t\t\t<h3 class=\"pr-4 text-lg font-semibold text-gray-800\">\n\t\t\t\t\t\t\t\t\tHow much free air area do Heinen ventilation grilles provide?\n\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"flex-shrink-0 transition-transform duration-300 faq-chevron\">\n\t\t\t\t\t\t\t\t\t<svg class=\"w-5 h-5 text-gray-500\" fill=\"none\" stroke=\"currentColor\" viewbox=\"0 0 24 24\">\n\t\t\t\t\t\t\t\t\t\t<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19 9l-7 7-7-7\"><\/path>\n\t\t\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/button>\n\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"overflow-hidden transition-all duration-300 ease-in-out faq-answer\" style=\"max-height: 0px;\" id=\"faq-6a3567431f1cd-answer-5\" aria-labelledby=\"faq-6a3567431f1cd-question-5\" role=\"region\">\n\t\t\t\t\t\t\t<div class=\"p-6 pt-0 border-t border-gray-100 \">\n\t\t\t\t\t\t\t\t<div class=\"prose prose-gray max-w-none\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">This depends on the model and dimensions. The surface-mounted grille offers up to 24 dm\u00b2 (non-fire-rated). The fire-rated version reduces this figure \u2014 by approximately 31% for the punched grille.<\/p>\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div\n\t\t\t\t\t\tclass=\"mb-4 overflow-hidden transition-all duration-300 border border-gray-200 rounded-lg faq-item hover:shadow-md\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<button class=\"w-full p-6 text-left transition-colors duration-200 bg-white faq-question-button hover:bg-gray-50 focus:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-inset\" aria-expanded=\"false\" aria-controls=\"faq-6a3567431f1cd-answer-6\" id=\"faq-6a3567431f1cd-question-6\">\n\t\t\t\t\t\t\t<div class=\"flex items-center justify-between\">\n\t\t\t\t\t\t\t\t<h3 class=\"pr-4 text-lg font-semibold text-gray-800\">\n\t\t\t\t\t\t\t\t\tCan a ventilation grille be added to an existing door?\n\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"flex-shrink-0 transition-transform duration-300 faq-chevron\">\n\t\t\t\t\t\t\t\t\t<svg class=\"w-5 h-5 text-gray-500\" fill=\"none\" stroke=\"currentColor\" viewbox=\"0 0 24 24\">\n\t\t\t\t\t\t\t\t\t\t<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19 9l-7 7-7-7\"><\/path>\n\t\t\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/button>\n\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"overflow-hidden transition-all duration-300 ease-in-out faq-answer\" style=\"max-height: 0px;\" id=\"faq-6a3567431f1cd-answer-6\" aria-labelledby=\"faq-6a3567431f1cd-question-6\" role=\"region\">\n\t\t\t\t\t\t\t<div class=\"p-6 pt-0 border-t border-gray-100 \">\n\t\t\t\t\t\t\t\t<div class=\"prose prose-gray max-w-none\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">No. Grilles are integrated during door manufacture. The fire-rated version in particular cannot be retrofitted.<\/p>\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div\n\t\t\t\t\t\tclass=\"mb-4 overflow-hidden transition-all duration-300 border border-gray-200 rounded-lg faq-item hover:shadow-md\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<button class=\"w-full p-6 text-left transition-colors duration-200 bg-white faq-question-button hover:bg-gray-50 focus:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-inset\" aria-expanded=\"false\" aria-controls=\"faq-6a3567431f1cd-answer-7\" id=\"faq-6a3567431f1cd-question-7\">\n\t\t\t\t\t\t\t<div class=\"flex items-center justify-between\">\n\t\t\t\t\t\t\t\t<h3 class=\"pr-4 text-lg font-semibold text-gray-800\">\n\t\t\t\t\t\t\t\t\tWhat materials are used for the grilles?\n\t\t\t\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"flex-shrink-0 transition-transform duration-300 faq-chevron\">\n\t\t\t\t\t\t\t\t\t<svg class=\"w-5 h-5 text-gray-500\" fill=\"none\" stroke=\"currentColor\" viewbox=\"0 0 24 24\">\n\t\t\t\t\t\t\t\t\t\t<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M19 9l-7 7-7-7\"><\/path>\n\t\t\t\t\t\t\t\t\t<\/svg>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/button>\n\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"overflow-hidden transition-all duration-300 ease-in-out faq-answer\" style=\"max-height: 0px;\" id=\"faq-6a3567431f1cd-answer-7\" aria-labelledby=\"faq-6a3567431f1cd-question-7\" role=\"region\">\n\t\t\t\t\t\t\t<div class=\"p-6 pt-0 border-t border-gray-100 \">\n\t\t\t\t\t\t\t\t<div class=\"prose prose-gray max-w-none\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">The surface-mounted grille is manufactured from anodised aluminium with a stainless steel 304 insect mesh.<\/p>\n<p class=\"p1\">The punched grille matches the leaf finish: Magnelis\u00ae ZM 250 galvanised steel or stainless steel 304\/316.<\/p>\n<p class=\"p1\">\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t<\/div>\n<\/div>\n\n<style>\n\t.faq-item.expanded .faq-chevron {\n\t\ttransform: rotate(180deg);\n\t}\n\n\t.faq-item.expanded .faq-question-button {\n\t\tbackground-color: #f9fafb;\n\t}\n\n\t.faq-answer {\n\t\tmax-height: 0;\n\t\toverflow: hidden;\n\t\ttransition: max-height 0.3s ease-in-out;\n\t}\n\n\t.faq-item.expanded .faq-answer {\n\t\ttransition: max-height 0.3s ease-in-out;\n\t}\n\n\t\/* Am\u00e9lioration des focus pour l'accessibilit\u00e9 *\/\n\t.faq-question-button:focus {\n\t\toutline: 2px solid transparent;\n\t\toutline-offset: 2px;\n\t}\n\n\t\/* Animation des bordures au hover *\/\n\t.faq-item:hover {\n\t\tborder-color: #d1d5db;\n\t}\n\n\t.faq-item.expanded {\n\t\tborder-color: #6b7280;\n\t\tbox-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);\n\t}\n\n\t\/* Styles pour la classe prose (r\u00e9ponses) *\/\n\t.prose {\n\t\tcolor: #374151;\n\t\tline-height: 1.75;\n\t}\n\n\t.prose p {\n\t\tmargin-bottom: 1.25em;\n\t}\n\n\t.prose p:last-child {\n\t\tmargin-bottom: 0;\n\t}\n\n\t.prose h1,\n\t.prose h2,\n\t.prose h3,\n\t.prose h4,\n\t.prose h5,\n\t.prose h6 {\n\t\tcolor: #111827;\n\t\tfont-weight: 600;\n\t\tmargin-top: 1.5em;\n\t\tmargin-bottom: 0.75em;\n\t}\n\n\t.prose h1:first-child,\n\t.prose h2:first-child,\n\t.prose h3:first-child {\n\t\tmargin-top: 0;\n\t}\n\n\t.prose ul,\n\t.prose ol {\n\t\tmargin-bottom: 1.25em;\n\t\tpadding-left: 1.5em;\n\t}\n\n\t.prose li {\n\t\tmargin-bottom: 0.5em;\n\t}\n\n\t.prose strong {\n\t\tfont-weight: 600;\n\t\tcolor: #111827;\n\t}\n\n\t.prose a {\n\t\tcolor: #3b82f6;\n\t\ttext-decoration: underline;\n\t\tfont-weight: 500;\n\t}\n\n\t.prose a:hover {\n\t\tcolor: #1d4ed8;\n\t}\n<\/style>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2359,"featured_media":37361,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"page.php","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1012],"tags":[],"class_list":["post-37166","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ventilated Doors: Airflow and Security Combined | Heinen Doors | Actualit\u00e9s | Heinen<\/title>\n<meta name=\"description\" content=\"Heinen ventilated doors deliver airflow in technical rooms whilst maintaining fire resistance (EI 30\/60 to EN 1634-1) and security (CR2\u2013CR4, LPS 1175 D10). 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