1.0Enginia S.r.l.https://www.enginiasrl.com/en/aitechttps://www.enginiasrl.com/en/author/aitec/rich600338<blockquote class="wp-embedded-content" data-secret="FaAX6qY7yA"><a href="https://www.enginiasrl.com/en/products/dampers/backdraft-damper/">Backdraft Damper</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.enginiasrl.com/en/products/dampers/backdraft-damper/embed/#?secret=FaAX6qY7yA" width="600" height="338" title="“Backdraft Damper” — Enginia S.r.l." data-secret="FaAX6qY7yA" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /*! This file is auto-generated */ !function(c,l){"use strict";var e=!1,o=!1;if(l.querySelector)if(c.addEventListener)e=!0;if(c.wp=c.wp||{},c.wp.receiveEmbedMessage);else if(c.wp.receiveEmbedMessage=function(e){var t=e.data;if(!t);else if(!(t.secret||t.message||t.value));else if(/[^a-zA-Z0-9]/.test(t.secret));else{for(var r,s,a,i=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),n=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),o=0;o<n.length;o++)n[o].style.display="none";for(o=0;o<i.length;o++)if(r=i[o],e.source!==r.contentWindow);else{if(r.removeAttribute("style"),"height"===t.message){if(1e3<(s=parseInt(t.value,10)))s=1e3;else if(~~s<200)s=200;r.height=s}if("link"===t.message)if(s=l.createElement("a"),a=l.createElement("a"),s.href=r.getAttribute("src"),a.href=t.value,a.host===s.host)if(l.activeElement===r)c.top.location.href=t.value}}},e)c.addEventListener("message",c.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",t,!1),c.addEventListener("load",t,!1);function t(){if(o);else{o=!0;for(var e,t,r,s=-1!==navigator.appVersion.indexOf("MSIE 10"),a=!!navigator.userAgent.match(/Trident.*rv:11\./),i=l.querySelectorAll("iframe.wp-embedded-content"),n=0;n<i.length;n++){if(!(r=(t=i[n]).getAttribute("data-secret")))r=Math.random().toString(36).substr(2,10),t.src+="#?secret="+r,t.setAttribute("data-secret",r);if(s||a)(e=t.cloneNode(!0)).removeAttribute("security"),t.parentNode.replaceChild(e,t);t.contentWindow.postMessage({message:"ready",secret:r},"*")}}}}(window,document); </script> https://www.enginiasrl.com/wp-content/uploads/2019/12/enginia_Serranda-di-Sovrapressione_IMG_3391-resize.jpg12001242The backdraft dampers designed by Enginia are noiseless, with snap-on flanges that can be attached to the entering or leaving side of the damper frame. They have lateral seals and blades can be linked. They can be completed with adjustable counterweights.