1.0Enershield Canadahttps://enershield.com/carich600338<blockquote class="wp-embedded-content" data-secret="vQlcJc6W49"><a href="https://enershield.com/ca/what-is-an-air-barrier/">What is An Air Barrier?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://enershield.com/ca/what-is-an-air-barrier/embed/#?secret=vQlcJc6W49" width="600" height="338" title="“What is An Air Barrier?” — Enershield Canada" data-secret="vQlcJc6W49" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); </script> https://enershield.com/ca/wp-content/uploads/2020/12/Illustration_Air-Barrier-1.png1442970The principle of using a current of air as an invisible “barrier” between hot and cold zones in entrance areas originated in Europe, where advanced heated duct systems are constructed using powerful blower fans in the ceiling and extraction grids in the floor. However, these systems are often use lots of energy, and are expensive […]