23AIR CIRCULATION OF THE HEATING SYSTEMAlways refer to the applicable building code before installing the hot air conduct.For the installation of hotair conduct, always refer tothe building national code.It is recommended to installa floor screen in order tobalance the air pressurebetween the floor where theappliance is installed andthe superior floor.It is also recommended toinstall those floor screen toeach home extremity.An air supply must be installed if :The appliance seems to have an irregular draft control, a smoke return, a badcombustion and a counter-blow even though you have combustion or not.Your other appliances, such as hearths or other heating appliances, release odors, heatbadly, provoke smoke return or a counterblow, even though there is combustion or not.An opened window, even slightly, by a calm temperature (without wind) stops thesituation above.Your home was built with isolated dandruffs and with well adjusted windows, and/orwas built with a mechanism to evacuate the interior air.If, with these indications, there is not enough air infiltration, you must ensure an airsupply.In doubt, it is recommended to ensure an air supply.Hot air pipe : 8" diameter for 20 feet length.6" diameter for 15 feet length.