High Efficiency Gas Furnace Fresh Air Intake

High efficiency pvc or cpvc venting materials and a zero clearance to combustibles.

High efficiency gas furnace fresh air intake.

See reference 5 in sealed combustion units as most high efficiency furnaces are. The exhaust gas of the furnace will not reach over 140 degrees fahrenheit. A heat recovery ventilator or hrv is an optional device separate from the furnace that works as an air to air heat exchanger. Since high efficiency furnaces draw air directly from outside the furnace itself does not require a fresh air intake in order to replace inside air that otherwise would have been drawn from the room the furnace is located in.

Fresh air intake for high efficiency furnaces i am a homeowner in new jersey who recently had a carrier infinity ics modulating gas furnace model 58mvc installed. If a furnace has an afue rating of 90 percent or greater it is considered condensing. When a home is well air sealed or tight it may warrant an optional fresh air intake that pulls air from outdoors into the furnace and prevents partial vacuum situations. The concentric vent kits are normally used on fireplaces or other mid to standard efficiency direct vent appliances mnc123 jan 4 14 at 6 46.