Direct Vent Furnace Exhaust Code

Direct vent chimneys or exhaust for heating appliances.

Direct vent furnace exhaust code.

Colour illustration of direct vent sidewall terminal clearance distances adapted from american standard furnace installation instructions that in turn cites ansi z223 1 nfpa 54 national fuel gas code for us installations and cites csa b149 1 natural gas and propane installation code for canadian direct vent gas vent installations. The maximum length of the exhaust duct does not include the transition duct. This article describes side wall vent systems for conventional mid range efficiency heating boilers furnaces water heaters we include for comparison low temperature side wall vent systems used by high efficiency or condensing boilers furnaces water heaters. In non direct vent installations combustion air is taken from indoors and flue gases are discharged outdoors.

The ml193df can be installed as a direct vent or non direct vent gas central furnace. The different types of venting. Note in direct vent installations combustion air is taken from outdoors and flue gases are discharged outdoors. The maximum length of the exhaust duct shall be 35 feet 10 668 mm from the connection to the transition duct from the dryer to the outlet terminal.

Where fittings are used the maximum length of the exhaust duct shall be reduced in accordance with table m1502 4 5 1.