Direct Vent Furnace Exhaust Code
The different types of venting.
Direct vent furnace exhaust code. 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. The maximum length of the exhaust duct does not include the transition duct. Where fittings are used the maximum length of the exhaust duct shall be reduced in accordance with table m1502 4 5 1. Well making sure that you choose the right venting style will protect them.
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 ml193df can be installed as a direct vent or non direct vent gas central furnace. Direct vent chimneys or exhaust for heating appliances. In non direct vent installations combustion air is taken from indoors and flue gases are discharged outdoors.
Note in direct vent installations combustion air is taken from outdoors and flue gases are discharged outdoors.