You ll want your ductwork and the flange to be of the same size.
Venting a gas heater through wall.
You ll need to same tools as the ones required for a roof vent.
Exhaust gases are vented outdoors through a separate vent duct or through a separate chamber of the same pipe this requires a double wall vent duct.
Direct venting or side wall vent chimney and flue systems are a method of venting the exhaust gases from a heating appliance directly out through the side wall of a building while eliminating the need for a vertical chimney of any sort.
Instead both systems typically expel exhaust through a pipe that runs.
Gas or oil fired side wall power vents are provided by several manufacturers listed at the end of this article.
Venting a garage heater through a wall the other solution to ventilating your garage when installing a gas heater is to run the vent duct through the wall of your garage.
Direct vent water heaters with a direct vent system air for combustion is drawn from a vent pipe that runs through an exterior wall or the roof.
The size of the duct you ll use depends on the size of the vent flange on the heater.
Some people prefer this method since this option allows you to maintain the integrity of your roof.