Aug 19, 2020 — The direct vent water boiler is another type of water heater venting that you should know about. The air that is used for combustion will come from .... A direct vent system pulls in air from outside and then vents the exhaust through a horizontal pipe. This difference in operation means that you can install a direct​ .... Direct-venting or side wall vent chimney and flue systems are a method of venting the exhaust gases from a heating appliance directly out
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