In either case, efficiencies on new appliances don’t vary much between the two configurations. They draw their combustion air from outside and exhaust through a collinear or coaxial pipe. Direct Vent is that the Direct Vent appliances are sealed to the room. These devices are sometimes referred to as “natural-vent”. B-vent appliances use a single exhaust pipe and draw combustion air from the room into the combustion chamber and up through the chimney, but the amount of air they use is minimal. It cannot be terminated to an outside wallī-Vent appliances use pipe (b-vent) that must be installed through the home and terminate above the roof.
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