With a direct vent system air for combustion is drawn from a vent pipe that runs through an exterior wall or the roof.
Water heater single wall vent.
An exception is made for non combustible walls such as solid masonry or concrete.
6 minimum clearance from single wall vent pipe or flue vent connector to any combustible material.
Single wall natural draft gas water heater vent pipe cannot be used in unheated areas like attic or garage even if only partially penetrating that space because such vent pipe installation will cause excessive condensation on vent pipe walls and compromise proper drafting double wall pipe b vent type is required.
Single wall vent pipes cannot pass through a ceiling floor firewall or wall.
The difference is that a power vent water heater pulls in combustion air from the space.
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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.
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After applying pipe thread tape to the mnpt nipples on your water heater thread the fnpt end of the water heater connector onto the tank and tighten with.
Instead both systems typically expel exhaust through a pipe that runs outside through an exterior wall.