13
EXHAUST AND INLET AIR PIPING (CONT.)
VERTICAL TERMINATION
When 3 in. pipe is used between the water heater and the roof, reduce it to 2 in. pipe before penetrating the roof. A maximum of 18 inches of 2 in. pipe may be
used.
The vertical inlet air termination requires a return bend or two medium or long sweep radius 90° elbows to keep the inlet downward and prevent entry of rain.
These elbows are considered part of the termination and should not be included when calculating the maximum allowable vent pipe length. Refer to Figure 12 for
the proper location of the air inlet with respect to the exhaust outlet termination. The vertical exhaust outlet termination is a 2 in. pipe which terminates at least
12 inches above the inlet air termination.
The air inlet and exhaust outlet terminations must be at least 12 inches above the roof line or anticipated snow levels.
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