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VERTICAL TERMINATIONS (100,000 - 150,000 BTU/HR)
When 3 inch pipe is used between the water heater and the
roof, reduce it to 2 inch pipe before penetrating the roof. A
maximum of 18 inches of 2 inch pipe may be used between
the 3 inch transition and the inside of the roof.
The vertical inlet air termination requires a return bend
or two short 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 9A for the proper location of the
air inlet with respect to the exhaust outlet termination. The
vertical exhaust outlet termination is a 2 inch 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. See figure 9A below.
Note: See “Venting Additional Polaris® Units” below if
installing more than one Polaris® gas water heater.
Venting Additional Polaris® Units
(100,000 - 150,000 BTU/hr Models)
When using two (2) Polaris® units, install vent terminations
using either Method A or Method B below:
When using three or more Polaris® units, install vent
terminations per Method C or Method D:
Figure 9A: Vertical Termination (100,000 - 150,000 BTU/Hr Models)