28
CONCENTRIC VENT INSTALLATION
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installation.
SAFETY CONSIDERATIONS
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Figure 26. 2 Inch Concentric Vent
Figure 27. 3 Inch Concentric Vent
Figure 28. Through the Wall Termination
Figure 29. Through the Roof Termination
Tee with
Drain Trap
See Note 4
Trap
NOTES:
1. Support Horizontal Pipe Every Four Feet.
Support Vertical Pipe Every Six Feet.
2. Increase The 12” Minimum Above
Grade To Keep Inlet Opening
Above
Anticipated
Snow
Levels.
3. Slope All Piping 1/8” Per
Foot
Down Toward The
Water
Heater.
4. For units with inputs of
150,000
BTU/hr
and below,
use 2" or 3" pipe. For units with
inputs
of
175,000 BTU/hr and above,
use only 3" pipe.
5. When venting with 2" pipe, a sufficient
length of 3" pipe (6" minimum) must be
inserted into the exhaust and inlet elbow
assembly before transitioning down to
2" pipe with a 3" x 2" reducer.
6. Connect blocked pressure switch hose
to condensate trap.
See Note 5
See
Note 6
Drain Pan
(Piped to
Adequate
Drain)
3" x 2"
Reducer
Exhaust
Elbow
Assembly
See Note 5
3" x 2"
Reducer
Figure 30. Concentric Vent Piping Installation