12
- If horizontal runs are necessary then they must always be sloped up at least .25" for
every foot and must be kept shorter than 75% of the total vertical length. Never
terminate the venting horizontally, you need the last bit of vertical run to "pull" the
remaining gasses that may have cooled in the horizontal run.
- If venting through the roof then the termination height will depend on your roof
pitch (consult with an HVAC tech if unsure of needed length). If condensation is a
concern for a specific installation then other more specialized materials should be
used most common is Z-Vent (double walled stainless steel on both in and outside
layers).
- Fresh air intake: The room in which the heater is located must have an air inlet not
less than .75 square feet (roughly 9" x 12" or larger).
- If there are any deviations from these guidelines then please seek the help of a
qualified HVAC technician. Improper venting could be hazardous or even deadly.
Height determined
by roof pitch
Wind/Rain cap
Optional
condensation catch
Coupler
Exhaust Outlet
Fresh air intake
Straight Pipe
B-vent
Roof
72”min.
18”min. rise
before bends
or condensation
catch
DRAWING 04
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