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GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 23
Venting for Power Vented Unit Heaters
The venting system for these appliances shall terminate at least four feet (1.2m) below,
four feet (1.2m) horizontal from, or one foot (0.3m) above any door, window, or gravity
air inlet into any building.
Through the wall vents for these appliances shall NOT terminate over public walkways,
or over an area where condensate or vapor could create a nuisance or hazard or could
be detrimental to the operation of regulators, relief valves, or other equipment.
The vent pipe equivalent length must be 5 ft. (1.5m) minimum and must not exceed 50
ft. (15.2m). Equivalent length is the total length of straight sections PLUS 15 ft. (4.6m)
for each 90 degree elbow, 8 ft. (2.4m) for each 45 degree elbow, and 10 ft. (3.0m) for the
vent cap.
Maintain 6 in. (152mm) between vent pipe and combustible materials. A minimum of 12
in. (305mm) of straight pipe is required from the venter outlet before installing an elbow
in the vent system. An elbow should never be attached directly to the venter!
Figure 10. Horizontal left vent position, (rear view of unit heater)
Figure 11. Horizontal right vent position, (rear view of unit heater)
Tee With Drip Leg &
Cleanout C ap At Lowest
Point Of Vent System (Typ.)
D4072
To Horizontal Flue
Vent Termination
Reducer/Increaser
Where Applicable
Power Venter
Power Venter
Tee With Drip Leg &
C leanout C ap At Lowest
Point Of Vent System (Typ.)
D4073
To Horizontal Flue
Vent Termination
Reducer/Increaser
Where Applicable