Detroit Radiant Products Company LS3 Series - Manual (Page 32)

32
LS3 Series
Combustion Air Supply - Room Air
Combustion air may be supplied to the heater by indoor or outdoor means.
If using combustion air from indoors, the required volume of the space must be a minimum of 50 ft 3 per
1000 Btu/hr unless the building is of unusually tight construction. If the building is of unusually tight
construction with air infiltration rates of less than 0.40 air changes per hour, outside combustion air is
typically needed unless the sheer size of the building allows otherwise. Contact the factory for further
determination of air infiltration rates.
3.0 Installation • Separated Combustion Systems • Combustion Air Requirements
Figure 3.21 • Outside Combustion Air Vertical Intake - Side View
Roof
Exhaust Vent
(from any other appliance)
18 in.
Min.
Combustion Air
Intake Cap
Burner
Control Box
X
3 ft. Min.
(If X if less than 10 ft.)
Storm Collar
Listed
Flashing
Cleanout Tee
Figure 3.22 • Outside Combustion Air Sidewall Intake - Side View
Burner
Control Box
Air Inlet Connection (Flexible boot and
band clamps are recommended)
Combustion Air
Intake Cap
Vent Termination
Support Brackets
1/4 in. pitch per foot
(upward or downward)
6 in.
Min.
Listed Wall Thimble
4” Pipe
Air Inlet Connection (Flexible boot and
band clamps are recommended)