Brant Radiant Heaters AVS-40N Instructions Manual page 24

3.0 Installation • Combustion Air Requirements
Figure 3.17 • Horizontal Outside Air Supply for Single Heater Intake
Air Intake Cap
Figure 3.18 • Vertical Outside Air Supply for Common Heater Intake
NOTE: Common intake heaters
must share the same thermostat.
Burner
Box
Guidelines:
Chart 3.4 • Limitations for Length and Size of Combustion Air Intake Duct
Single Heater Intake
Air Intake Duct Size
4 in.
5 in.
6 in.
General
• No more than two (2) 90° degree elbows are allowed.
• Allow for expansion. Use a 4 in. flexible hose to connect the duct to the burner control box.
• In humid environments, use insulated duct, PVC pipe or DWV (drain waste vent) to prevent
condensation on the outer surface.
• A factory approved wall intake cap (P/N: WIV-4) must be used with horizontal outside intake
ducts. The wall intake cap (P/N: WIV-4) must be installed to prevent blockage. Locate the intake
where dirt, steam, snow, etc. will not contaminate or clog the intake screen.
• Separate air intake duct from vent pipe a minimum of 4 ft. Also, place vent pipe higher than
adjacent air intake duct.
Air Inlet Connection (Flexible boot and band clamps are recommended)
Wall
4" pipe
18 in.
Minimum
Air Inlet Connection
4" intake pipe
Max. Intake Length
20 ft.
30 ft.
40 ft.
•
Burner
Box
Roof Intake Cap
6" pipe
Air Inlet Connection (Flexible boot and band
Burner
Box
4" intake pipe
Dual Heater Intake
Duct Size
4 in.(single)/6 in.(dual)
4 in.(single)/8 in.(dual)
Consult factory for longer intake lengths.
24
AVS
Side View
• Side View
Roof
clamps are recommended)
Max. Intake Length
20 ft.
30 ft
Series