Brant Radiant Heaters QTD Series User Instruction page 25

QTD Series
Figure 3.17 • Vertical Outside Air Supply for Common Heater Intake
Burner
Box
NOTE: Common intake heaters must share the same thermostat.
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.
• Do not draw air from attic space.
• 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.
18 in.
Minimum
Air Inlet Connection
4" intake pipe
Max. Intake Length
20 ft.
30 ft.
40 ft.
3.0 Installation
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.
25
• Combustion Air Requirements
• Side View
Roof
clamps are recommended)
Max. Intake Length
20 ft.
30 ft