Detroit Radiant Products Company QTS Series - Manual (Page 25)

QTS Series
25
3.0 Installation • Combustion Air Requirements
4 in. 20 ft. 4 in.(single)/6 in.(dual) 20 ft.
5 in. 30 ft. 4 in.(single)/8 in.(dual) 30 ft
6 in. 40 ft. Consult factory for longer intake lengths.
Guidelines:
Air Intake Duct Size Max. Intake Length Duct Size Max. Intake Length
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.
Chart 3.4 • Limitations for Length and Size of Combustion Air Intake Duct
Single Heater Intake Dual Heater Intake
NOTE: Common intake heaters must share the same thermostat.
Figure 3.17 • Vertical Outside Air Supply for Common Heater Intake • Side View
Roof
Roof Intake Cap
18 in.
Minimum 6” pipe
Air Inlet Connection (Flexible boot and band
clamps are recommended)
Air Inlet Connection
Burner
Box
Burner
Box
4” intake pipe 4” intake pipe