Detroit Radiant Products Company QTD Series - Manual (Page 22)

QTD Series
22
3.0 Installation • Venting • Rooftop Venting
Rooftop Venting
Guidelines:
Vent Locations and Clearances
• Separate air intake duct from vent pipe a minimum of 4 ft. (1.2 m) by placing vent pipes higher
than adjacent air intake duct.
• Venting may utilize standard B-vent cap.
• The vent terminal must extend a minimum of 2 ft. (.6 m) above the roof.
*Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.
Figure 3.12 • Rooftop Venting - Side View
Vent Cap
Double-Wall B Vent Pipe
Firestop Spacer
Single-Wall Elbow or
Alternate Tee Fitting
B to C Adapter
Roof*
24 in. Min.*
Heater
Single-Wall Vent
(field supplied)
Storm Collar
Adjustable Roof Flashing
1 in. Minimum Clearance
1 in. Minimum Clearance
#8 Sheet Metal Screws
(field supplied)