beautypg.com

Rooftop venting – Detroit Radiant Products Company DES3 Series User Manual

Page 26

background image

26

3.0

Installation

Sidewall Venting • Roof Venting

Vent Termination

United States:

• Vent must terminate a minimum of 4 ft. (1.2 m) below, 4 ft. (1.2 m) horizontally from, or 1 ft.

(30 cm) above any window or door that may be opened or gravity air inlet into the building.

• Vent must terminate a minimum of 3 ft. (.9 m) above any forced air inlet that is located within

10 ft. (3.1 m).

• The bottom of the vent terminal must be located a minimum of 12 in. (30 cm) above grade level

and must extend beyond any combustible overhang. Vents adjacent to public walkways must

terminate a minimum of 7 ft. (2.1 m) above grade level.

• The vent terminal must be installed to prevent blockage by snow and protect building materials

from degradation by flue gases.

• The vent cap must be a minimum of 6 in. (15.2 cm) from the sidewall of the building.

• Vent must be a minimum of 36 in. below or extend beyond any combustible overhang.

• Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.

Canada:

• Vents must terminate a minimum of 3 ft. (.9 m) from a window or door that may be opened, and

non-mechanical air supply inlet or combustion air inlet into the building.

• Vents must terminate a minimum of 6 ft. (1.8 m) from a mechanical air supply inlet.

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.

Figure 3.23

Rooftop Venting - Side View

*Consult the NFPA ANSI Z223.1 Gas
Vent Termination criteria if roof pitch
exceeds 9:12.

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 Pipe

This manual is related to the following products: