Venting / Combustion Air Ducting; General Requirements - Berner GR Series Operating And Service Instructions

Venting / Combustion Air Ducting

General Requirements

 Refer to the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) in the USA and CAN/CGA B149.1
and B149.2 Installation Codes in Canada, as well as all local requirements for vertical venting and
general guidance for minimum distances to openings to the building.
 This equipment is of balanced flue construction and must be horizontally vented (see Figure 10).
Vertical venting is permitted, but not as a balanced flue assembly. (See roof venting)
Heater may be sloped
Ø4" Combustion
Air Inlet Duct
Wall Thickness
(Max. 10")
(Min. 1")
NOTES:
1- This Heater may be rotated at 45° Tilt, but both ends of the heater must be kept at the same elevation.
2- Total Vent Length (Including One (1) Elbow) = 10'
Each Additional Elbow = 4'
Max. Number Of Elbows = 2
 A flue/air vent length of 8 feet or less is recommended, although a maximum of 10' feet is
allowable (including one elbow).
 An approved Wall Terminal that allows the air duct to pass through the wall is required. This is
included with your heater. The Wall Terminal is a zero clearance terminal for both combustible
and non-combustible walls.
 For horizontal venting where an elbow is utilized an elbow kit (Part No. RT013) must be used,
refer to Figure 10 for more details.
The 2" inch flue pipe should extend a minimum of 6" inches beyond the end of the 4" inch wall terminal
(for horizontally vented heaters only see Figure 12). Where the vent is under an eave the 2" vent pipe
must have a minimum clearance of 7" from the centerline of the vent to the bottom of the eave, refer to
 Figure 11. However, when the 2" pipe is less than 18" from the bottom of the eave, we
recommend the 2" inch flue extend just beyond the eave to prevent the possibility of frost. (Adhere
to any code requirements for clearances to opening in the building).
 An optional "Horizontal Elbow Vent Terminal" kit for horizontal venting is also available, refer to
Figure 12 and Figure 13
Series GR
1
" in 10 '
4
Vent Elbow Kit
P/N RT013
6
Ø2" Flue
Pipe
Wall Terminal
P/N RS006
Wall Thickness
(Max. 10")
(Min. 1")
Figure 10: Various Venting Orientations
Page 14
Ø4" Combustion
Air Inlet Duct
6
Ø2" Flue Pipe
Ø4" Combustion
Air Inlet Duct
Wall Terminal
P/N RS006
Wall Thickness
(Max. 10")
(Min. 1")
Vent Elbow Kit
P/N RT013
6
Ø2" Flue Pipe
Wall Terminal
P/N RS006
February 10, 2014