Form 43471000
Sept 2011
-21-
SINGLE HEATER VENTING
SINGLE HEATER VENTING
SINGLE HEATER VENTING
SINGLE HEATER VENTING
(HORIZONTAL THROUGH SIDEWALL)
(HORIZONTAL THROUGH SIDEWALL)
(HORIZONTAL THROUGH SIDEWALL)
(HORIZONTAL THROUGH SIDEWALL)
This heater, when horizontally vented, must be installed with the approved venting system.
This heater, when horizontally vented, must be installed with the approved venting system.
This heater, when horizontally vented, must be installed with the approved venting system.
This heater, when horizontally vented, must be installed with the approved venting system. When venting the
heater horizontally through a combustible outside sidewall, the same requirements listed previously for venting
Vertical Through The Roof
Vertical Through The Roof
Vertical Through The Roof
Vertical Through The Roof apply except as follows:
1.
For horizontal venting, the vent lengths may be as follows:
•
Minimum Equivalent Length = 5 ft. of pipe
•
Maximum Equivalent Length = 75 ft. of pipe
Use the following correction factors to obtain the equivalent length:
•
Subtract 15 ft. if the run is horizontal.
•
Subtract 10 ft. for an approved vent cap.
•
Subtract 10 ft. for each elbow beyond 15 ft. from the heater.
•
Subtract 15 ft. for each elbow within 15 ft. of the heater.
NOTE:
NOTE:
NOTE:
NOTE: To minimize problems associated with condensation in long horizontal runs, vent pipe can be insulated.
2.
The horizontal venting system approved with this heater consists of the following components: one 4” Vent
Cap (Part #30297040), one 4” x 36” ‘B’ Vent Section (Part #30496360), and one 4” Wall Thimble (Part
#30500040). Please specify the appropriate number of 24-inch sections of single-wall vent pipe and elbows
when ordering: Vent Pipe (Part #30497240), 90º Elbows (Part #30498040), and 45º Elbows (Part
#30499040).
3.
Avoid locating elbows in the first 5 feet of vent pipe whenever possible. Limit the quantity of 90º elbows to
two (2). When vent pipe is in a horizontal run, it must be pitched dow
dow
dow
downward
nward
nward
nward 1/4 inch per foot towards the
vent terminal. The heater must be installed level.
4.
A minimum clearance of 18 inches must be maintained between the outside wall and vent cap (18”
clearance will provide stability under high wind conditions).
5.
The horizontal venting system shall not terminate:
•
Less than 4 ft. (1.2m) below, 4 ft. (1.2m) horizontally from or 1 ft. (30cm) above any door, operable
window or gravity air inlet into any building. The bottom of the vent terminal shall be located at least 7 ft.
(2.1m) above grade or above snow accumulation level as determined by local codes.
•
Less than 3 ft. (0.9m) from a combustion air inlet.
•
Less than 3 ft. (0.9m) from any other building opening or any gas service regulator.
•
Less than 7 ft. (2.1m) above public walkways.
•
Directly over areas where condensate or vapor could create a nuisance or hazard or be harmful to the
operation of gas utility meters, regulators, relief valves, or other equipment. Building materials should
be protected from flue gases and condensate.
•
Less than 12” (0.30m) when directly below a combustible overhang.
6.
In regions of the country where prevailing winds are consistently higher than 40 mph, it may be necessary to
terminate the vent system above the roof level.
#10 Self-Drill
Screws
(typical)
4 Vent Pipe
(horizontal position)
2 (5cm)
Clearance
Thimble
No less than 1/4 (6mm)
fall per foot (0.3m) toward
vent terminal
18 (46cm)
minimum
Draft Inducer
(horizontal position)
Sidewall Vent Cap
(Part No. 30297040)
MULTIPLE HEATER VENTING
MULTIPLE HEATER VENTING
MULTIPLE HEATER VENTING
MULTIPLE HEATER VENTING
(CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
(CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
(CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
(CONNECTIONS INTO A COMMON VENT OR MANIFOLD)
Requirements for venting of multiple heaters are the same as described for SINGLE HEATER VENTING
SINGLE HEATER VENTING
SINGLE HEATER VENTING
SINGLE HEATER VENTING except as
follows:
1.
The common vent size and total vent height is normally determined by the number of heaters per common
vent, length of horizontal connector runs, and connector rise. Connector lengths should be as short as
possible and have a minimum 1/4 inch per foot rise. Without regard to connector rise and total vent height
due to many possible venting configurations, the following should be observed:
•
Common vent pipe & vent connector diameter should be no less than that shown in the following Vent
Sizing Table.
