MINIMUM HEIGHT FROM ROOF |
|
TO LOWEST DISCHARGE OPENING |
|
Roof Pitch | H (Min) |
Flat to 6/12 | 1.0 Feet |
Over 6/12 to 8/12 | 1.5 Feet |
Over 8/12 to 10/12 | 2.5 Feet |
Over 10/12 to 12/12 | 4.0 Feet |
Over 12/12 to 16/12 | 6.0 Feet |
Over 16/12 to 20/12 | 7.5 Feet |
2.All other gas vents shall terminate not less than 2 feet (0.6m) above the highest point where they pass through the roof and at least 2 feet (0.6m) higher than any portion of a building
located within 10 feet (3.1m) as shown in the following illustration.
10ft. or less
Vent Cap Type B
Vent Pipe | 2ft. min. |
| |
Type B |
|
(Double Wall) |
|
Storm Collar
Boot Flashing
2" Clearance
NOTE : To minimize problems associated with condensation in long runs, vent pipe can be insulated.
3.The horizontal venting system approved with this heater consists of the Side Wall Vent Kit (02840) shown are page 3.
4.Limit the quantity of 90° elbows to two. When vent pipe is in a horizontal run, it must be pitched downward ¼ inch per foot towards the vent terminal. The heater must be installed level.
5.The horizontal venting system shall not terminate:
a)Less than 4 feet (1.2m) below, 4 feet (1.2m) horizontally from, or 1 foot (30cm) above any door, window or gravity air inlet into any building. The bottom of the vent terminal shall be located at least 7 feet (2.1m) above grade or above snow accumulation levels as determined by local codes.
b)Less than 3 feet (0.9m) from a combustion air inlet.
c)Less than 3 feet (0.9m) from any other building opening or any gas service regulator.
d)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.
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.
Vent Cap
Type “B” Vent
Vent Pipe (Single Wall)
Seal joint & annular space.
c) Horizontal Through the Sidewall
This heater, when horizontally vented, must be installed with the approved venting system.
When venting the heater horizontally through a combustible outside wall, the same requirements listed previously for Venting Through the Roof apply except as follows:
1.When venting the heater to the outside of the building through a sidewall, use 3 inch O.D.
constructed of galvanized sheet metal or other approved noncombustible,
2.For horizontal venting, the vent lengths may be as follows:
Minimum Equivalent Length = 5 feet of Pipe Maximum Equivalent Length = 25 feet of Pipe
Use the following correction factors to obtain the equivalent length:
a)Subtract 15 feet if the run is horizontal
b)Subtract 10 feet for an approved vent cap.
c)Subtract 10 feet for each elbow beyond 15 feet from the heater.
d)Subtract 15 feet for each elbow within 15 feet of the heater.
EXAMPLE for an approved vent cap you have | 10 ft. |
for a horizontal run you have | 15 ft. |
Your Maximum Equivalent Length is | 25 ft. |
|
| |
18" |
| Vent Pipe |
|
| |
| Wall | Wall Thimble |
|
|
Venting/Ducting
For Commercial and Industrial Installations Only General Requirements
Use aluminum or teflon tape suitable for 550°F (3M Company tapes #433 or #363) or RTV silicone sealant.
Heater must be vented in accordance with specification ANSI Z223.1 - latest revision . Partial information relating to this specification is provided in this section with regard to size and configurations for venting arrangements. For complete information consult ANSI Z223.1 - latest revision and applicable local codes. Use the following guidelines to help insure an adequate, safe ventin arrangement.
Enerco Group, Inc., | 14 | Operating Instructions and Owner’s Manual |