BASIC FLUE VENTING (Residential Only)
•Venting must be in compliance with the latest edition of the National Fuel Gas Code (ANSI. Z223.1 latest edition: or the authority having jurisdiction.
•Uninsulated
•For the installation of a
•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.
Other venting references can be found in equipment volume of the ASHRAE Handbook.
A. SINGLE HEATER VENTING
a) Vertical Through the Roof
NOTE: For residential applications, the heater must not be connected to a separate chimney, but must be installed using the venting system as specified below.
1.When venting the heater to outside of building through a roof, use 3 inch O.D.
2.A vent passing through a combustible roof shall extend through a
3.The maximum equivalent length of vent pipe should be carefully observed. A safety switch in the heater is designed to shut the heater off before excessive flue restriction causes bad combustion.
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)A horizontal run is equal to 15 feet of vent length.
b)An approved vent cap is equal to 10 feet of vent length.
c)For each elbow in the first 15 feet of run, they are equal to 10 feet of vent length.
d)For each elbow past the first 15 feet of run, they are equal to 15 feet of vent length.
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. |
4.Limit the quantity of 90° elbows to two. When vent pipe is in a horizontal run, it must rise not less than ¼ inch per foot from the start of the vent system towards the vent terminal.
5.Joints between sections of piping shall be fastened by sheet metal screws or other approved means.
The seams along the length of the piping and the joints between sections of piping should be sealed to prevent a potential leakage of flue gas into building. Use 100% RTV Silicone Rubber Adhesive sealant suitable for 500°F.
6.All portions of the vent pipe shall be supported to prevent from sagging.
7.When the vent pipe passes through areas where the ambient temperature is likely to induce condensation of the flue gasses, the vent pipe should be insulated and a condensation drain should be provided.
8.The minimum clearance to combustible materials for single- wall flue pipe shall be 6 inches. This may be reduced when the combustible material is protected as specified in the National Fuel Gas Code or the authority having jurisdiction.
9.
10.A venting system shall terminate at least 3 feet (0.9m) above any forced air inlet located within 10 feet (3.1m).
Vent Cap
(Leslie VersaCap)
Type B
| 2' Min. |
| 2' Min. |
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| 2' Min. |
| (when no wall or |
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10' | (when no wall or |
| parapet exist) |
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parapet exist) |
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or less |
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| Flashing |
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| 2" Clearance Thimble |
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| Seal joint & | 4" |
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| Vent |
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| annular space. |
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| Dia. | Total Vent |
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| ¼ per ft. rise | ||
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| Height | |
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(5' Min.)
VERTICAL
THROUGH THE ROOF
Lateral
SINGLE HEATER VENTING
b)Vent Termination (Residential Installations)
1.The vent terminal shall terminate above the roof line so that no discharge opening is less than 2 feet (0.6m) horizontally from the roof surface. The lowest discharge opening will be no closer than the minimum height specified in the following table. These minimum heights may be used provided the vent is not less than 8 feet (2.4m) from any vertical wall or similar obstruction.
Not less than 8ft.
2ft. min.
H (Min.)
Vertical Wall
Enerco Group, Inc., | Operating Instructions and Owner’s Manual |
