Installation of Standard Indoor Venting
Standard Indoor Venting uses one penetration through an exterior wall or roof for venting the flue exhaust. The combustion air is supplied from the air inside the building. Units must not be installed in a potentially explosive, flammable, or corrosive atmosphere. To prevent premature heat exchanger failure, do not locate unit where chlorinated, halogenated or acid vapors are present.
When units are installed in tightly sealed buildings, provisions should be made to supply an adequate amount of infiltration air from the outside. The rule of thumb is that an opening of one square inch should be provided for every 1000 BTUs per hour of input rating.
Vent terminals must be used. Construct the vent system as shown in the drawings. Reference the Vent Pipe Diameter table and Exhaust Vent Pipe table for additional details.
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| Exterior | |||||
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| A = 12 inch minimum |
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| Wall | ||||
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| Pitch vent pipe |
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| downward |
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| from furnace |
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| ¼ inch per foot |
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| A |
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| EXHAUST |
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| Air Inlet |
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| Exhaust | |||||||||
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| Vent | |||||
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| Terminal | |||||
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Standard Indoor Venting - Horizontal
Vent Pipe Diameter
Select the vent pipe diameter. Use only the specified pipe diameter.
Furnace Size | Exhaust Pipe Diameter |
(MBH) | (inches) |
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75 - 175 | 4 |
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200 - 400 | 6 |
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Installing Exhaust Vent Pipe
Install the vent pipe with a minimum downward slope (from the unit) of
The minimum vent length is 5 feet for horizontal and 10 feet for vertical. The maximum vent length is 70 feet. The total equivalent vent length must include elbows. The equivalent length of a 4 inch elbow is 6 feet and the equivalent length of a 6 inch elbow is 10 feet. Attach the vent terminal to the end of the exhaust pipe.
Vent | Minimum | Maximum |
Length | (feet) | (feet) |
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Horizontal | 5 | 70 |
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Vertical | 10 | 70 |
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A = 12 inch minimum
B = 12 inch minimum, but should size according to expected snow depth
B
Roof Line
EXHAUST
A
Exhaust Vent
Terminal
Air Inlet
Standard Indoor Venting - Vertical
®
Model IG / IGX
