Manuals / Thermo Products / Household Appliance / Furnace

Thermo Products CMC1-75D36N H. Direct Venting Through a Sidewall, Vent And Combustion Air Pipes

Models: CMC1-75DV3N CMA3-75D36N CMA3-50D36N CMC1-75D36N CMC1-50D36N CMC1-50DV3N

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H. Direct Venting Through a Sidewall

All installations and services must be performed by qualified service personnel.

gas flame. Should acid compounds form in your furnace, it may reduce the life of the furnace.

H. Direct Venting Through a Sidewall

1. Vent And Combustion Air Pipes

Vent and combustion air pipes may pass through a maximum wall thickness of 18 inches. The minimum wall thickness is 2 inches. Referring to Figure 7, the maximum distance from the outer wall to the center of the elbow is 12 inches.

Figure 7: Proper Direct Vent Terminations (RH & LH views) and Vent

Termination Only w/o Outside Combustion Air Intake (RH view)

NOTICE: If exterior sidewall building materials are subject to degradation from contact with flue gases or moisture, a minimum 24-inch diameter shield shall be fabricated from stainless steel or UV-resistant plastic sheet. The protective shield shall be installed around the vent pipe on the outside wall.

2. Exhaust Vent Termination Elbow

The exhaust vent termination elbow shall be installed in accordance with these instructions and any applicable local codes. Refer to Figures 7 and 8 for typical examples of proper terminations.

a. The exhaust vent termination must be installed in the same atmospheric pressure zone (i.e. on the same wall) as the air intake termination.

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Thermo Products CMC1-75D36N, CMC1-50DV3N, CMC1-50D36N H. Direct Venting Through a Sidewall, Vent And Combustion Air Pipes
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FAQ

Who should perform installations and services for Thermo Products furnaces?

All installations and services must be performed by qualified service personnel.

What is the maximum and minimum wall thickness for vent and combustion air pipes?

Vent and combustion air pipes may pass through a maximum wall thickness of 18 inches, with a minimum of 2 inches.

What material should be used for a protective shield around the vent pipe on the outside wall?

If exterior sidewall building materials are subject to degradation from contact with flue gases or moisture, a minimum 24-inch diameter shield shall be fabricated from stainless steel or UV-resistant plastic sheet.