VERTICAL CHIMNEY’S

The chimney that this unit is connected to (Class “L”, all fuel or masonry) should extend above the roofline of adjacent buildings to prevent downdraft situations.

1.Class “L” connectors shall be installed without any downward pitch from the appliances and without any dips or sags.

2.Class “L” connectors shall be pitched upward from the appliance at least ¼” per foot.

3.Class “L” starter adapter shall be firmly attached to the vent outlet collar of the furnace and a positive seal made with high temp silicone, approved metal tape and/or sheet metal screws.

4.The chimney shall extend at least three (3) feet above the highest point when they pass through the roof of the building and at least two (2) feet higher than any portion of any building within ten (10) feet.

HIGH BUILDING OR

SECTION OF BUILDING

COMBUSTION AIR:

Furnaces must have air (oxygen) for proper performance. The incomplete combustion that takes place when a furnace is “air starved” causes carbon monoxide (CO) to be formed in quantities that can be dangerous inside a well-sealed house. Having a source of combustion air from outside prevents this “air starvation” of the furnace. Provisions for combustion air shall be made in accordance with applicable provisions of local building codes. The GBU070 combustion air intake is the slot on the back of the unit. Keep this opening free of obstructions which would restrict airflow.

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