All installations and services must be performed by qualified service personnel.
23
NOTICE: When the vent termination is installed correctly, a draft should NOT be present in
the system during the furnace off-cycle.
Figure 6: Typical Rooftop Vent and Air Intake Termination Construction Details
H. CONNECTING FURNACE TO VENT / INTAKE TERMINATIONS
1.
Figure 7A-D depict typical exhaust vent and air intake connections for the furnace model series
CLQS1, as well as a list of required parts to correctly install each system.
For the -100 & -125 models, which require 3-inch PVC pipe, there will still be a short section of
2-inch PVC pipe & fittings at the furnace, as the grommet and intake flange are both sized for 2-
inch. The length of 2-inch PVC pipe between the furnace cabinet and the 2-inch x 3-inch reducer
fitting must be kept to a minimum. The maximum length of that 2-inch PVC pipe should be 12
inches.
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