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Airflow from the supply fan should enter on the drum (or primary) side of the heat exchanger
(Figure
Figure 6. Entering airside (drum or primary) of gas heat
section
Rain Hood - Combustion Air Inlet
Rain hoods are only required on an outdoor unit with an internal vestibule. Depending on unit size,
the combustion air opening will be in the access door or in the side panel. A unit with an external
vestibule has the combustion air opening in the floor of the vestibule and does not require a rain
hood, unless excessive snowdrifts are expected.
Rain hoods for the combustion air opening ship loose and must be installed at the job site. The
assembly consists of the hood, butyl tape and number 10 screws.
•
•
•
Figure 8. Installation of rain hood for combustion air opening
CLCH-SVX08A-EN
6) and exit on the tube (or secondary) side
Install butyl tape between the hood and the side panel or door panel (see
Locate the bottom edge of the hood 2 3/8 inches below the bottom edge of the inlet air opening
and center the hood left-to-right over the inlet air opening (see
Install the hood to the unit with number 10 screws.
Butyl tape
Hood
(Figure
7).
Figure 7.
Leaving air side (tube or secondary) of gas heat
section
Figure 9. Center inlet air opening
Hinge
side
2 3/8 in.
Installation
Figure
8).
Figure
9).
Access door
Rain hood
Airflow
Combustion
air opening
Center hood left-to-right
over opening
17
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