Thermo Pride Gas/Propane Furnace Mobile Home CMC1 - Manual (Page 19)

All installations and services must be performed by qualified service personnel.
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C. ALCOVE INSTALLATION
In this application, a minimum of 18 inches of clearance must be provided to the
front of the unit. See Figure 4.
Note – access to diagnostic view port.
CMA3 SERIES CMC1 SERIES
Figure 4.
D. CLOSET INSTALLATION
1. The return air opening into the closet is to have a minimum free area of 250
sq. in. (see Figure 5).
2. The return air opening may be located in the top, center or (ideally) bottom of
the closet door or side wall.