Rheem 801S Series Installation Instructions Manual page 21

Upflow/horizontal single stage gas furnaces
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COMBUSTION AND VENTILATION AIR (cont.)
FIGURE 17
FRESH AIR INLET
1. STANDARD 3" FLUE CONNECTION.
2. 4" ADAPTER - OPTIONAL
SEE NATIONAL FUEL GAS CODE FOR SIZING OPTIONS
FIGURE 18
DEDICATED VENTING THROUGH
CHIMNEY WITH "B-1" VENT
1.
2.
ST-A1220-09-01
ST-A1220-09
21

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