4 Rheem Manufacturing Company
DOWNFLOW DIMENSIONS
TABLE 1. DIMENSIONS AND CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES) [mm]
NOTES: ➀ May require a 3" [76 mm] to 4" [102 mm] or 3" [76 mm] to 5" [127 mm] adapter.
➁ May be 0" [0 mm] with type B vent.
➂ May be 1" [25 mm] with type B vent.
Furnaces must be vented in accordance with ANSI Z21.47-1993 • CAN/CGA-2.3-M93 venting table guidelines, and in accordance with local codes.
[ ] Designates Metric Conversions