Rheem GF901U Series Installation Instructions Manual page 34

FIGURE 26
TWO FURNACE VENTING THROUGH ROOF
TWO-PIPE VENTING
CONCENTRIC VENTING
MINIMUM 12" ABOVE AVERAGE
SNOW ACCUMULATION. MAXIMUM
OF 24 IN. ABOVE ROOF.
8. Painted surfaces must be sound
and in good condition with no
cracking, peeling, etc. Painted
surfaces will require
maintenance.
9. Do not expose 3" x 2" reducer/
bushing to outdoor ambient
temperatures.
34
EXHAUST VENT
MODELS 06-07
TO BE REDUCED TO
1-1/2" PVC LAST 12".
3" MINIMUM
24" MAXIMUM
8" MINIMUM
24" MAXIMUM
8"
SEE CONCENTRIC
VENT SECTION
ON PAGE 23
FOR MORE
INFORMATION.
MULTIVENTING
IF VENTING TWO OR MORE
FURNACES NEAR EACH OTHER IS
REQUIRED, EACH FURNACE MUST
BE INDIVIDUALLY VENTED – NO
COMMON VENTING IS PERMITTED.
See Figures 26 and 27 for positioning
of the terminations. When more than
two furnaces are to be vented, there
must be at least 4 feet between the
first two furnaces and the third, etc.
FIGURE 27
TWO FURNACE VENTING THROUGH WALL
TWO-PIPE VENTING
3" MINIMUM
24" MAXIMUM
CONCENTRIC VENTING
6' MINIMUM
10' RECOMMENDED
MINIMUM 12"
ABOVE GRADE
MAXIMUM 1"
DISTANCE
FROM WALL
8"
8" MINIMUM
24" MAXIMUM
NOTE: Measurements apply to both
RXGY-E03 and RXGY-G01