Rheem 90RJ Series - Page 27

FIGURE 23
TWO FURNACE VENTING THROUGH ROOF
8"
MINIMUM 12" ABOVE AVERAGE
SNOW ACCUMULATION. MAXIMUM
OF 24 IN. ABOVE ROOF.
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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.
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 23 and 24 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 24
TWO FURNACE VENTING THROUGH WALL
EXHAUST VENT
MODELS 06-07
TO BE REDUCED TO
1-1/2” PVC LAST 12”.
3” MINIMUM
24” MAXIMUM
3” MINIMUM
24” MAXIMUM
8” MINIMUM
24” MAXIMUM
8” MINIMUM
24” MAXIMUM
TWO-PIPE VENTING
CONCENTRIC VENTING
SEE CONCENTRIC
VENT SECTION
ON PAGE 23
FOR MORE
INFORMATION.
TWO-PIPE VENTING
CONCENTRIC VENTING
8"
MAXIMUM 1"
DISTANCE
FROM WALL
MINIMUM 12"
ABOVE GRADE
6' MINIMUM
10' RECOMMENDED
SEE CONCENTRIC VENT SECTION
ON PAGE 23 FOR MORE INFORMATION.