Rheem RGRK-12ERAJS Series Installation Instructions Manual page 30

FIGURE 23
TWO FURNACE VENTING THROUGH ROOF
TWO-PIPE VENTING
COMBUSTION
AIR INTAKE
2" PVC
CONCENTRIC VENTING
8" MIN.
24" MAX.
MINIMUM 12" ABOVE AVERAGE
SNOW ACCUMULATION. MAXIMUM
OF 24 IN. ABOVE ROOF.
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.
30
3" MIN.
24" MAX.
SEE CONCENTRIC
VENT INSTALLATION
INSTRUCTIONS
FIGURE 24
TWO FURNACE VENTING THROUGH WALL
TWO-PIPE VENTING
3" MIN.
24" MAX.
CONCENTRIC VENTING
6" MINIMUM
10" RECOMMENDED
MINIMUM 12"
ABOVE GRADE
MAXIMUM 1"
DISTANCE
FROM WALL
SEE CONCENTRIC VENT INSTALLATION
8" MIN.
INSTRUCTIONS.
24" MAX.
COMBUSTION
AIR INTAKE
2" PVC COUPLING
WITH VALVE IN
VERTICAL POSITION
EXHAUST VENT