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