507276-05C Page 17 of 57mrcool.com
Figure 22.
CHIMNEY
OR GAS
VENT
(Check sizing
for remaining
appliance)
FURNACE
(Removed from
from common
vent system)
WATER
HEATER
OPENINGS
(To Adjacent
Room)
If this gas furnace replaces a furnace which
was commonly vented with another gas appliance,
the size of the existing vent pipe for that gas
appliance must be checked. Without the heat of the
original furnace flue products, the existing vent pipe
is probably oversized for the single water heater or
other appliance. The vent should be checked for
proper draw with the remaining appliance.
REPLACING FURNACE THAT
WAS PART OF A COMMON
VENT SYSTEM
Exhaust Piping
CAUTION
CAUTION
Vent Piping Guidelines
NOTE: In non-Direct Vent installations, combustion air is
In Direct Vent installations, combustion air is taken from
NOTE:
NOTE:
Figure 23.
MRCOOL, LLC
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