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8
© 2021 United States Stove Company
2" MIN.
AIRSPACE
REQUIRED
BY CODE
CENTRAL
FURNACE
F
PLENUM
TO
CEILING
18"
18"
6" BAROMETRIC
DRAFT REGULATOR
NON-COMBUSTIBLE
FLOOR
12"
9"
48"
18"
CENTRAL
FURNACE
6" CHIMNEY
21"
18"
18"
6" BAROMETRIC
DRAFT REGULATOR
NON-COMBUSTIBLE
FLOOR
12"
9"
48"
18"
CENTRAL
FURNACE
6" CHIMNEY
21"
LISTED FACTORY BUILT CHIMNEY
Carefully follow chimney manufacturer's instructions.
Use only a Listed Residential Type or Building Heating
Appliance Chimney. If your chimney starts at the ceiling,
you will need enough 6" pipe to reach the ceiling. The top
of the chimney must be at least 3 feet above the roof and
be at least 2 feet higher than any point of the roof within
10 feet.
IMPORTANCE OF PROPER DRAFT
Draft is the force which moves air from the appliance
up through the chimney. The amount of draft in your
chimney depends on the length of the chimney, local
geography, nearby obstructions and other factors. Too
much draft may cause excessive temperatures in the
appliance. Inadequate draft may cause backpung into
the room and ‘plugging’ of the chimney. Inadequate draft
will cause the appliance to leak smoke into the room
through appliance and chimney connector joints. An
uncontrollable burn or excessive temperature indicates
excessive draft. Take into account the chimney’s location
to ensure it is not too close to neighbors or in a valley
which may cause unhealthy or nuisance conditions.
MASONRY CHIMNEY
CAUTION:
BE SURE THAT IF A MASONRY CHIMNEY IS
USED, IT IS SAFELY CONSTRUCTED AND IN GOOD
REPAIR. HAVE THE CHIMNEY INSPECTED BY THE
FIRE DEPARTMENT OR AN INSPECTOR.
Ensure that a masonry chimney meets the minimum
standards of the National Fire Protection Association
(NFPA) by having it inspected by a professional. Make
sure there are no cracks, loose mortar or other signs of
deterioration and blockage. Have the chimney cleaned
before the furnace is installed and operated. When
connecting the furnace through a combustible wall to
a masonry chimney, special methods are needed as
INSTALLATION
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