17
COMBUSTION AND VENTILATION AIR (cont.)
A. 1 Square inch for each 3,000 BTUH of the total input rat-
ing of all equipment located in the enclosure
and
B. Not less than the sum of the areas of all vent connectors
in the confined space.
If the unit is installed where there is an exhaust fan, sufficient
ventilation must be provided to prevent the exhaust fan from cre-
ating negative pressure.
AIR INTAKE PIPE CONNECTION
A double-elbow may be installed to top inlet air opening,
BUT IS NOT REQUIRED. This will help to prevent accidental
blockage of the intake opening. Reference Figure 14 for
proper elbow diameter.
NOTE:
Inlet is specifically designed to prevent material from
being pulled into furnace. If elbows are not used, the intake open-
ing must be kept clean and free of debris.
ATTACH OPTIONAL DOUBLE ELBOW TO TOP INLET AIR
OPENING TO PREVENT ACCIDENTAL BLOCKAGE OF
INTAKE OPENING. THIS IS NOT A REQUIREMENT. (SEE
PREVIOUS PAGE.) SINGLE ELBOW IS ALLOWED BUT
MAY NOT PREVENT DEBRIS FROM BEING DROPPED
INTO THE FURNACE.
GROUND OR
SHELF SURFACE
6" MIN.
6" MININUM
CLEARANCE
PVC
DOUBLE
ELBOW
#8 SCREWS
METAL FLUE
PIPE ONLY
EXHAUST
#8 SCREWS
FIGURE 13
COMBUSTION AIR FITTING – NON-ATTIC COMBUSTION AIR PULL
Co
m
bu
stio
n A
ir
OPTIONAL
INLET AIR 1 INCH
2
(6.5cm
2
)
PER 4000 BTUH
12”/31cm MAX.
OUTLET AIR IN ATTIC
MUST BE ABOVE INSULATION
1 INCH
2
(6.5cm
2
) PER
4000 BTUH OUTLET AIR
GABLE VENT
VENTILATED ATTIC GABLE
OR SOFFIT VENTS
S
OPTIONAL INLET AIR 1 INCH
2
(6.5cm
2
). PER 4000 BTUH
GAS
WATER
HEATER
GAS
FURNACE
VENT PENETRATIONS
FOR NON DIRECT VENT FURNACES
AIR FROM ATTIC/CRAWL SPACE
12”/31cm
MAX.
INLET AIR 1 IN
2
(6.5cm
2
) PER 2000 BTUH
GAS
WATER
HEATER
GAS
FURNACE
VENT PENETRATIONS
FOR NON DIRECT VENT FURNACES
OUTSIDE AIR USING A HORIZONTAL DUCT
OUTLET AIR 1 IN²
(6.5cm²) PER 2000 BTUH
S
OPTIONAL
ST-A1194-19
FIG H
ST-A1194-19
FIG G
FIGURE 11
NON-DIRECT VENT
AIR FROM ATTIC
OR CRAWL
SPACE
FIGURE 12
NON-DIRECT VENT
OUTSIDE AIR
USING A
HORIZONTAL
DUCT
COMBUSTION AIR REQUIREMENTS: CONFINED AND
UNCONFINED SPACES
Summary of Contents for 801P SERIES
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