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CAUTION: Combustion air must not be taken from inside structure because inside air is frequently contaminated by
halogens, which include fluorides, chlorides, bromides, and iodides. These elements are found in aerosols, detergents,
bleaches, cleaning solvents, salts, air fresheners, adhesives, paint, and other household products. Locate combustion-air
inlet as far as possible from swimming pool and swimming pool pump house. Excessive exposure to contaminated
combustion air will result in safety and performance related problems
WARNING: Solvent cements are combustible. Keep away from heat, sparks, and open flame. Use only in well
ventilated areas. Avoid breathing in vapor or allowing contact with skin or eyes. Failure to follow this warning could result
in fire, property damage, personal injury, or death.
WARNING: All combustion-air and vent pipes must be airtight and watertight. Pipes must also terminate exactly as
shown in Fig. 39, 40, 41, 42, or 43. Failure to follow this warning could result in property damage, personal injury, or death.
NOTE: The minimum combustion-air and vent pipe length (each) for these furnaces is 5 ft. Short pipe lengths (5-8 ft) may discharge water
droplets. These droplets may be undesirable, and a 12-in. minimum offset pipe section is recommended, as shown in Fig. 37, to reduce excessive
droplets from exiting vent pipe outlet.
COMBUSTION-AIR AND VENT PIPE DIAMETER
Determine combustion-air and vent pipe diameter.
1. Using Table 7, individually determine the smallest combustion-air and vent pipe diameters allowed for each pipe. Pick the larger of these
2 pipe diameters and use this diameter for both combustion-air and vent pipes.
2. When installing vent systems of short pipe length, use the smallest allowable pipe diameter. Do not use pipe size greater than required or
incomplete combustion, flame disturbance, or flame sense lockout may occur.
Fig. 37—Short Vent (5 to 8 ft) System
A96230
HORIZONTAL TO ROOF HORIZONTAL TO SIDEWALL
VERTICAL TO SIDEWALLVERTICAL TO ROOF
VENT PIPE
COMBUSTION-AIR PIPE COMBUSTION-AIR PIPE
VENT PIPE
COMBUSTION-AIR PIPE
VENT PIPE
COMBUSTION-AIR PIPE
VENT PIPE
12″ MIN
12″ MIN
12″ MIN
(304.8mm)
12″ MIN
(304.8mm)
NOTE: A 12-in. (304.8mm) minimum offset pipe section is recommended
with short (5 to 8 ft / 1.5 to 2.5M) vent systems. This recommendation
is to reduce excessive condensate droplets.
(305mm)
(305mm)
—33—