MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. N 10/2018
20
Corrosive Vapors and Possible Causes
Section 3. Installation Instructions
Table 6.
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NOTE
Each 90-degree elbow reduces the maximum horizontal PVC air intake duct run by 12 feet and each 45-
degree elbow in the PVC air intake duct run reduces the maximum run by 6 feet. See the Table 5 above for
the maximum lengths using 90-degree elbows.
CAUTION
Chemicals should not be stored near the
heater installation. Combustion air can
be contaminated by corrosive chemical
fumes which can void the warranty.
WARNING!
DO NOT USE PVC PIPE FOR FLUE
EXHAUST VENT. FLUE EXHAUST
VENT TEMPERATURES CAN BE IN
EXCESS OF 400° F. FLUE EXHAUST
VENT MUST BE CATEGORY I or
CATEGORY III METAL VENT.
Note (*): Combustion Air Intake Duct Connection Kit (Part Number 461031) for all MasterTemp heater models can be
purchased separately. See page 52 for parts list.
Combustion 3 in. PVC Pipe
Inlet Air Intake Duct Requirements*
Combustion Air Intake 3 in. Pipe
(Vertical or Horizontal)
No. of 90° Elbows Maximum Length in Feet (M)
0 70 ft. (21.3 M)
1 58 ft. (17.7 M)
2 46 ft. (14.0 M)
3 34 ft. (10.4 M)
4 22 ft. ( 6.7 M)
Table 5.
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