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Section 3. Installation Instructions
COMBUSTION AIR SUPPLY
For indoor installation, the heater location must provide sufficient air supply for proper combustion and ventilation of the
surrounding area.
The minimum requirements for the air supply specify that the room in which a heater is installed should be provided with
two permanent air supply openings; one within 12 inches (30 cm) of the ceiling, the other within 12 inches (30 cm) of the
floor for combustion air, in accordance with the latest edition of ANSI Z223.1, or the National Fuel Gas code, the CSA
B149.1, Natural Gas and Propane Installation Codes, as applicable, and any local codes that may apply. These openings
shall directly, or through duct, connect to outdoor air.
Note: For indoor installations where combustion air might be insufficient, see "Direct Air Intake Duct
with 3-inch PVC Pipe (Indoor Installation)" below.
Direct Air Intake Duct with 3-inch PVC Pipe (Indoor Installation)
For indoor heater installations where combustion air supply might be insufficient, the MasterTemp
a direct air intake duct using 3-inch PVC pipe. If outside air is drawn through 3" PVC duct directly into the heater, PVC
pipe can be installed in accordance with the following requirements:
The air intake opening MUST be installed at least 1 ft. above the roof line or normal snow levels for free air flow. The
Category I or III exhaust vent termination cap must have at least 3 ft. minimum vertical clearance from air intake duct.
(See diagram on page 20).
Rev. N 10/2018
Air Supply Requirements Guide
for MasterTemp Heaters
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MASTERTEMP Pool and Spa Heater Installation and User's Guide
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Table 4.
®
Heater is certified for
19
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