Pentair ETi 250 - Combustion Air Supply; Air Supply Requirements Guide for the Eti 250 Heater

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
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COMBUSTION AIR SUPPLY
For indoor installation, the heater location must provide sufcient air supply for proper combustion and ventilation of the
surrounding area, see Table 3 below.
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 in (30 cm) of the oor
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.
CAUTION
Chemicals should not be stored near the
heater installation. Combustion air can be
contaminated by corrosive chemical fumes
which can void the warranty.
NOTE *: Vent must be at least 2.4 m (8 ft) away from
nearest vertical surface. Vents extending 1,5 m (5 ft) or
more above the roof must be braced or guyed. Consult
your local code officials for detailed information.
Air Supply Requirements Guide for the ETi 250 Heater
Minimum Net Free Open Area for Each Opening*
(Square Inches / Square Centimeters)
Model
All Air From Inside BuildingAll Air From Outside Building
Combustion Vent Combustion Vent
ETi 250
250 in
2
1613 cm
2
250 in
2
1613 cm
2
63 in
2
406 cm
2
63 in
2
406 cm
2
Note: For indoor installations where combustion air might be insufcient, see Direct Air Intake Duct with 4
in PVC Pipe (Indoor Installation) on page 32 and 33.
Table 3. Note (*) Area indicated is for one of two openings; one at floor level
and one at the ceiling.
Installation