Pentair ETi 400 - Combustion Air Supply Requirements; Indoor Air Supply Needs; Corrosive Fumes Warning

ETi 400 High Efficiency Pool and Spa Heater Installation and User’s Guide Rev. C 4/2017
28
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.
Section 2: Installation Instructions
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
®
400 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 400
400 in
2
2580 cm
2
400 in
2
2580 cm
2
100 in
2
645 cm
2
100 in
2
645 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 29 and 30.
Table 3. Note (*) Area indicated is for one of two openings; one at floor level
and one at the ceiling.