Pentair ETi 400 - Page 29

Rev. C 4/2017 ETi 400 High Efficiency Pool and Spa Heater Installation and User’s Guide
29
Direct Air Intake Duct with 4-inch or 6-inch PVC Pipe (Indoor Installation)
For indoor heater installations, the heater is tested for a direct air intake duct using 4 in or 6 in PVC pipe. If outside air is
drawn through 4 in or 6 in PVC duct directly into the heater, vent pipe can be installed in accordance with the following
requirements, see Table 4 below.
The air intake opening MUST be installed at least 1 ft. above the roof line or normal snow levels for free air ow. The
Category IV exhaust vent termination cap must have at least 3 ft. (1 m) minimum vertical clearance from air intake duct,
see Figure 22.
Flue Exhaust Side
Wall Vent Cap
provided with heater
pro
vided with heater
Direct Air Intake kit
(P/N 475971)
Flue Exhaust Vent Cap
provided with heater
4” or 6” PVC Pipe
4” or 6” PVC Pipe
Combustion Air Intake (Vertical or Horizontal) Duct Requirements*
Figure 22.
No. of 90° Elbows 4-in (10 cm) pipe 6-in (15 cm) pipe
0 120 ft. (36.6 m) 300 ft. (91.4 m)
1 108 ft. (33 m) 288 ft. (87.7 m)
2 96 ft. (29.3 m) 276 ft. (84.1 m)
3 84 ft. (26 m) 264 ft. (80.4 m)
4 72 ft. (22 m) 252 ft. (76.8 m)
Table 4.
CAUTION
Do NOT combine exhaust vent pipes to a
common exhaust vent in multiple unit
installations. Run separate vent pipes.
Section 2: Installation Instructions
* Combustion Air Intake (Vertical or Horizontal)
Maximum length in Feet (m)