Direct Air Intake Exhaust Duct Using 3-Inch Pvc Pipe (Indoor Installation) / Corrosive Vapors And Possible Causes - Pentair MASTERTEMP 125 Installation And User Manual

Figure 11.
Note (*): Combustion Air Intake Duct Connection Kit (Call 1.800.831.7133 for part number) for all MasterTemp
Heater models can be purchased separately. See page 52 for parts list.
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.
Corrosive Vapors and Possible Causes
Area
Chlorinated swimming
pools and spas
New construction and
remodeling areas
Table 5.
Rev. B 8/14
NOTE
Likely Contaminants
Pool or spa cleaning chemicals. Acids,
such as hydrochloric or muriatic acid.
Glues and cements, construction
adhesives, paints, varnishes, and
paint and varnish strippers. Waxes and
cleaners containing calcium or sodium
chloride.
MASTERTEMP
Section 3. Installation Instructions
Combustion 3 in. PVC Pipe
Inlet Air Intake Duct Requirements*
Combustion Air Intake 3 in. Pipe
(Vertical or Horizontal)
No. of 90° Elbows
0
1
2
3
4
Table 4.
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.
CAUTION
Chemicals should not be stored near the
heater installation. Combustion air can
be contaminated by corrosive chemical
fumes which can void the warranty.
® 125 Pool and Spa Heater Installation and User's Guide
19
®
Maximum Length in Feet (M)
70 ft. (21.3 M)
58 ft. (17.7 M)
46 ft. (14.0 M)
34 ft. (10.4 M)
22 ft. ( 6.7 M)
® 125