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CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage
the heater and void the warranty. (Refer to "Inside Air Contamination" on page 46.)
Water heaters located indoors must be installed in a protective enclosure or properly constructed plant
room.
The following materials may be used to supply air to the water heater: Stainless steel, galvanized steel,
PVC, ABS, CPVC. Refer to
The following procedure refers to Rheem supplied stainless steel flue components but the principles
apply to any flue system.
1. Install combustion air intake pipe in accordance with Fig. 20 (horizontal) or Fig. 21 (vertical) on page
51.
2. Remove the hood and screen assembly from the air intake before attaching any air duct. Attach the
air intake directly to the collar located on the inline Air Filter Box.
3. Fit the straight flue length and/or elbows to the adaptor and run to the air intake location, securing
each joint with the clamp.
4. Penetrations through the roof or wall shall use flashing to prevent water ingress to the building (not
supplied) and if extended above the roof more than 1.5m should be secured with guy wires or
braced.
5. The air intake must be terminated with a downward facing 90 degree elbow, the bottom of which
must be at least 300mm above grade. Refit the screen assembly with screws (not provided).
Alternatively, the air intake hood may be repositioned on the wall with the air intake pointing
downwards.
6. It is recommended that the air intake pipe be insulated to minimize sweating should this occur.
7. Install flueing according to the instructions supplied for
Horizontal Terminating Flues
WARNING: Air supply to the area where the water heater is installed must not be affected by
mechanical exhaust vents such as kitchen or bathroom fans, spa blowers, etc. Mechanical exhaust
vents may create a negative pressure in the area where the water heater is installed and can become
a hazard by asphyxiation, explosion or fire.
NOTE: Use of this heater in construction areas where fine particulate matter, such as concrete or dry-
wall dust, is present may result in damage to the heater that is not covered by the warranty. If operated
in a construction environment, a clean source of combustion air must be provided directly to the heater.
Table 17
on page 47 for diameters and lengths of air intake and flue.
on page 49.
Vertical Terminating Flues
50
on page 48 or
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