Munchkin HIGH EFFICIENCY HEATER with the "925" Controller - Manual (Page 14)

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VENTING
PART 4. VENTING
A. APPROVED VENTING MATERIALS
Exhaust Vent and Extensions in Plastic 2", 3" and 4" Pipe Schedule 40 or 80.
1. Non Foam Core PVC Pipe
2. Non Foam Core CPVC Pipe
3. Non Foam Core ABS Pipe
Vent Piping must conform to following
1. PVC Non Foam Core Pipe (Polyvinyl Chloride) to ASTM D-1785 or D-1784 Class 12454-B,
Formerly designated Type 1, Grade 1.
2. CPVC (Chlorinated Polyvinyl Chloride) Class 23447-B, Formerly designated Type IV, Grade 1 con-
forming to ASTM D-1784.
3. ABS (Acrylonitrile-Butadiene-Styrene) Class 3-2-2-2-2 conforming to ASTM D3965.
The Munchkin is a direct vent appliance. The Munchkin is listed as a Category
IV Condensing Appliance. (The Munchkin Venting is rated at Zero Clearance
to combustibles.)
Note: For Concrete construction or to meet certain fire codes, exhaust and inlet piping at the wall
penetration to the Munchkin must be CPVC Schedule 40 or 80 to meet local fire codes. The balance
from the penetrated wall to the outside, may be PVC Schedule 40 or 80.
Inlet Air Vent
Use the same material as used for exhaust in either 2", 3" or 4" Plastic Pipe. Cellular Foam Core Pipe
may be used for the inlet only, NEVER ON EXHAUST PIPING!
DANGER
It is extremely important to follow these venting instructions carefully. Failure to do
so can cause severe personal injury, death or substantial property damage.
DANGER
Foam Core Pipe is not to be used in connecting the exhaust pipe.
WARNING
This vent system will operate with a positive pressure in the vent pipe. Do not
connect vent connectors serving appliances by natural draft into any portion of
mechanical draft systems operating under positive pressure.