Specifications

8
Materials
■ All pipe, fittings, primer, and solvent cement must conform
with American National Standard Institute and the American
Society for Testing and Materials (ANSI/ASTM) standards.
The solvent shall be free flowing and contain no lumps,
undissolved particles, or any foreign matter that adversely
affects the joint strength or chemical resistance of the
cement. The cement shall show no gelatinization,
stratification, or separation that cannot be removed by
stirring. See “Piping and Fitting Specifications” for approved
piping and fitting materials.
Piping and Fitting Specifications
■ The primers and solvents used must also meet ASTM
specifications. PVC primer is specified in ASTM F656. Use
PVC solvent as specified in ASTM D2564 and ABS solvent
cement as specified ASTM D2235. Low temperature solvent
cement is recommended. Metal or plastic strapping may be
used for vent pipe hangers.
■ When making ABS joints, pieces can be prepared with a
cleaner. When joining ABS to PVC materials, use PVC solvent
cement as specified in ASTM D3138.
■ Preferred fittings are DWV style or long sweep. Seal all joints
gas tight with appropriate cement. In areas where vent and air
intake pipes are exposed to abnormal stress or are subject to
damage, schedule 80 pipe should be used.
■ Use high temperature RTV silicone sealant to attach the air
intake pipe into the connector on the burner box so the air
intake pipe can be removed if service is required.
NOTE: Do not use cement.
Vent Pipe Size and Length
The vent pipe and air intake pipe (in direct vent installations)
should be sized in accordance with the information found in the
“Vent Tables.” One 90° elbow is equivalent to 5 ft of pipe.Two 45°
elbows are equivalent to one 90° elbow.The minimum length
certified for use with this furnace is 5 ft and one elbow, not
including the vent and air intake terminals.
Vent Table - 40,000 - 80,000 BTU/HR Models
Vent Table- 90,000 - 100,000 BTU/HR Models
Piping and Fitting Material ASTM Specification
Schedule 40 PVC (Pipe) D1785
Schedule 40 PVC (Cellular Core Pipe) F891
Schedule 40 PVC (Fittings) D2466
SDR-26 (Pipe) D2241
Schedule 40 ABS (Pipe) D1527
Schedule 40 ABS (Fittings) D2468
Schedule 40 & 80 CPVC (Pipe) F441
ABS-DWV Drain Waste & Vent
(Pipe & Fittings)
D2661
PVC-DWV Drain Waste & Vent
(Pipe & Fittings)
D2665
Vent Pipe
Length (ft)
Minimum Pipe Diameter (in.)
5 1.51.522222222
10 1.5222222222
20 2222222222.5
30 22222222.52.52.5
40 2 2 2 2 2 2.5 2.5 2.5 2.5 2.5
50 2 2 2.5 2.5 2.5 2.5 2.5 2.5 2.5 NR
60 2 2.5 2.5 2.5 2.5 2.5 2.5 NR NR NR
70 2.5 2.5 2.5 2.5 2.5 NR NR NR NR NR
80 2.52.52.5NRNRNRNRNRNRNR
90 2.5 2.5 NR NR NR NR NR NR NR NR
Number of 90°
Elbows
0 123456789
NR = Not Recommended
Vent Pipe
Length (ft)
Minimum Pipe Diameter (in.)
5 NR2222222.52.52.5
10 2222222.52.52.52.5
20 2 2 2 2 2 2.5 2.5 2.5 2.5 3
30 2 2 2 2.5 2.5 2.5 2.5 3 3 3
40 2 2 2.5 2.5 2.5 3 3 3 3 3
50 2.52.52.5333333NR
60 2.5333333NRNRNR
70 3 3 3 3 3 NRNRNRNRNR
80 3 3 3 NRNRNRNRNRNRNR
90 3 3 NR NR NR NR NR NR NR NR
Number of 90°
Elbows
0 123456789
NR = Not Recommended