NTI VM110 - Vent;Air-Inlet Pipe Material; Vent;Air-Inlet Pipe Length Determination

General Venting │ Vmax I&O Manual
14
Vent/Air-inlet Pipe Material
Table 4-2 Approved Vent and Air-Inlet Pipe Material
Items
1
Materials
2, 3
Venting System Standards
All Vent and Air-Inlet
materials installed on gas
fired appliances in CAN/US
must meet the Standards
listed in this Table. Failure
to comply could result in
fire, serious injury or death.
United States
Canada
4
Vent Piping
and Fittings
PVC - DWV
ANSI/ASTM D2265
All venting material in
Canada must be
ULC S636 approved.
See Note 4 below for
appropriate temperature
applications.
PVC Schedule 40
ANSI/ASTM D1785
CPVC Schedule 40
ANSI/ASTM F441
Stainless Steel (SS)
UL-1738
Polypropylene (PP)
-
Pipe Cement
PVC
ANSI/ASTM D2564
CPVC
ANSI/ASTM F493
Primers
PVC / CPVC
ANSI/ASTM F656
Notes:
1
Refer to Table 4-5 for Allowable Vent and Air-inlet Pipe Sizes and Lengths.
2
PVC venting (exhaust and air-inlet) is not permitted within the Closet/alcove of a Closet/alcove installation.
3
The Air-inlet does not require high temperature pipe material. Check applicable local codes for acceptable materials.
4
ULC S636 PVC is approved for flue gas temperatures up to 149
o
F (65
o
C) and must only be used for low temperature
applications. High temperature applications requiring boiler supply water temperatures greater than 140
o
F (60
o
C) must
use ULC S636 CPVC, PP or SS.
The use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) in the exhaust venting system is prohibited. Failure to follow these
instructions may result in property damage, personal injury or death.
Covering non-metallic vent pipe and fittings with thermal insulation is prohibited. Failure
to follow these instructions may result in property damage, personal injury or death.
Vent/Air-inlet Pipe Length Determination
Use Table 4-3 to determine the maximum pipe length that can be used. The table calculates 90º elbows, and 45º
elbows at 5 equivalent feet each.
Example: When using 3 in. pipe, the Vmax can be installed with 150 equivalent feet of air-inlet piping and 150
equivalent feet of exhaust-vent piping. See Table 4-3 for more details.
Table 4-3 Allowable Vent and Air-inlet Pipe Size and Lengths
Pipe Size
Length (ft)
2
Number of Elbows (90’s or 45’s) and Equivalent Feet
1
2
3
4
5
6
7
8
9
2”
1
100
3
95
90
85
80
75
70
65
60
55
3”
150
145
140
135
130
125
120
115
110
105
Note:
1
See WARNING below.
2
Minimum length of each the exhaust vent and combustion air-inlet piping is 5 feet equivalent.
3
When using 2 in., the combustion air-inlet piping must not exceed the length of the exhaust vent piping by more than 25
equivalent feet.
PVC Exhaust Venting – When using 2 inch PVC venting, the first seven (7) equivalent
feet of exhaust venting must be approved 2 inch CPVC or 3 inch PVC; see exceptions in
Table 4-2.