NTI Trinity Tft285 - Page 16

Trinity │Installation and Operation Instructions Tft Series
16
Vent/Air-inlet Pipe Material
Table 4-4 Acceptable 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 specifications
provided in this Table.
Failure to comply could
result in fire, serious injury
or death.
United States
Canada
Vent Piping
and Fittings
PVC - DWV
ANSI/ASTM D2265
In Canada, all exhaust
vent material must be
ULC S636 approved.
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; ABS and PVC Foam Core piping is acceptable. Check
applicable local codes for acceptable materials.
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 4-5 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” pipe, a Tft60-285 can be installed with 150 equivalent feet of air-inlet piping and 150
equivalent feet of exhaust-vent piping. See Table 4-5 for more details.
Models Tft60-110 require a minimum equivalent exhaust vent length of 15’. When
operating on Propane, models Tft60-110 require a minimum air-inlet length of 6’ and 11’
for 2” and 3” venting respectfully.
Table 4-5 Allowable Vent and Air-inlet Pipe Size and Lengths
Model No.
Pipe
Size
Gas
Length
(ft)
Number of Elbows (90’s or 45’s) and Equivalent Feet
1
2
3
4
5
6
7
8
9
Tft60-110
2”
1
NG
100
95
90
85
80
75
70
65
60
55
Tft60-85
LP
35
30
25
20
15
10
5
-
-
-
Tft110
25
20
15
10
5
-
-
-
-
-
Tft60-285
2
3”
NG/LP
150
145
140
135
130
125
120
115
110
105
Tft340-399
4”
100
95
90
85
80
75
70
65
60
55
Notes:
1
See WARNING below.
2
Maximum 3 in. vent lengths specified are not applicable to models Tft155, Tft175, Tft200 and Tft250; consult earlier
instruction manuals for maximum vent lengths for earlier models.
PVC Exhaust Venting – When using 2” PVC venting with models Tft60-110, the first
seven (7) equivalent feet of exhaust venting must be approved 2” CPVC or 3” PVC; see
exceptions in Table 4-4 and Figures 4-3b and 4-3d.