Table of Contents
Advertisement
Table 17 – Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (USA Installations)
1. All pipe, fittings, primers*, and solvents* must conform to American National Standards Institute (ANSI) standards and
American Society for Testing and Materials (ASTM) standards or ULC S636 where required by code.
USA
2. See Table below for approved materials for use in the U.S.A.
3. ULC S636 vent systems must be composed of pipe, fittings, cements, and primers from the same supplier.
4. Factory accessory concentric vent kits are ULC S636 listed.
1. Installation in Canada must conform to the requirements of CAN/CSA B149 code.
2. Vent systems must be composed of pipe, fittings, cements, and primers from the same supplier and listed to ULC S636.
3. Not all materials below may be approved or listed to ULC S636.
CANADA
4. Royal Pipe and IPEX are approved suppliers of ULC S636 pipe, fittings, cements and primers*.
5. Factory accessory concentric vent kits are ULC S636 listed for use with Royal Pipe and IPEX venting systems
Material
PVC
ABS
Cellular Core DWV- -IPS Sizes
CPVC
*PVC and ABS pipe may use either DWV or pressure rated fittings.
**Colored or tinted solvents or primers must be used where required by code in the USA
†ABS plastic does not require a primer before solvent cementing. A cleaner for ABS is recommended to remove any surface residue. ABS
cleaners are not subject to ASTM standards.
Polypropylene
Poly Pro®
NOTE: Polypropylene vent systems are UL
vent manufacturer.
Venting System Length Calculations
The Total Equivalent Vent Length (TEVL) for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent
length of elbows used in the venting system from Table 14.
Standard vent terminations or factory accessory concentric vent terminations count for zero deduction.
See vent system manufacturer's data for equivalent lengths of flexible vent pipe or other termination systems. DO NOT ASSUME that one
foot of flexible vent pipe equals one foot of straight PVC/ABS DWV vent pipe.
Compare the Total Equivalent Vent Length to the Maximum Equivalent Vent Lengths in Table 13.
Example 1
A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE:
70 feet (22 M) of vent pipe, 65 feet (20 M) of combustion air inlet pipe, (3) 90º long-radius elbows, (2) 45º long-radius elbows, and a factory
accessory concentric vent kit.
Can this application use 2" (50 mm ND) PVC/ABS DWV vent piping?
Measure the required linear length of air inlet and
vent pipe; insert the longest of the two here
Add equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of factory concentric vent term
Add correction for flexible vent pipe, if any
Total Equivalent Vent Length (TEVL)
Maximum Equivalent Vent Length (MEVL)
Is TEVL less than MEVL?
Type
Description
Pressure Pipe
Schedule 40
DWV
Schedule 40
Cellular Core
Schedule 40
SDR 26
SDR 21
IPEX
Schedule 40
Royal Pipe
Schedule 40
ABS
Schedule 40
DWV- -IPS Sizes
Schedule 40
Schedule 40
Pressure Pipe
Schedule 40
SDR
IPEX
Schedule 40
Royal Pipe
Schedule 40
Approved Manufacturer
M & G Dura Vent
1738 and ULC S636 listed and assembled using mechanical fastening systems supplied by the
−
3
2
MATERIALS
ASTM or ULC Specification
Pipe
D1785
D1785/D2665
F891
N/A
D2241
N/A
D2241
ULC S636
ULC S636
ULC S636
ULC S636
D1527
D2661
F628
F441
N/A
F442
ULC S636
ULC S636
ULC S636
ULC S636
70 ft.
(22 M)
3 ft.
9 ft.
x
=
(0.9 M)
(2.7 M)
1.5 ft.
3 ft.
x
=
(0.5 M)
(0.9 M)
0 ft.
0 ft.
82 ft.
(25 M)
95 ft.
(29 M)
YES
55
Solvents/Primers**
D2466
or
F656
D2665
ULC S636
ULC S636
D2468
Clear Cleaner For ABS†
D2661
F438
F656
N/A
ULC S636
ULC S636
Solvents Primers
Not Permitted
Use length of the longer of the vent
or air inlet piping system
From
Table
14
From
Table
14
Table
From
14
From Vent Manufacturer's
instructions; zero for PVC/ABS DWV
Add all of the above lines
For 2" pipe from
Table
13
Therefore, 2" pipe MAY be used
Cements
D2564
ULC S636
ULC S636
D2235
F493
ULC S636
ULC S636
Cements
Advertisement
Table of Contents
