Carrier F96VTN - Venting System Length Calculations; Example 1

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Specifications subject to change without notice.
Table 17 – Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (USA Installations)
MATERIALS
USA
1.
A
ll pipe, fittings, primers*, and solvents* must conform to
A
merican National Standards Institute (ANSI) standards and
American Society for Testing and Materials (ASTM) standards or ULC S636 where required by code.
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.
CANADA
1. Installation in Canada must conform to the requirements o
f
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.
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 Description
Type
A
STM or ULC Specification
Pipe Solvents/Primers** Cements
PVC
Pressure Pipe Schedule 40 D1785
D2466
or
D2665
F656 D2564
DW
V
Schedule 40 D1785/D2665
Cellular Core Schedule 40 F891
SDR 26 N/A D2241
SDR 21 N/A D2241
IPE
X
Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
Royal Pipe Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
ABS
A
BS Schedule 40 D1527 D2468
Clear Cleaner For ABS†
D2235
DW
V
-- I P S S i z e s Schedule 40 D2661 D2661
Cellular Core DW
V
-- I P S S i z e s Schedule 40 F628
CPVC
Pressure Pipe Schedule 40 F441 F438 F656 F493
SDR N/A F442 N/A
IPE
X
Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
Royal Pipe Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
*
PVC and
A
BS pipe may use either DW
V
or pressure rated
f
ittings.
*
*Colored or tinted solvents or primers must be used where required by code in the USA
†
A
BS plastic does not require a primer before solvent cementing.
A
cleaner
f
or
A
BS is recommended to remove any surface residue.
A
BS
cleaners are not subject to ASTM standards.
Polypropylene
A
pproved Manufacturer Solvents Primers Cements
Poly Pro
®
M&GDura
V
ent Not Permitted
NOTE: Polypropylene vent systems are U
L
− 1738 and ULC S636 listed and assembled using mechanical
f
astening systems supplied by the
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
70
f
t.
(22 M)
Use length of the longer of the vent
or air inlet piping system
A
dd equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
3
x
3
f
t.
(0.9 M)
=
9
f
t.
(2.7 M)
From Table 14
A
dd equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
2
x
1.5
f
t.
(0.5 M)
=
3
f
t.
(0.9 M)
From Table 14
A
dd equiv length of factory concentric vent term 0
f
t.
From Table 14
A
dd correction for flexible vent pipe, if any 0
f
t.
From
V
ent Manufacturer’s
instructions; zero for PVC/ABS DWV
Total Equivalent Vent Length (TEVL)
82
f
t.
(25 M)
A
dd all of the above lines
Maximum Equivalent Vent Length (MEVL)
95
f
t.
(29 M)
For 2” pipe from Table 13
Is TEVL less than MEVL? YES Therefore, 2” pipe MAY be used