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5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Single Pipe Venting (Room Air Dependent)
Vent Length Requirements
(continued)
Maximum vent pipe length - vertical
All PP(s) vent material and air intake (if PP(s) used) must
be ULC S636 or UL 1738 listed, manufactured by M&G /
DuraVent or Centrotherm InnoFlue.
Size the exhaust vent pipe as specified in table below This
table lists the maximum allowable vent length in feet and
meters of the exhaust piping. Vent diameter must not be
reduced at any point in the installation.
For PP(s) systems, all exhaust vent and air intake piping
and elbows exposed outside, must be UV resistant
polypropylene (supplied by the vent manufacturer).
IMPORTANT
Maximum allowable equivalent length - vertical
Boiler Model
System Ø
Max. equivalent vent length ”a”
*
3
WB1B 26, 35
2 in. (51 mm)*
1
3 in. (76 mm)*
2
4 in. (102 mm)*
2
86 ft. (31 m)
164 ft. (50 m)
200 ft. (61 m)
WB2B 19, 26, 35, B2HA 19, 28, 35, B2TA 19, 35
B2HB 19, 26, 35, B2TB 19, 35
2 in. (51 mm)*
1
3 in. (76 mm)*
2
4 in. (102 mm)*
2
115 ft. (35 m)
148 ft. (45 m)
180 ft. (55 m)
WB2B 45, 60, B2HA 45, 60, B2HB 45, 57
3 in. (76 mm)
4 in. (102 mm)*
2
98 ft. (30 m)
148 ft. (45 m)
WB2B 80, 105, B2HA 80, 88, 100, 112,
4 in. (102 mm)
131 ft. (40 m)
B2HA 150
4 in. (100 mm)*
4
5 in. (125 mm)*
5
131 ft. (40 m)
131 ft. (40 m)
Legend
A
Exhaust (straight coupling) with screen
B
Flashings
C
Support system
D
Combustion air intake (left, right or through co-axial
opening), remove and discard air intake cover
(WB1B 26, 35, B2TA 19, 35, B2TB 19, 35,
WB2B 19, 26, 35, B2HA 19, 28, 35, B2HB 19, 26, 35)
E
Combustion air opening
a Equivalent length (exhaust)
b min. 18 in. (457 mm)
max. 48 in. (1219 mm)
*1
2 in. diameter system only available with CPVC / PP(s) systems
*2
4 in. (3 in. to 4 in. increaser field supplied).
*3
See illustration below.
*
4
Due to higher exhaust vent pipe resistance, there is an automatic input reduction of 9% for model B2HA 150
when a 4 inch diameter vent pipe is used.
E
D
D
C
a
B
A
b
*
5
4 in. to 5 in. increaser field supplied.
Minimum vent length is 3.3 ft. (1 m.)