Maximum Vent Pipe Length - Vertical - Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual

Vitodens Rigid and Flex Venting Systems Installation
Vent Length Requirements

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.
Maximum allowable equivalent length - vertical
Boiler Model
WB1B 26, 35
WB2B 19, 26, 35, B2HA 19, 28, 35, B2TA 19, 35
B2HB 19, 26, 35, B2TB 19, 35
WB2B 45, 60, B2HA 45, 60, B2HB 45, 57
WB2B 80, 105, B2HA 80, 88, 100, 112,
B2HA 150
*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.
* 5 4 in. to 5 in. increaser field supplied.
A
b
C
D
(continued)
B
a
D
E
Single Pipe Venting (Room Air Dependent)
IMPORTANT
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).
System Ø Max. equivalent vent length "a"*
2 in. (51 mm)* 1
3 in. (76 mm)* 2
4 in. (102 mm)* 2
2 in. (51 mm)* 1
3 in. (76 mm)* 2
4 in. (102 mm)* 2
3 in. (76 mm)
4 in. (102 mm)* 2
4 in. (102 mm)
4 in. (100 mm)* 4
5 in. (125 mm)* 5
Minimum vent length is 3.3 ft. (1 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)
3
86 ft. (31 m)
164 ft. (50 m)
200 ft. (61 m)
115 ft. (35 m)
148 ft. (45 m)
180 ft. (55 m)
98 ft. (30 m)
148 ft. (45 m)
131 ft. (40 m)
131 ft. (40 m)
131 ft. (40 m)
67