Vent And Combustion Air Pipe Lengths - Bosch KBR16-3 Installation And Service Instructions Manual

X
Y
1
Fig. 39 Vertical venting system (sealed combustion)
[1] Intake
[2] Exhaust
X Greater than 12 inches (305 mm)
Y 12 inches (305 mm) above maximum snow level or at least
24 inches (610 mm) whichever is greater
The transitions from rigid to corrugated pipe must
conform to the S636 standard - Plastic vent pipe for gas
fired appliances
1 2
Fig. 40 PolyPro Flex Chimney Cap (PP) vertical venting system (sealed
combustion)
[1] Intake
[2] Exhaust
Greenstar FS
X
2
6 720 810 590-26.1Wo
6 720 806 922-08.2O
X
Y
Fig. 41 Horizontal venting system (telescopic concentric vent kit)
6.8.3

Vent and combustion air pipe lengths

With Flex pipe the maximum length is reduced by 50%
Flex pipe according to the suppliers instructions for use
in the vertical part of the installation only.
3" (76 mm) Vent and combustion air pipe
For all installation situations and for all appliances the maximum vent
and combustion air pipe length is 100 feet each, with no more than
8 elbows each.
2" (50 mm) Vent and combustion air pipe
The maximum combined vent and combustion air pipe length
( tab. 11, 12 and 13) depend on the installation situation, the
appliance type and the number of elbows used.
Installations  Fig. 32, 33, 34, 36, 37 and 39
Separate terminations
2" PIPE Maximum effective vent pipe length allowed for
Number of 90°
elbows used
1
2
3
4
5
6
Table 11 Vent and combustion air pipe lengths with 2" diameter and
separate terminations
Installation | 43
5/8" per foot
(52 mm per metre)
6 720 810 590-27.1Wo
Ø 2" pipe
KBR16-3 KBR35-3
KBR21-3 KWB35-3
KBR28-3 KBR42-3
KWB28-3 KWB42-3
81 ft (24.6 m) 65 ft (19.8 m)
76 ft (23.1 m) 57 ft (17.3 m)
71 ft (21.6 m) 48 ft (14.6 m)
66 ft (20.1 m) 40 ft (12.2 m)
61 ft (18.6 m) 32 ft (9.8 m)
56 ft (17.1 m) 23 ft (7.0 m)
6 720 810 590 (2015/05)