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5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Direct Venting (Two-pipe System)
Vent Length Requirements
(continued)
Maximum vent/air intake pipe length - horizontal/vertical
(hybrid system)
(continued)
Standard Long Sweep Elbows
Note:
If standard sweep elbows are used the allowable
vent lengths are reduced.
One standard 90° elbow is equivalent to 8 ft. (2.4 m)
of straight pipe.
Standard long sweep elbows
Material
90° elbow equivalent length
ft. (m)
45° elbow equivalent length
ft. (m)
87° elbow / 87° inspection tee
ft. (m)
Stainless steel
3 (0.91)
2 (0.61)
-
CPVC plastic pipe
5 (1.52)
3 (0.91)
-
PP(s)
-
1 (0.30)
1.6 (0.50)
A
B
C
D
a
b
c
Flue
Air
For plastic pipe only
90° long sweep elbow
equivalent to 5 ft. (1.5 m)
90° short sweep elbow equivalent
to 8 ft. (2.4 m) (if used)
Vitodens 200-W WB2B 45, 60, 80, 105
Vitodens 200-W B2HA 45, 60, 80, 88, 100, 112, 150
Vitodens 200-W B2HB 45, 57
Legend
A
Support system
B
Flashings
C
Exhaust (straight coupling) with screen
D
Combustion air intake with screen
a Equivalent length (exhaust)
b Equivalent length (air intake)
c min. 18 in. (max. 48 in.)
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