Standard Long Sweep Elbows - Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual

Vitodens Rigid and Flex Venting Systems Installation
Vent Length Requirements
Maximum vent/air intake pipe length - horizontal/vertical
(hybrid system) (continued)
Flue
C
c
B
a
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

Standard Long Sweep Elbows

For plastic pipe only
90° long sweep elbow
equivalent to 5 ft. (1.5 m)
Standard long sweep elbows
Material 90° elbow equivalent length
Stainless steel
CPVC plastic pipe
PP(s)
(continued)
A
b
45° elbow equivalent length
ft. (m)
3 (0.91)
5 (1.52)
-
Direct Venting (Two-pipe System)
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).
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.)
D
Air
90° short sweep elbow equivalent
to 8 ft. (2.4 m) (if used)
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.
ft. (m)
2 (0.61)
3 (0.91)
1 (0.30)
87° elbow / 87° inspection tee
ft. (m)
-
-
1.6 (0.50)
47