Standard Long Sweep Elbows (For Cpvc Pipe Only) - Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual

Direct Venting (Two-pipe System)
Vent Length Requirements
Maximum vent/air intake pipe length - horizontal/vertical
(hybrid system) (continued)
Flue
C
c
B
a
Fig. 57 Vitodens 200-W WB2B 45, 60, 80, 105

Standard long sweep elbows (for CPVC pipe only)

For plastic pipe only
90° long sweep elbow
equivalent to 5 ft. (1.5 m)
Fig. 58
Table 27 Standard long sweep elbows
Material 90° elbow equivalent length
Stainless steel
CPVC plastic pipe
PP(s)
56
(continued)
A
b
45° elbow equivalent length
ft. (m)
3 (0.91)
5 (1.52)
-
Rigid Venting Systems Installation Instructions
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)