Standard Long Sweep Elbows (For Cpvc / Pvc / Abs Pipes Air Intake Use Only) - Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual

Flexible Venting Installation
Vent Length Requirements

Standard long sweep elbows (for CPVC / PVC / ABS pipes air intake use only)

For Plastic pipe only
90° long sweep elbow
equivalent to 5 ft. (1.5 m)
Fig. 15
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.
Table 8. Standard long sweep elbows
Material
CPVC plastic pipe
PP(s) flexible pipe system
(continued)
90° elbow
equivalent length
5 ft. (1.52 m)
---
Direct Venting (Two-pipe System)
90° short sweep elbow
equivalent to 8 ft. (2.4 m) if used
45° elbow
equivalent length
3 ft. (0.91 m)
1 ft. (0.3 m)
87° elbow /
87° inspection tee
---
1.6 ft. (0.5 m)
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