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Direct Venting (Two-pipe System)
Vent Length Requirements
Standard long sweep elbows
90° long sweep elbow
equivalent to 5 ft. / 1.5m
Fig. 47
Note:
If standard sweep elbows are used the allowable vent lengths are reduced.
One standard 90° elbow is equivalent to 8ft. / 2.4m of straight pipe.
Table 38. Standard long sweep elbows
Material
Stainless steel
CPVC plastic pipe
54
For plastic pipe only
90° short sweep elbow
equivalent to 8 ft. / 2.4m
(if using)
90° equivalent
45° equivalent
length elbow
length elbow
ft. / m
ft. / m
3 / 0.91
2 / 0.61
5 / 1.52
3 / 0.91
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