Standard Long Sweep Elbows (For Cpvc / Pvc / Abs Pipes Air Intake Use Only) - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

Direct Venting (Two-pipe System)
Vent Length Requirements
Legend
A Vent pipe 3.3 ft. (1 m)
B 45º elbow
C Vent pipe 1.6 ft. (0.5 m)
D 90º elbow
E PP(s) adaptor (110 mm to 100 mm when using
M&G system with Vitocrossal 300 CU3A 45 or 57)
F Air intake adaptor
G Flex pipe with adaptor set
H Chimney cap with termination pipe
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
CPVC plastic pipe
PP(s) flexible pipe system
68
(continued)
Always include vent termination length in calculations.
Equivalent vent length calculation example
(Vitocrossal 300 CU3A 26/35 systems diameter 3 in.)
Maximum allowable equivalent length is 149 ft. (45 m)
2 x 90º stainless steel elbow....................6 ft. (1.83 m)
2 x 45º stainless steel elbow....................4 ft. (1.22 m)
Air intake pipe
1 x 90º plastic (ABS/CPVC/PVC) elbow.....5 ft. (1.52 m)
1 x 45º plastic (ABS/CPVC/PVC) elbow.....3 ft. (0.91 m)
Exhaust vent pipe..................................10 ft. (3.05 m)
Air intake pipe.......................................10 ft. (3.05 m)
Combined total equivalent vent length
(a+b)...................................................38 ft. (11.58 m)
90° elbow
equivalent length
5 ft. (1.52 m)
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CU3A Venting Systems Installation
IMPORTANT
45° elbow
equivalent length
3 ft. (0.91 m)
1 ft. (0.3 m)
87° elbow /
87° inspection tee
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1.6 ft. (0.5 m)