Preferred 4” Hoods
When you have a 4” (10cm) Hood
Maximum length of 4” diameter metal duct.
Number of 90˚
elbows/bends
Rigid
Thick Wall Flexible Metal
(fully extended)
0
64ft
19.5m
36ft
10.9m
1
54ft
16.5m
31ft
9.4m
2
44ft
13.4m
27ft
8.2m
3
35ft
10.6m
25ft
7.6m
4
27ft
8.2m
23ft
7.0m
Acceptable 2 1⁄2”Hood
When you have a 2 1⁄2” (6cm) Hood
Maximum length of 4” diameter metal duct.
Number of 90˚
elbows/bends
Rigid
Thick Wall Flexible Metal
(fully extended)
0
58ft
17.6m
28ft
8.5m
1
48ft
14.6m
23ft
7.0m
2
38ft
11.5m
19ft
5.7m
3
29ft
8.8m
17ft
5.1m
4
21ft
6.4m
15ft
4.5m
For exhaust systems not covered by the exhaust duct length charts (such as multiple unit
hook-ups, plenums, and power-assist fans), call our Customer Care Center: TOLL FREE 888 9FNP USA
(888 936 7872).
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