|
|
Rated Fan CFM |
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|
|
50 |
80 |
100 |
125 |
150 |
200 |
250 |
300 |
|
|
|
|
|
|
|
|
|
|
|
Duct Dia. |
Smooth Hard Duct - Maximum Duct Length in Feet |
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|
3” |
5 |
X |
X |
X |
X |
X |
X |
X |
|
4” |
114 |
31 |
10 |
X |
X |
X |
X |
X |
|
5” |
NL |
152 |
91 |
51 |
28 |
X |
X |
X |
|
6” |
NL |
NL |
NL |
168 |
112 |
53 |
25 |
9 |
|
7” |
NL |
NL |
NL |
NL |
NL |
148 |
88 |
54 |
|
8” |
NL |
NL |
NL |
NL |
NL |
NL |
198 |
133 |
|
|
|
|
|
|
|
|
|
|
|
Duct Dia. |
HVAC Flex Duct - Maximum Duct Length in Feet |
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|
3” |
X |
X |
X |
X |
X |
X |
X |
X |
|
4” |
56 |
4 |
X |
X |
X |
X |
X |
X |
|
5” |
NL |
81 |
42 |
16 |
2 |
X |
X |
X |
|
6” |
NL |
NL |
158 |
91 |
55 |
18 |
1 |
X |
|
7” |
NL |
NL |
NL |
NL |
161 |
78 |
40 |
19 |
|
8” |
NL |
NL |
NL |
NL |
NL |
189 |
111 |
69 |
|
NL: No limit; X: not allowed Table assumes no elbows. Deduct 15 ft from allowable duct length for each elbow. |
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