Bathroom CFM Exhaust Fan Requirements
To use Table 1, find your ceiling height and then move cross to your room width and then room length.
The CFM on Table 1, is a calculated amount and in most cases you will not be able to find an exhaust fan that has the exact CFM value.
Treat these values as minimums and purchase the exhaust fan with the closest CFM rating above the number in the table.
Table 1 must be used in conjunction with the EDL calculation and table.
Table 1 - Bathroom Exhaust Fan Requirements |
|||||||
Bathroom Size (Feet) |
CFM |
Bathroom Size (Feet) |
CFM |
||||
Height |
Width |
Length |
Height |
Width |
Length |
||
7 |
4 |
4 |
15 |
8 |
4 |
4 |
17 |
5 |
19 |
5 |
21 |
||||
6 |
22 |
6 |
26 |
||||
7 |
26 |
7 |
30 |
||||
8 |
30 |
8 |
34 |
||||
5 |
5 |
23 |
5 |
5 |
27 |
||
6 |
28 |
6 |
32 |
||||
7 |
33 |
7 |
37 |
||||
8 |
37 |
8 |
43 |
||||
9 |
42 |
9 |
48 |
||||
6 |
6 |
34 |
6 |
6 |
38 |
||
7 |
39 |
7 |
45 |
||||
8 |
45 |
8 |
51 |
||||
9 |
50 |
9 |
58 |
||||
10 |
56 |
10 |
64 |
||||
11 |
62 |
11 |
70 |
||||
7 |
7 |
46 |
7 |
7 |
52 |
||
8 |
52 |
8 |
60 |
||||
9 |
59 |
9 |
67 |
||||
10 |
65 |
10 |
75 |
||||
11 |
72 |
11 |
82 |
||||
8 |
8 |
60 |
8 |
8 |
68 |
||
9 |
67 |
9 |
77 |
||||
10 |
75 |
10 |
85 |
||||
11 |
82 |
11 |
94 |
||||
12 |
90 |
12 |
102 |
||||
9 |
9 |
76 |
9 |
9 |
86 |
||
10 |
84 |
10 |
96 |
||||
11 |
92 |
11 |
106 |
||||
12 |
101 |
12 |
115 |
||||
10 |
10 |
93 |
10 |
10 |
107 |
||
11 |
103 |
11 |
117 |
||||
12 |
112 |
12 |
128 |
||||
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Back to Bathroom Exhaust Fan Performance Graph