© 2018 MacroAir Technologies Toll Free: 866 668 3247 Fax: 909 890 2313 www.macroairfans.com 9
Rev. Date 040218
Fan Clearance - Rapid Mount Industrial
WARNING: FANS ARE NOT MEANT TO BE OPERATED IN WINDY CONDITIONS.
The Rapid Mount Industrial should only be used in applications where the total clearance
between the mount and the airfoils is less than 10 feet. Otherwise use a Universal Mount with
guy wires (refer to page 45). The minimum distance of a fan to a wall or similar obstruction
should be no less than 1.5 times the diameter of the fan.
Maximum Angle for Mount (feet)
Slope (in)
0
2/12
4/12
6/12
8/12
10/12
Roof Angle
0
9.5
o
18.4
o
26.6
o
33.7
o
39.8
o
Diameter
Recommended Total Drop (Mount to Airfoil) Length (ft)
8 feet
3
3
3
4
5
6
10 feet
3
3
4
5
6
8
12 feet
3
3
5
6
7
9
14 feet
3
4
5
7
9
N/A*
16 feet
3
4
6
8
10
N/A*
18 feet
3
5
6
9
N/A*
N/A*
20 feet
3
5
7
10
N/A*
N/A*
24 feet
4
6
9
N/A*
N/A*
N/A*
*Need Universal Mount with guy wires
The table below shows the clearance
needed from the fan to obstructions such
as lighting, conduit, etc.
Minimum Clearance (Horizontal / Vertical inches):
Airfoil / Drop Length (ft)
2
3
4
5
6
7
8
9
10
8 feet
9 / 14
11 / 14
13 / 14
15 / 15
17 / 15
19 / 16
22 / 17
25 / 17
29 / 18
10 feet
9 / 16
11 / 16
13 / 17
15 / 17
17 / 18
19 / 18
22 / 19
25 / 20
29 / 21
12 feet
9 / 18
11 / 19
13 / 19
15 / 19
17 / 20
19 / 21
22 / 22
25 / 23
29 / 24
14 feet
9 / 21
11 / 21
13 / 22
15 / 22
17 / 23
19 / 24
22 / 25
25 / 26
29 / 27
16 feet
9 / 24
11 / 24
13 / 24
15 / 25
17 / 26
19 / 27
22 / 28
25 / 29
29 / 31
18 feet
9 / 27
11 / 27
13 / 28
15 / 28
17 / 29
19 / 30
22 / 31
25 / 33
29 / 34
20 feet
N/A
11 / 31
13 / 31
15 / 32
17 / 33
19 / 34
22 / 35
25 / 37
29 / 38
24 feet
N/A
11 / 39
13 / 40
15 / 20
17 / 42
19 / 43
22 / 44
25 / 46
29 / 48
The drop lengths above are minimum recommendations only, based solely on roof pitch and
fan diameter. Other factors, such as allowing for proper airflow into the fan must be evaluated
when determining drop length requirements. In addition, MacroAir strongly recommends that
the fan airfoils must be a minimum of 10 feet (3.05 meters) above the floor. Contact Technical
Support for assistance with fan placement and drop length selection (Technical Support contact
information can be found on page 74).
Rise = X”
Run = 12”
Roof Slope =
Rise/Run
