MVT26
October 2003
Section A
Page 105
Natural ventilation should only be used up to a maximum drive power of 20 hp. To determine the size of
the required intake and exhaust openings, refer to the following table: .
A.4.2.2.4 Forced Ventilation
If the natural ventilation is insufficient, the circulation of cooling air must be increased by the installation
of an exhaust fan. To determine the required intake opening and exhaust flow refer to the following table:
Drive hp
Intake and Exhaust Openings Dependent on Room Volume (V) and Height (h)
V = 1750 ft³ h = 6.5 ft
V = 3500 ft³ h = 10 ft
V = 7000 ft³ h = 13 ft
Intake (ft²)
Exhaust (ft²)
Intake (ft²)
Exhaust (ft²)
Intake (ft²)
Exhaust (ft²)
3
1.3
1.1
---
---
---
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5
3.2
2.7
1.3
1.1
---
---
7.5
4.5
3.8
2.6
2.2
1.3
1.1
10
9.7
8.1
6.5
5.4
2.6
2.2
15
14.5
12.4
9.7
8.1
5.8
4.8
20
20.6
17.2
15.6
12.9
9.7
8.1
Drive
hp
Dependence on Room Size (V) and Height of Exhaust Opening (h)
a
a.
The intake sizes given in the above table are for a cooling air velocity of 1000 ft./min. BAUER recommends that the cooling air velocity be in the range of 600 ft./min.
to 2000 ft./min.
V = 1750 ft³ h = 8 ft
V = 3500 ft³ h = 10 ft
V = 7000 ft³ h = 13 ft
Intake (ft²)
Exhaust cfm
Intake (ft²)
Exhaust cfm
Intake (ft²)
Exhaust cfm
25
3.3
3300
3.2
3200
3.0
3000
30
4.0
3960
3.8
3840
3.6
3600
40
5.3
5280
5.1
5120
4.8
4800
50
6.6
6600
6.4
6400
6.0
6000
60
7.9
7920
7.7
7680
7.2
7200
75
9.9
9900
9.6
9600
9.0
9000
100
13.2
13200
12.8
12800
12.0
12000
125
16.5
16500
16.0
16000
15.0
15000
150
19.8
19800
19.2
19200
18.0
18000