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Fan Selection Charts

Centrifugal Blower CFM Chart : ( CFM Values at different pressures for 960 RPM Motor )

 
Press.in inches W.G.
1
2
3
4
5
6
8
10
12
16
20
24
28
32
36
48
50
RPM
Motor H.P.
Approximate capacity in Cu. Feet / Minute. at N.T.P.
960
0.25
1000
500
300
200
100
-
-
-
-
-
-
-
-
-
-
-
-
960
0.5
2000
1000
700
500
400
300
100
-
-
-
-
-
-
-
-
-
-
960
0.75
3000
1600
1100
800
600
400
200
-
-
-
-
-
-
-
-
-
-
960
1
4000
2200
1500
1100
800
600
400
300
300
100
-
-
-
-
-
-
-
960
1.5
5600
3200
2200
1700
1300
1000
700
400
400
200
-
-
-
-
-
-
-
960
2
6200
4100
2900
2200
1800
1400
1000
700
500
300
200
-
-
-
-
-
-
960
3
-
6100
4300
3400
2700
2200
1600
1200
900
500
400
300
200
100
-
-
-
960
5
-
10100
6900
5600
4600
3800
2800
2100
1700
1100
700
600
500
400
200
-
-
960
7.5
-
14400
10300
8200
6800
5800
4300
3300
2700
1800
1300
900
800
600
600
400
300
960
10
-
17800
13800
11600
8900
7300
5800
4600
3700
2500
1900
1300
1000
900
800
500
500
960
12.5
-
-
17000
13000
11100
9400
7200
5700
4700
3400
2500
1900
1400
1100
1000
700
600
960
15
-
-
20000
15500
13000
11200
8700
7000
5700
4200
3100
2400
1800
1400
1200
900
800
960
20
-
-
27300
20700
17000
14700
11500
9400
7800
5700
4400
3500
2700
2100
1700
1200
1200
960
25
-
-
31400
26000
20700
18100
14300
11700
9800
7300
5700
4600
3700
2900
2300
1600
1500
960
30
-
-
32900
30200
24800
21400
16800
13900
11700
8800
7000
5600
4600
3700
3000
1900
1900
960
40
-
-
-
39000
33100
27700
22100
18300
15600
11900
9500
7800
6500
5400
4500
2700
2500
960
50
-
-
-
47900
40500
34500
27200
22600
19300
15000
12000
9900
8300
7100
6000
3600
3300
960
60
-
-
-
50900
47700
41500
32200
26900
23000
18000
14600
12000
10200
8700
7500
4700
4300
960
75
-
-
-
-
53000
51000
39100
33100
28500
22400
18400
15300
13000
11200
9700
6300
5900
960
100
-
-
-
-
-
53000
51800
44200
37300
29700
24600
20700
17600
15300
13400
9100
8600


CFM Values at different pressures for 1400 RPM Motor


 

Press.in inches W.G.

123456810121620242832364850
RPMMotor H.P.Approximate capacity in Cu. Feet / Minute. at N.T.P.
14000.251000500300200100------------
14000.519001000700500400300200100---------
14000.75280016001100800600500300200---------
14001-200014001100800700500300300100-------
14001.5-30002100170013001100800600400200-------
14002-400028002200180015001000800600400200100-----
14003-58004100330027002200170013001000700400300200100---
14005-840068005300440037002800230018001300900600500400300200-
14007.5--9900830064005500430035002800200015001100900700600400200
140010--12800103008400720057004600380029002200170013001000800600500
140012.5--1540013100103008900700058004800360028002200180014001100700700
140015---149001240010600840069005800440034002700220018001500900900
140020---193001640013700109009100770059004700380032002600220011001100
140025---2480020000172001350011200960074005900490041003400290017001600
140030----236002060016000133001140089007200590050004300360023002100
140040----3040026700207001740015000118009700810068005900510034003100
140050----329003280025900214001850014700122001020087007500660044004200
140060-----38300312002500021900177001460012300105009100800056005300
140075-----4350038100311002720021600181001540013300116001020073006900
1400100------492004150035100284002390020500179001570013800101009600


CFM Values at different pressures for 2800 RPM Motor


 

Press.in inches W.G.

123456810121620242832364850
RPMMotor H.P.Approximate capacity in Cu. Feet / Minute. at N.T.P.
28000.25600400300200200100100----------
28000.5-1000700500400300200100---------
28000.75-14001000800600500300300200--------
28001-190014001000900700500400300200100------
28001.5--2000150013001000800600500300200100-----
28002--26002100170014001100900700500400200200100---
28003--3700300024002100160013001100800500400300300200--
28005---48004000340027002200190014001100800600600400200200
28007.5---59005900510039003300280021001700130011001000800400400
280010----75006600510043003600290023001900160014001200700700
280012.5----820081006400530045003600290025002000170015001000900
280015-----950077006200540043003500300025002100180012001200
280020-----10800100008200710055004700390034002900250018001700
280025------1220010200870070005900500044003800330023002200
280030------14300122001040084007000600052004600410029002800
280040------166001590013900110009200790070006100540040003800
280050-------19500172001350011400990086007700680051004900
280060-------2250020400161001360011700103009200830061005900
280075--------2500020300167001450012900115001030078007500
2800100--------285002660022000191001690015100137001050010100


Motor Selection

The shaft power (H) lines shown on each performance curve indicates the input power at the fan shaft in kW. To determine the minimum motor power required to drive the fan, this fan shaft power H has to be multiplied by a safety coefficient which accounts for power losses in belt drives and a reasonable safety margin. The recommended values for the safety coefficient are as under: Safety Coefficient = 1.20 for H upto 10 kW = 1.12 for H over 10 kW The reasonable safety margin mentioned above takes care of any small change in the operating point or fan speed, which may be due to possible minor inaccuracies in calculation of system pressure drop or a pulley ratio slightly different from the design value. For conversion to horsepower (hp), 1 hp = 0.746 kW. With motors larger than 7.5 kW (10 hp), the use of a star/delta (Y/Δ) starter is highly recommended.
 2023-01-19T08:07:07

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