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CENTRAL BLOWER COMPANY
211 S. 7th Ave. • City of Industry, CA 91746 (626) 330-3182 Fax (626) 330-9406
www.centralblower.com
SEPTEMBER 2003
CATALOG BI-2003
Backward-Inclined
BLOWERSBELT-DRIVEN SWSI NON-OVERLOADING
12 thru 27-BI
30 thru 36
(Shown with optional discharge flange)
9 & 10-BI
91Z0Central Type Bl
Centrifugal Blowersare available asU.L. Listed for
Grease Removal(UL762)
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Page 3 • Central Blower Catalog
BI BLOWER SELECTION GUIDE
The basic information needed to properly size a Central blower isthe volume of air, in cubic feet per minute (CFM) and the staticpressure (SP) in the duct system.The CFM is normally determined byhealth codes or accepted industry standards. Usually the SP is
specified by the engineer, based on the length and size of duct andnumber of elbows in the system.
The rating tables for Central blowers are easy to use.The first columnshows the volume in CFM. The second column shows thecorresponding outlet velocity in feet per minute. The remainingcolumns show the RPM and brake horsepower (BHP) at thecorresponding SP. Use the following steps to determine the RPMand BHP at required SP:
1. Choose the desired CFM.
2. Move over to the column for the specified SP.
3. Read the required RPM and BHP.*
Example: Find 800 CFM at 3/8 SP (See Fig. 2)
* After determining the required BHP it is necessary to pick thesuitable size of motor. The BHP shown in the rating tables does not
include belt losses so choose a motor rated at least 10 percenthigher than shown in rating table.
Each blower size is capable of operating over a wide range of CFMand static pressure, therefore there will be two or three differentsizes that could qualify for a given application. Select a size wherethe CFM and SP falls in the shaded area on the rating tables. Thisassures that the selected blower is operating in the optimum range.
If the point in the rating table falls below the shaded area, it wouldbe advisable to consider using the next larger size of blower, and, if the point falls above the shaded area, one should definitelyconsider using a smaller size of blower. Operating the fan outsidethe optimum efficiency range is not necessarily unsatisfactory.Other considerations such as noise level, brake horsepower, spacelimitations and engineering specifications may be governing
factors.
Figure 1 shows the typical performance for the Central BI blowers,along with the curve of mechanical efficiency. The shaded area inthis figure corresponds with the shaded area in the rating tables.(FC curves are available on request.)
Frequently specifications call for a maximum outlet velocity and tipspeed. Outlet velocity, for volumes not shown, can be calculated bydividing the CFM by the outlet area of the blower. Tip speeds aredetermined by multiplying the RPM by the tip speed factor shownabove each table.
CALCULATION OF BLOWER PERFORMANCE AT
NON-STANDARD TEMPERATURES AND ELEVATIONS
The performance tables in this catalog are based on handling air at70º F and at sea level. These are considered to be standardconditions. For blowers operating at higher temperatures andelevations use the following procedure to determine correct CFM,static pressure and BHP.
1. Determine required CFM and static pressure at actual operatingconditions.
2. Determine the combined correction factor by multiplying thetemperature factor by the altitude factor for your application.
3. Multiply the static pressure by combined factor.
4. Select blower from the performance table for the required CFMand corrected static pressure.
5. Blower RPM remains as shown in table.
6. Divide the brake horsepower shown on table by the combineddensity factor to obtain the required brake horsepower atoperating conditions.
Example:
1. Blower required to handle 5800 CFM @ 2”; SP @ 200º F and at 5000 feet
elevation.
2. Combined factor = 1.25 x 1.20 = 1.50
3. SP: 2 x 1.5= 3”.
4. Select Central model # BI-22 at 5800 CFM @ 3”;SP = 1413 RPM and 4.35 BHP
5. BHP = 4.35/1.50 = 2.80 @ 200 º F & 5000 ft.
Fig.2
AIR DENSITY CORRECTION FACTORSCORRECTION FACTORS
FOR TEMPERATURECORRECTION FACTORS
FOR ALTITUDE
Temp, ºF Factor Feet Factor0 0.87 0 1.00
40 0.94 500 1.02
70 1.00 1000 1.04
100 1.06 1500 1.06
140 1.13 2000 1.08
180 1.21 3000 1.12
200 1.25 4000 1.16
250 1.34 5000 1.20
300 1.43 6000 1.25
350 1.53 7000 1.30
3/8”RPM BHP
1/4”RPM BHPO.V. FPM
VOLUMECFM
700 2077 2130 0.19 2210 0.22 2290 0.24 2380 0.26
800 2374 2389 0.28 2455 0.30 2530 0.33 2610 0.35
900 2671 2620 0.37 2700 0.41 2770 0.44 2850 0.46
1000 2967 2850 0.48 2940 0.52 3010 0.56 3089 0.60
1/2”RPM BHP
5/8”RPM BHP
Engineering Data
SP, in.WG
Fig. 1
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Page 4 • Central Blower Catalog
Standard Features
BEARINGSSelf-aligning ball bearing pillow blocks are provided on all
models.Eccentric collars securely lock the inner race to the
shaft. Pre-lubricated and sealed to retain lubricant and
exclude dust and moisture,provide extended long life.
MOTOR BASEHeavy gauge galvanized steel base, pivoted at one end
and supported at the other by threaded rod for easy belt
adjustment. Hinge type construction insures that themotor shaft will remain parallel with the blower shaft
when adjusting belt tension.
MOTORS & DRIVESStandard motors are NEMA open-drip proof, available to
match all requirements for H.P., RPM and electrical power.
TEFC, 2-speed and explosion proof motors also available.
All Central BI blowers with motors up through 10 H.P. are
equipped with adjustable pitch motor pulleys. 15 H.P. andlarger are normally equipped with constant speed drives.
V-Belts supplied are rated to transmit 150% of motor
horsepower and are oil resistant and static dissipating.
Factory installed motors and drives are carefully checked
for smooth operation, and compliance with specifications
for RPM and amperage.
SHAFTAccurately machined from turned, ground and polished
steel shafting. Closely checked for diameter and
straightness.
FRAMEHeavy gauge, galvanized steel, all welded construction
provides rigid support for housing, motor, shaft and
bearings.
WHEELDesigned to efficiently force air through the blower
housing with backward inclined blades set at the proper
angle to prevent overloading of the motor. All sizes 12-BI
through 36-BI are equipped with steel wheels as standard
equipment and with aluminum wheels as optional equip-
ment when AMCA type B spark resistant construction is
specified.Sizes 9-BI and 10-BI are equipped with aluminum
wheels as standard equipment. Wheels are dynamically
balanced and are available in CW and CCW rotation.
HOUSINGConstructed of heavy gauge steel. Available in eight dis-
charge positions. When ordered from factory, blower will
be assembled in discharge position specified.
INLET CONESpun steel construction, smoothly contoured to guide air
into wheel with minimum turbulence. Unobstructed inlet
to provide quiet operation.
WEATHER COVERRust resistant galvanized steel construction protects the
shaft, bearings, motor and drives from the weather. Also
serves as a OSHA approved belt guard.
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HEAT SLINGERDesigned to prevent over-heating of bearing for blowers
handling air at temperatures over 250˚F. Consists of an
aluminum disk mounted on the blower shaft between the
blower housing and bearing to dissipate the heat from the
shaft.
DRAIN FITTING3/4” NPT coupling welded to low point of housing.
Recommended where condensation or rain water might
accumulate inside the housing. Plastic pipe plug supplied.
DISCONNECT SWITCHAvailable to match HP and power characteristics of the
motor supplied
VIBRATION ISOLATORSRubber In-Shear Pads: Available for units up to 18-BI size.
Suitable only for non-critical applications.
Individual Spring Mounts: Provide approximately 1”
vertical deflection. Designed for critical applications.
Spring Rails: Consists of spring isolators attached to rails
to provide more even distribution of weight. Both individ-
ual or rail type provide seismic restraint.
SPARK RESISTANT CONSTRUCTIONConforms to AMCA Type “B”. Requires non-ferrous wheel
AMCA Type “A” available.Consult factory.
INLET & OUTLET FLANGES
Available on special orders. Allow extra delivery time.
ACID RESISTANT COATINGSElectrostatically applied epoxy recommended for most
fume hood or similar applications.Other coatings are avail-
able for more extreme conditions.
AUTOMATIC BACKDRAFT DAMPERSDesigned to prevent reverse flow of air when blower is not
operating.Made to fit blower discharge.Also available with
built-in bird screen.
CLEANOUT DOORProvides access for cleaning or inspection of the interiors
of the housing. Cover plate bolted with steel fasteners and
fully gasketed.
INLET & OUTLET SCREENSPrevent entrance of birds or debris and provide protection
of personnel.
Central Blower Catalog • Page 5
Optional Features
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Performance shown is for Type B - Free Inlet,Ducted Outlet.Power rating (BHP) does not include drive losses.Performance ratings do not include the effects of appurtenances in the airstream.
Page 6 • Central Blower Catalog
91Z0Central Type Bl
Centrifugal Blowersare available asU.L.Listed for
Grease Removal(UL762)
Central Blower Co. certified that the Backwar
Inclined Blowers shown here-in are licensed to
bear the AMCA Seal.The ratings shown are base
on tests and procedures performed in
accordance with AMCA Publication 211 an
comply with the requirements of the AMCA
Certified Ratings Program.
9-BI 9 3/16-INCH WHEEL DIAMETEROUTLET AREA (SQ. FT.) .33
TIP SPEED (FPM) = 2.41 x RPMMAX. BHP = .0205 x (RPM/1000)3
1-1/2”RPM BHP
SP, in.WG
100 297 875 0.01 1054 0.01 1206 0.02 1343 0.03 1467 0.04 1690 0.05 1887 0.07 2067 0. 09 2233 0.11 2388 0.14 2672 0.19 2930 0.24 3167 0.30
2 00 59 3 1 01 2 0 .02 11 72 0. 02 1 30 7 0. 03 1 42 9 0 .04 15 43 0. 05 1 75 0 0. 07 1 93 7 0 .09 2 10 7 0. 12 2 26 5 0 .14 24 13 0. 17 268 5 0 .22 29 34 0. 28 3 16 4 0 .35
3 00 89 0 1 20 0 0 .03 13 33 0. 04 1 45 9 0. 05 1 57 5 0 .06 16 83 0. 07 1 87 4 0. 09 2 04 4 0 .12 2 20 2 0. 15 2 35 0 0 .18 24 91 0. 21 275 3 0 .27 29 93 0. 34 3 21 5 0 .41
4 00 1 18 7 1 42 9 0 .05 15 41 0. 07 1 64 5 0. 08 1 74 5 0 .09 18 42 0. 10 2 02 4 0. 13 2 19 0 0 .16 2 34 5 0. 19 2 48 4 0 .22 26 15 0. 25 2 85 9 0 .32 30 85 0. 40 3 29 8 0 .48
5 00 1 48 1 1 67 3 0 .08 17 74 0. 10 1 86 6 0. 12 1 95 3 0 .13 20 36 0. 15 2 19 6 0. 18 2 34 9 0 .21 2 49 5 0. 25 2 63 2 0 .28 27 62 0. 32 3 00 2 0 .40 32 17 0. 48 3 41 8 0 .56
6 00 1 78 1 1 92 9 0 .13 20 18 0. 15 2 10 2 0. 17 2 18 3 0 .19 22 57 0. 21 2 39 9 0. 24 2 53 5 0 .28 2 66 6 0. 31 2 79 4 0 .36 29 19 0. 40 3 14 9 0 .48 33 65 0. 57 3 56 5 0 .66
7 00 2 07 7 2 19 3 0 .18 22 72 0. 21 2 34 8 0. 23 2 42 1 0 .26 24 92 0. 29 2 62 3 0. 33 2 74 6 0 .37 2 86 5 0. 40 2 98 0 0 .45 30 92 0. 49 3 31 1 0 .59 35 17 .06 9 3 71 1 0 .79
8 00 2 37 4 2 46 2 0 .26 25 33 0. 29 2 60 2 . 0. 31 2 66 8 0 .34 27 33 0. 37 2 85 8 0. 43 2 97 3 0 .48 3 08 2 0. 52 3 18 7 0 .57 32 91 0. 61 349 0 0 .71 36 83 0. 82 3 87 1 0 .93
9 00 2 67 1 2 73 5 0 .36 28 00 0. 38 2 86 2 0. 41 2 92 3 0 .44 29 83 0. 48 3 09 8 0. 54 3 20 8 0 .61 3 31 2 0. 67 3 41 0 0 .72 35 06 0. 76 3 69 1 0 .86 38 69 0. 97 4 04 2 1 .09
10 00 2 96 7 3 01 1 0 .47 30 70 0. 50 3 12 8 0. 54 3 18 4 0 .57 32 39 0. 60 3 34 5 0. 68 3 44 8 0 .75 3 54 8 0. 82 3 64 3 0 .89 37 32 0. 95 3 90 5 1 .06 40 72 1. 16 4 23 4 1 .28
11 00 3 26 4 3 28 9 0 .62 33 44 0. 65 3 39 7 0. 68 3 44 9 0 .72 35 00 0. 76 3 59 9 0. 83 3 69 5 0 .91 3 78 9 0. 99 3 87 9 1 .08 39 68 1. 15 4 13 1 1 .28 42 88 1. 40 4 44 1 1 .52
3-1/2”RPM BHP
3.0”RPM BHP
2-1/2”RPM BHP
2.0”RPM BHP
12-BI12 1/4-INCH WHEEL DIAMETER
OUTLET AREA (SQ. FT.) .855 TIP SPEED (FPM) = 3.21 x RPMMAX. BHP = .079 x (RPM/1000)3
SP, in.WG
800 936 904 0.06 993 0.08 1077 0.10 1159 0.13 1240 0.16 1401 0.21 1548 0.27
10 00 1 17 0 1 05 5 0 .10 11 20 0. 12 1 19 0 0. 14 1 26 1 0 .17 13 29 0 .2 0 1 45 9 0. 25 1 59 3 0 .32 17 21 0 .3 9 1 84 0 0 .46 1 95 5 0 .53
12 00 1 40 4 1 19 4 0 .14 12 60 0. 16 1 32 9 0. 20 1 38 9 0 .23 14 45 0. 26 1 56 0 0. 32 1 66 9 0 .41 17 75 0. 46 1 89 0 0 .54 1 99 9 0 .62 22 00 0. 79 23 89 0. 97
14 00 1 63 7 1 35 2 0 .20 14 10 0. 23 1 46 9 0. 27 1 52 1 0 .30 15 78 0. 33 1 67 9 0. 40 1 77 9 0 .48 18 70 0. 55 1 96 5 0 .63 2 05 5 0 .71 22 49 0. 89 24 33 1. 09 2 60 0 1. 30
16 00 1 87 1 1 51 9 0 .28 15 66 0. 31 1 61 8 0. 35 1 66 7 0 .39 17 13 0. 43 1 80 9 0. 52 1 88 9 0 .58 19 89 0. 67 2 07 0 0 .75 2 15 0 0 .84 23 13 1. 02 24 82 1. 23 2 64 8 1. 44
18 00 2 10 5 1 68 0 0 .39 17 28 0. 42 1 77 0 0. 45 1 81 2 0 .50 18 60 0. 54 1 94 8 0. 62 2 03 0 0 .71 21 10 0. 80 2 19 0 0 .89 2 26 8 1 .00 24 10 1. 18 25 59 1. 39 2 70 0 1. 60
20 00 2 33 9 1 85 0 0 .48 18 90 0. 54 1 93 0 0. 59 1 97 0 0 .63 20 10 0. 67 2 09 0 0. 77 2 16 9 0 .86 22 40 0. 96 2 31 5 1 .06 2 38 6 1 .17 25 29 1. 38 26 59 1. 58 2 78 9 1. 80
22 00 2 57 3 2 02 1 0 .62 20 59 0. 70 2 09 1 0. 74 2 13 0 0 .79 21 65 0. 83 2 23 9 0. 94 2 31 0 1 .03 23 80 1. 14 2 45 0 1 .25 2 51 8 1 .36 26 41 1. 58 27 71 1. 83 2 89 0 2. 05
24 00 2 80 7 2 19 5 0 .84 22 25 0. 85 2 26 0 0. 93 2 29 0 0 .97 23 23 1. 03 2 39 0 1. 13 2 45 8 1 .23 25 20 1. 34 2 58 8 1 .46 2 65 0 1 .58 27 71 1. 83 28 90 2. 06 3 01 9 2. 33
26 00 3 04 1 2 36 9 1 .08 23 95 1. 01 2 42 5 1. 15 2 45 9 1 .18 24 85 1. 24 2 54 9 1. 35 2 61 0 1 .46 26 70 1. 59 2 73 0 1 .70 2 79 0 1 .83 29 09 2. 09 30 20 2. 36 3 12 8 2. 61
28 00 3 27 5 2 54 0 1 .34 25 69 1. 32 2 59 0 1. 32 2 62 0 1 .46 26 50 1. 48 2 70 9 1. 62 2 76 1 1 .73 28 20 1. 86 2 87 8 2 .00 2 93 0 2 .12 30 41 2. 39 31 51 2. 67 3 25 8 2. 95
30 00 3 50 9 2 71 1 1 .58 27 40 1. 65 2 76 1 1. 55 2 79 0 1 .73 28 18 1. 79 2 87 0 1. 91 2 92 0 2 .04 29 73 2. 16 3 02 9 2 .30 3 08 0 2 .45 31 81 2. 70 32 90 3. 08 3 38 9 3. 32
3-1/2”RPM BHP
3.0”RPM BHP
2-1/2”RPM BHP
2.0”RPM BHP
VOLUMECFM O.V. FPM
1/4”RPM BHP
3/8”RPM BHP
1/2”RPM BHP
5/8”RPM BHP
3/4”RPM BHP
1.0”RPM BHP
1-1/4”RPM BHP
1-3/4”RPM BHP
VOLUMECFM O.V. FPM
1/4”RPM BHP
3/8”RPM BHP
1/2”RPM BHP
5/8”RPM BHP
3/4”RPM BHP
1.0”RPM BHP
1-1/4”RPM BHP
1-1/2”RPM BHP
1-3/4”RPM BHP
10-BI 10 5/8-INCH WHEEL DIAMETEROUTLET AREA (SQ. FT.) .452
TIP SPEED (FPM) = 2.78 x RPMMAX. BHP = .0283 x (RPM/1000)3
3/4”RPM BHP
5/8”RPM BHP
1/2”RPM BHP
3/8”RPM BHP
1/4”RPM BHPO.V. FPM
VOLUMECFM
1.0”RPM BHP
1-3/4”RPM BHP
1-1/2”RPM BHP
1-1/4”RPM BHP
SP, in.WG
200 442 812 0.02 965 0.03 1098 0.04 1212 0.05 1322 0.06 1521 0.09 1698 0. 12 1857 0.15 2002 0.19 2140 0.23 2389 0.31 2611 0.40 2820 0.50
300 664 901 0.02 1041 0.04 1161 0.05 1269 0.06 1373 0.08 1561 0.11 1725 0. 14 1873 0.18 2019 0.22 2153 0.26 2403 0.35 2629 0.45 2833 0.55
4 00 88 5 1 00 0 0 .03 11 34 0 .05 12 51 0. 06 1 35 7 0. 08 14 50 0 .09 16 23 0. 13 1 77 9 0. 17 19 29 0 .21 20 67 0. 25 2 19 3 0. 30 24 25 0. 39 26 42 0 .50 2 85 0 0. 61
5 00 1 10 6 1 12 1 0 .05 12 33 0. 07 13 45 0. 08 1 44 9 0. 10 15 41 0. 12 17 10 0. 16 1 85 9 0. 20 19 95 0. 24 21 23 0. 29 2 24 8 0. 34 24 81 0. 44 26 92 0. 55 2 88 5 0. 67
6 00 1 32 7 1 25 9 0 .07 13 58 0. 09 14 51 0. 11 1 54 6 0. 13 16 36 0. 15 18 01 0. 19 1 95 0 0. 23 20 82 0. 28 22 07 0. 33 2 32 1 0. 38 25 40 0. 49 27 46 0. 61 2 94 1 0. 73
7 00 1 54 8 1 40 4 0 .10 14 91 0. 12 15 77 0. 14 1 65 9 0. 16 17 39 0. 18 18 96 0. 23 2 04 1 0. 28 21 73 0. 33 22 98 0. 38 2 41 1 0. 44 26 21 0. 55 28 17 0. 68 2 99 8 0. 81
8 00 1 72 0 1 55 9 0 .14 16 34 0. 16 17 10 0. 18 1 78 5 0. 21 18 59 0. 23 20 00 0. 28 2 13 6 0. 33 22 68 0. 38 23 88 0. 44 2 50 2 0. 50 27 11 0. 62 29 01 0. 75 3 07 5 0. 89
9 00 1 99 1 1 71 5 0 .19 17 85 0. 21 18 52 0. 24 1 92 0 0. 26 19 86 0. 28 21 18 0. 34 2 24 0 0. 39 23 62 0. 45 24 82 0. 51 2 59 6 0. 57 28 01 0. 70 29 93 0. 84 3 16 7 0. 98
10 00 2 21 2 1 87 6 0. 25 19 40 0. 27 20 01 0. 30 2 06 1 0. 32 21 23 0. 35 22 41 0. 40 2 35 8 0. 46 246 9 0 .53 25 82 0. 59 2 69 0 0. 66 28 95 0. 79 30 83 0. 94 3 25 9 1. 09
12 00 2 65 4 2 20 3 0. 40 22 59 0. 43 23 09 0. 46 2 36 4 0. 49 24 12 0. 52 25 16 0. 58 2 61 3 0. 65 271 3 0 .72 28 11 0. 79 2 90 3 0. 86 30 92 1. 01 32 72 1. 17 3 44 2 1. 34
14 00 3 09 7 2 53 9 0. 61 25 83 0. 65 26 30 0. 68 2 67 5 0. 71 2 72 1 0 .75 28 09 0. 82 2 89 8 0. 89 2 98 3 0 .97 30 69 1. 04 3 152 1. 13 33 18 1. 29 3 47 8 1 .47 3 639 1. 64
16 00 3 53 9 2 87 4 0. 89 29 16 0. 93 29 55 0. 97 2 99 8 1. 01 30 39 1. 04 31 18 1. 12 3 19 2 1. 20 326 9 1 .29 33 48 1. 37 3 42 0 1. 46 35 70 1. 64 37 18 1. 83 3 85 8 2. 02
3-1/2”RPM BHP
3.0”RPM BHP
2-1/2”RPM BHP
2.0”RPM BHP
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Performance shown is for Type B - Free Inlet,Ducted Outlet.Power rating (BHP) does not include drive losses.Performance ratings do not include the effects of appurtenances in the airstream.
Central Blower Catalog • Page 7
91Z0Central Type Bl
Centrifugal Blowersare available asU.L.Listed for
Grease Removal(UL762)
Central Blower Co. certified that the Backwar
Inclined Blowers shown here-in are licensed to
bear the AMCA Seal.The ratings shown are base
on tests and procedures performed in
accordance with AMCA Publication 211 an
comply with the requirements of the AMCA
Certified Ratings Program.
15-BI 15-INCH WHEEL DIAMETEROUTLET AREA (SQ. FT.) 1.282
TIP SPEED (FPM) = 3.93 x RPMMAX. BHP = .217 x (RPM/1000)3
SP, in.WG
1000 780 730 0. 08 809 0.11 872 0.13 934 0.16 996 0.19 1108 0.25 1217 0.32 1320 0.39 1418 0.47 1510 0.55 1682 0.72 1837 0.89 1980 1.07
1100 858 767 0. 10 847 0.13 912 0.15 969 0.18 1026 0.21 1131 0.27 1235 0.35 1334 0.42 1427 0.50 1519 0.58 1689 0.76 1843 0.94 1986 1.13
1200 936 804 0. 11 885 0.15 952 0.18 1007 0.21 1062 0.23 1160 0.30 1257 0.37 1351 0.45 1442 0.53 1529 0.62 1695 0.80 1848 1.00 1991 1.20
14 00 1 09 2 87 9 0 .14 9 59 0 .19 10 27 0. 23 1 08 6 0. 27 113 3 0 .30 12 29 0. 37 1 31 5 0. 45 14 01 0 .52 14 83 0. 61 1 56 4 0 .70 17 19 0. 89 18 65 1 .10 20 04 1. 32
16 00 1 24 8 96 0 0 .19 10 32 0. 23 11 01 0. 28 1 16 1 0. 33 121 0 0 .38 13 07 0. 46 1 38 6 0. 54 14 64 0. 62 15 39 0. 71 1 61 3 0 .80 17 56 1. 00 18 93 1. 22 20 25 1. 44
18 00 1 40 4 1 04 6 0. 24 11 10 0. 29 11 74 0. 34 1 23 5 0. 40 1 28 5 0 .46 13 85 0. 55 1 46 6 0. 64 153 7 0 .73 16 07 0. 82 1 67 4 0 .92 18 06 1. 12 19 34 1. 35 20 57 1. 59
20 00 1 56 0 1 13 6 0. 31 11 93 0. 36 12 51 0. 42 1 30 8 0. 47 1 36 0 0 .52 14 60 0. 65 1 54 3 0. 76 161 7 0 .87 16 83 0. 96 1 74 5 1 .06 18 67 1. 28 19 87 1. 50 21 01 1. 74
22 00 1 71 6 1 22 7 0. 39 12 79 0. 44 13 32 0. 50 1 38 5 0. 56 1 43 5 0 .62 15 35 0. 76 1 61 9 0. 89 169 4 1 .01 17 63 1. 13 1 82 3 1 .23 19 38 1. 45 20 49 1. 69 21 58 1. 93
24 00 1 87 2 1 31 9 0. 48 13 68 0. 54 14 17 0. 60 1 46 4 0. 67 1 51 1 0 .74 16 07 0. 88 1 69 3 1. 02 177 0 1 .16 18 39 1. 29 1 90 5 1 .42 20 15 1. 56 21 19 1. 90 22 21 2. 15
26 00 2 02 8 1 41 3 0. 58 14 59 0. 65 15 03 0. 72 1 54 8 0. 79 1 59 2 0 .86 16 81 1. 01 1 76 7 1. 17 184 4 1 .32 19 15 1. 47 1 97 3 1 .61 20 96 1. 89 21 96 2. 14 22 92 2. 40
28 00 2 18 4 1 50 8 0. 71 15 51 0. 78 15 93 0. 85 1 63 4 0. 92 1 67 5 0 .99 17 59 1. 15 1 83 9 1. 32 191 8 1 .49 19 89 1. 66 2 05 5 1 .82 21 72 2. 12 22 76 2. 41 23 68 2. 69
30 00 2 34 0 1 60 3 0. 85 16 44 0. 92 16 84 1. 00 1 72 2 1. 07 1 76 0 1 .14 18 36 1. 31 1 91 5 1. 67 199 0 1 .67 20 63 1. 85 2 12 9 2 .03 22 48 2. 37 23 54 2. 69 24 48 3. 00
32 00 2 49 6 1 69 9 1. 00 17 38 1. 09 17 76 1. 17 1 81 3 1. 25 1 84 9 1 .33 19 21 1. 50 1 99 3 1. 68 206 5 1 .87 21 35 2. 06 2 20 3 2 .26 23 23 2. 63 24 30 2. 99 25 27 3. 33
34 00 2 65 2 1 79 6 1. 18 18 33 1. 27 18 69 1. 36 1 90 4 1. 44 1 93 8 1 .52 20 06 1. 71 2 07 0 1. 89 214 2 2 .08 22 09 2. 29 2 27 5 2 .49 23 97 2. 90 25 06 3. 30 26 03 3. 66
36 00 2 80 8 1 89 2 1. 38 19 28 1. 47 19 62 1. 57 1 99 6 1. 66 2 02 8 1 .75 20 92 1. 93 2 15 7 2. 12 222 0 2 .32 22 85 2. 53 2 34 8 2 .75 24 71 3. 19 25 79 3. 61 26 80 4. 03
38 00 2 96 4 1 99 0 1. 60 20 24 1. 70 20 56 1. 80 2 08 8 1. 89 2 11 9 1 .98 21 81 2. 18 2 24 2 2. 38 230 2 2 .59 23 62 2. 80 2 42 4 3 .02 25 43 3. 48 26 54 3. 94 27 53 4. 38
40 00 3 12 0 2 08 7 1. 84 21 20 1. 95 21 51 2. 05 2 18 2 2. 15 2 21 1 2 .25 22 71 2. 46 2 32 8 2. 66 238 7 2 .88 24 42 3. 09 2 50 2 3 .32 26 16 3. 80 27 27 4. 29 28 28 4. 76
42 00 3 27 6 2 18 5 2. 11 22 16 2. 22 22 47 2. 33 2 27 6 2. 44 2 30 4 2 .55 23 62 2. 76 2 41 6 2. 97 247 2 3 .19 25 27 3. 42 2 58 0 3 .65 26 92 4. 14 27 99 4. 64 29 02 5. 16
3-1/2”RPM BHP
2-1/2”RPM BHP
18-BI 18 1/4 -INCH WHEEL DIAMETEROUTLET AREA (SQ. FT.) 1.898
TIP SPEED (FPM) = 4.78 x RPMMAX. BHP = .580 x (RPM/1000)3
3/4”RPM BHP
5/8”RPM BHP
1/2”RPM BHP
3/8”RPM BHP
1/4”RPM BHPO.V. FPM
1.0”RPM BHP
1-3/4”RPM BHP
1-1/2”RPM BHP
1-1/4”RPM BHP
SP, in.WG
1600 843 594 0. 12 651 0.16 704 0.20 760 0.25 813 0.30 913 0.40 1000 0.51 1088 0.62 1169 0.74 1245 0.87 1387 1.14 1517 1.46 1637 1.80
1800 948 641 0. 15 692 0.19 742 0.24 789 0.28 840 0.34 935 0.45 1022 0.57 1100 0.68 1178 0.80 1254 0.94 1393 1.21 1520 1.51 1639 1.86
2000 1054 690 0. 19 737 0.23 783 0.28 827 0.33 869 0.38 959 0.50 1044 0.63 1123 0.75 1194 0.88 1263 1.01 1401 1.30 1527 1.61 1643 1.932200 1159 739 0. 23 784 0.28 826 0.33 868 0.38 907 0.43 987 0.55 1067 0.68 1144 0.83 1217 0.97 1284 1.11 1410 1.40 1535 1.72 1651 2.05
2400 1264 789 0. 28 833 0.33 872 0.38 911 0.44 948 0.49 1019 0.61 1095 0.75 1167 0.90 1238 1.05 1307 1.21 1428 1.51 1544 1.83 1659 2.18
2600 1370 839 0. 33 881 0.39 920 0.45 956 0.50 991 0.56 1060 0.69 1125 0.82 1195 0.97 1262 1.13 1327 1.30 1452 1.63 1561 1.96 1668 2.31
2800 1475 890 0.39 931 0.46 969 0.52 1003 0. 58 1036 0.64 1101 0.77 1163 0. 91 1224 1.05 1290 1.22 1352 1. 39 1474 1.75 1585 2. 11 1685 2.47
30 00 1 58 1 94 2 0 .46 9 82 0 .53 10 17 0. 60 1 05 1 0. 67 10 82 0 .73 11 44 0. 87 1 20 4 1. 01 12 61 1 .15 13 18 1. 31 1 38 0 1. 49 1 49 4 1. 86 1 60 8 2. 27 1 70 9 2. 64
32 00 1 68 6 99 4 0 .54 10 32 0 .61 10 67 0. 69 1 10 0 0. 76 11 30 0 .83 11 89 0. 97 1 24 6 1. 12 13 01 1 .27 13 54 1. 43 1 40 8 1. 60 1 52 1 1. 99 1 62 6 2. 39 1 73 2 2. 82
34 00 1 79 1 1 04 6 0. 66 10 83 0. 71 11 17 0. 78 1 14 9 0. 86 11 79 0. 94 12 35 1. 09 1 28 9 1. 24 134 2 1 .40 13 94 1. 56 1 43 3 1. 73 1 54 9 2. 12 1 65 2 2. 54 1 75 1 2. 97
36 00 1 89 7 1 09 9 0. 72 11 34 0. 81 11 67 0. 89 1 19 8 0. 97 12 28 1. 05 12 82 1. 21 1 33 4 1. 37 138 5 1 .54 14 35 1. 71 1 48 3 1. 88 1 57 8 2. 25 1 67 9 2. 69 1 77 4 3. 13
38 00 2 00 2 1 15 2 0. 83 11 86 0. 92 12 81 1. 01 1 24 8 1. 09 12 77 1. 18 13 31 1. 35 1 38 0 1. 52 142 9 1 .69 14 77 1. 86 1 52 4 2. 04 1 61 3 2. 41 1 70 8 2. 85 1 80 2 3. 31
42 00 2 21 3 1 25 9 1. 07 12 91 1. 17 13 21 1. 27 1 35 0 1. 37 13 77 1. 46 14 28 1. 66 1 47 6 1. 85 152 1 2 .03 15 65 2. 22 1 60 8 2. 41 1 69 4 2. 81 1 77 4 3. 21 1 85 8 3. 68
46 00 2 42 4 1 36 8 1. 37 13 97 1. 47 14 25 1. 58 1 45 2 1. 69 14 78 1. 80 15 27 2. 01 1 57 3 2. 22 161 7 2 .43 16 58 2. 63 1 69 8 2. 83 1 77 7 3. 25 1 85 6 3. 69 1 92 9 4. 13
50 00 2 63 4 1 47 6 1. 71 15 04 1. 83 15 30 1. 95 1 55 6 2. 06 15 81 2. 18 16 28 2. 41 1 67 2 2. 54 171 4 2 .87 17 54 3. 10 1 79 2 3. 31 1 86 6 3. 76 1 93 9 4. 22 2 01 1 4. 69
54 00 2 84 5 1 58 6 2. 11 16 12 2. 24 16 37 2. 37 1 66 1 2. 49 16 84 2. 62 17 29 2. 88 1 77 2 3. 12 181 2 3 .37 18 51 3. 62 1 88 8 3. 86 1 95 8 4. 34 2 02 7 4. 82 2 09 4 5. 31
58 00 3 05 6 1 69 6 2. 58 17 20 2. 71 17 44 2. 85 1 76 7 2. 98 17 89 3. 12 18 32 3. 40 1 87 3 3. 67 191 2 3 .93 19 49 4. 20 1 98 6 4. 48 2 05 4 4. 98 2 11 7 5. 49 2 18 2 6. 01
62 00 3 26 7 1 80 6 3. 11 18 29 3. 25 18 51 3. 40 1 87 3 3. 54 18 94 3. 69 19 36 3. 98 1 97 5 4. 28 201 3 4 .56 20 49 4. 84 2 08 4 5. 13 2 15 1 5. 70 2 21 3 6. 24 2 27 2 6. 79
3-1/2”RPM BHP
3.0”RPM BHP
2-1/2”RPM BHP
2.0”RPM BHP
VOLUMECFM O.V. FPM
1/4”RPM BHP
3/8”RPM BHP
1/2”RPM BHP
5/8”RPM BHP
3/4”RPM BHP
1.0”RPM BHP
1-1/4”RPM BHP
1-1/2”RPM BHP
1-3/4”RPM BHP
2.0”RPM BHP
3.0”RPM BHP
VOLUMECFM
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Central Blower Catalog • Page 9
Performance shown is for Type B - Free Inlet,Ducted Outlet.Power rating (BHP) does not include drive losses.Performance ratings do not include the effects of appurtenances in the airstream. 91Z0
Central Type BlCentrifugal Blowers
are available asU.L.Listed for
Grease Removal(UL762)
Central Blower Co. certified that the Backwar
Inclined Blowers shown here-in are licensed to
bear the AMCA Seal.The ratings shown are base
on tests and procedures performed in
accordance with AMCA Publication 211 an
comply with the requirements of the AMCA
Certified Ratings Program.
24-BI 24.50-INCH WHEEL DIAMETEROUTLET AREA (SQ. FT.) 3.490
TIP SPEED (FPM) = 6.41 x RPMMAX. BHP = 2.420 x (RPM/1000)3
3/4”RPM BHP
5/8”RPM BHP
1/2”RPM BHP
3/8”RPM BHP
1/4”RPM BHPO.V. FPM
VOLUMECFM
1.0”RPM BHP
1-3/4”RPM BHP
1-1/2”RPM BHP
1-1/4”RPM BHP
SP, in.WG
2800 802 428 0.18 476 0.25 522 0.32 565 0.40 606 0.448 680 0.65 748 0.83 811 1.02 872 1 .22 929 1.43 1034 1.86 1 130 2 .30 1217 2.77
3200 917 457 0.23 504 0.31 547 0.38 587 0.46 626 0.55 698 0.74 763 0.93 824 1.13 881 1 .34 936 1.56 1040 2.02 1 135 2 .51 1222 3.01
3600 1032 491 0.28 534 0.37 575 0.45 613 0.54 649 0.63 718 0.83 781 1.03 840 1.25 895 1 .47 948 1.70 1047 2.18 1 141 2 .71 1227 3.25
4000 1146 525 0.35 567 0.44 605 0.53 641 0.63 676 0.73 740 0.93 801 1.15 859 1.38 912 1 .62 963 1.86 1059 2.37 1 148 2 .90 1234 3.47
4400 1261 561 0.43 600 0.52 637 0.62 670 0.72 703 0.83 766 1.05 824 1.27 879 1.51 931 1 .77 981 2.03 1074 2.56 1 161 3 .12 1242 3.70
4800 1375 598 0.51 634 0.62 670 0.72 702 0.83 733 0.94 792 1.18 848 1.42 901 1.67 952 1.93 1001 2.20 1091 2.77 1 176 3.36 1256 3.97
5200 1490 636 0.62 670 0.72 703 0.84 735 0.95 765 1.07 821 1.32 875 1.58 925 1.84 974 2.11 1021 2.39 1110 2.98 1 193 3.60 1270 4.24
5600 1605 674 0.73 707 0.85 738 0.97 768 1.09 797 1.22 851 1.48 902 1.75 952 2.03 998 2.30 1044 2.59 1130 3.21 1 212 3.86 1288 4.53
6000 1719 712 0.86 744 0.99 774 1.11 802 1.24 830 1.38 883 1.65 931 1.93 979 2.23 1025 2 .53 1 068 2.82 1152 3.46 1 231 4 .13 1306 4.83
7000 2006 811 1.27 839 1.41 866 1.56 892 1.70 916 1.85 964 2.16 1 010 2.48 1 053 2.80 1095 3.14 1136 3 .48 1213 4.18 1286 4.88 1358 5.64
8000 2292 912 1.79 936 1.95 960 2.12 984 2.29 1007 2.45 1051 2.79 1 093 3.14 1 134 3.51 1172 3.87 1209 4 .25 1282 5.02 1351 5. 82 1417 6 .60
90 00 2 57 9 10 14 2 .4 4 10 36 2 .63 1 05 7 2. 82 1 079 3. 01 1 10 1 3 .19 1 14 1 3. 57 1 17 9 3. 95 1 21 7 4 .34 1 25 4 4 . 75 12 90 5. 16 1 35 6 5. 99 1 42 1 6 . 86 1 48 4 7. 76
1 00 00 2 86 5 11 17 3 .2 5 11 37 3 .46 1 15 7 3. 67 1 176 3. 88 1 19 6 4 .09 1 23 4 4. 50 1 27 0 4. 92 1 30 5 5 .35 1 33 8 5 . 77 13 72 6. 22 1 43 7 7 .. 13 1 49 7 8 . 06 1 55 5 9. 01
1 10 00 3 15 2 12 21 4 .2 3 12 39 4 .46 1 25 8 4. 69 1 275 4. 92 1 29 5 5 .16 1 32 8 5. 61 1 36 3 6. 07 1 39 6 6 .53 1 42 7 6 . 99 14 58 7. 46 1 51 9 8. 44 1 57 8 9 . 44 1 63 3 10 .5
1 20 00 3 43 8 13 25 5 .4 0 13 42 5 .65 1 35 9 5. 90 1 376 6. 15 1 39 2 6 .41 1 42 4 6. 91 1 45 7 7. 41 1 48 8 7 .90 1 51 8 8 . 41 15 47 8. 91 1 60 3 9. 93 1 66 0 1 1. 0 1 71 4 12 .1
3-1/2”RPM BHP
3.0”RPM BHP
2-1/2”RPM BHP
2.0”RPM BHP
27-BI 27.00 -INCH WHEEL DIAMETEROUTLET AREA (SQ. FT.) 4.260
TIP SPEED (FPM) = 7.07 x RPMMAX. BHP = 3.982 x (RPM/1000)3
3/4”RPM BHP
5/8”RPM BHP
1/2”RPM BHP
3/8”RPM BHP
1/4”RPM BHPO.V. FPM
VOLUMECFM
1.0”RPM BHP
1-3/4”RPM BHP
1-1/2”RPM BHP
1-1/4”RPM BHP
SP, in.WG
3400 798 390 0.21 430 0.630 467 0.34 502 0.45 538 0.55 604 0.79 669 0.99 730 1 .22 785 1.45 838 1 .69 930 2.20 1 017 2 .78 1 095 3.33
3800 892 414 0.27 452 0.36 488 0.42 520 0.52 552 0.63 615 0.87 680 1.10 738 1 .32 790 1.58 840 1 .82 935 2.33 1020 2 .94 1 098 3 .55
4200 985 442 0.34 482 0.44 512 0.52 545 0.60 572 0.73 630 0.95 691 1.20 145 1 .43 795 1.72 845 1 .95 940 2.50 1024 3 .14 1 100 3 .784600 1080 470 0.40 509 0.50 538 0.61 568 0.72 593 0.83 648 1.05 706 1.30 758 1 .56 802 1.85 855 2 .10 942 2.66 1 029 3 .33 1 105 4.00
5000 1174 504 0.44 540 0.58 566 0.70 592 0.83 622 0.96 667 1.17 722 1.42 771 1 .70 812 2.00 866 2 .28 950 2.84 1 030 3 .56 1 110 4.22
5400 1268 530 0.54 568 0.67 593 0.82 617 0.95 648 1.08 688 1.30 740 1.56 786 1 .84 827 2.16 880 2 .30 958 3.04 1 038 3 .75 1 115 4.49
5800 1362 560 0.65 597 0.80 620 0.94 645 1.09 673 1.22 710 1.42 760 1.56 804 2 .00 842 2.31 892 2 .60 967 3.23 1 048 3 .96 1 122 4.70
6200 1455 592 0.77 626 0.90 648 1.08 674 1.22 702 1.37 738 1.60 780 1.88 822 2 .18 863 2.50 910 2 .81 980 3.42 1 059 4 .20 1 132 4.93
6600 1549 623 0.92 655 1.05 675 1.22 702 1.38 728 1.52 777 1.76 803 2.06 843 2 .38 886 2.69 928 3 .03 996 3.68 1 082 4 .47 1 141 5.23
7000 1643 658 1.07 687 1.20 704 1.36 732 1.52 755 1.68 793 1.93 831 2.25 868 2.59 908 2.90 949 3 .24 1014 3.95 1 088 4.72 1 152 5.51
8000 1878 738 1.50 760 1.62 779 1.78 803 1.92 822 2.14 860 2.45 900 2.82 936 3.19 969 3.55 1 006 3.88 1069 4.68 1 130 5.48 1194 6.36
9000 2113 816 2.00 834 2.14 854 2.31 876 2.45 890 2.73 929 3.12 970 3.41 1 002 3.96 1032 4.35 1 065 4 .67 1127 5.60 1 182 6.42 1 240 7.28
10000 2347 894 2.63 910 2.80 929 2.97 948 3.16 967 3.48 1000 3.90 1039 4.33 1070 4.88 1098 5.30 1 129 5.95 1189 6.83 1240 7.70 1293 8.40
11 00 0 2 58 2 9 72 3 .4 1 98 8 3. 60 10 05 3 .80 1 02 2 3 .9 8 1 04 0 4 .3 0 10 74 4 .81 1 10 9 5 .2 4 1 13 8 5 .8 5 11 66 6 .3 5 11 93 6 .8 0 1 2 52 7 .8 7 1 30 2 8 .85 1 35 0 9 .7 3
12 00 0 2 81 7 1 05 2 4 .4 0 106 7 4. 52 1 08 2 4 .70 1 102 4 .9 3 1 12 1 5 .2 8 1 15 0 5 .85 1 17 8 6 .3 0 1 21 3 6 .8 8 12 38 7 .5 0 1 26 4 8 . 00 1 32 0 9 .0 5 1 36 5 1 0.3 1 41 2 1 1. 2
13 00 0 3 05 2 1 13 2 5 .4 5 114 5 5. 60 1 16 0 5 .74 1 180 6 .0 0 1 19 8 6 .4 2 1 22 9 7 .02 1 25 3 7 .5 2 1 28 2 8 .1 5 13 05 8 .7 5 1 33 2 9 . 25 1 39 0 1 0.5 1 43 0 1 1.8 1 47 7 1 2. 8
14 00 0 3 28 6 1 21 0 6 .5 5 122 2 6. 73 1 23 8 6 .95 1 256 7 .2 9 1 27 5 7 .6 6 1 30 7 8 .35 1 33 0 8 .9 0 1 35 5 9 .5 8 13 82 1 0. 3 1 40 5 1 0 .8 1 46 0 1 2.1 1 49 5 1 3.5 1 54 0 1 4. 6
3-1/2”RPM BHP
3.0”RPM BHP
2-1/2”RPM BHP
2.0”RPM BHP
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WARRANTYCentral Blower Co. (the Company) warrants that each blower manufactured by the Company shall be free
from defects in material and workmanship under normal use and service for a period of eighteen (18) months
from the date of shipment or twelve (12) months from date of original installation,“whichever occurs first.” If
it appears within the warranty period that the blower does not meet the warranties specified above and the
purchaser notifies the Company promptly, the Company agrees to remedy any such defect,at the Company’s
option, either by repairing any defective parts or by furnishing at the Company’s factory a repair or replace-
ment part.
This warranty shall not apply to any equipment which has been repaired or altered in any way so as, in theCompany’s judgement,to affect its performance or reliability,nor which has been improperly installed or sub-
ject to misuse, negligence or accident. This warranty does not apply to electric motors, which however, carry
warranty of the motor manufacturer.Warranty does not apply to drive belts.
This warranty is expressed in lieu of all other warranties expressed or implied, and of all other obligations or
liabilities on the Company’s part. The Company neither assumes, nor authorizes any representative or other
persons to assume for it,any other liability in connection with the sale of its equipment.
Central Blower Catalog • Page 11
12/03
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CENTRAL BLOWER CO.
211 S. 7th Ave. • City of Industry, CA 91746 (626) 330-3182 Fax (626) 330-9406
www.centralblower.com
Other Central Products
Series FCDDouble Inlet Forward Curved Blowers
Sizes: 18,22, 26 and 30
Series FCBelt Drive Blowers
Sizes 9 thru 30”
Forward Curved andBackward Inclined Wheels
Coated LaboratoryExhaust Fans