DFO-103 - page 3

Certified
Ratings
Chicago Blower Corporation
certifies that the Design 51
Airfoil Fans shown herein are
licensed to bear the AMCA
seal. Ratings shown are based
on tests and procedures
performed in accordance with
AMCA Publication 211 and
complywith the requirementsof
the AMCA Certified Ratings
Program. Performance shown
is forAirfoil fanswith inletsopen
andoutlet ducted.
0
20
40
60
80
100
PERCENTVOLUME
100
100
80
80
60
60
40
40
20
20
PERCENTPRESSURE
PERCENTEFFICIENCYandHORSEPOWER
Chicago’s Design 51 airfoil wheel has
ideal characteristics for variable air vol-
ume systems. With a smooth pressure
curve, major changes in pressure will
causeonlyminor changes involume.The
broad, high-efficiency curveoffersexten-
sive selections from each fan size and
alsoawideoperating range.The smooth
Rugged wheels of continuously welded
heavy gauge steel provide maximum
integrity and longevity.Wheels are also
designed for high-cycle duty common
withVFDcontrol.Wheel assemblydesign
has been verified with a finite element
analysis.Spunsteelwheel conesoptimize
air flowwhileprecisionbalancingassures
dependable vibration-freeoperation.
Strengthenedhousingshavecontinuously
weldedheavysteel constructionwith rigid
Built-inPerformance
Built-inReliability
stable air flow over the entire perform-
ance range is the result of Chicago’s
deepspun inlet, wheel conesandgener-
ous housing proportions. Sound levels
are also diminished with the improved
inlet air glidepath.A typical performance
curve is shownabove.
steel bearing supports. Stiff bracing re-
sistsdistortioncausedbysuddenair flow
variations.
The finest precision shafts are selected,
turned, ground and polished SAE 1040-
1045steel.Heavy-dutybearingsareself-
aligning ball or roller type, computer se-
lected for aminimumof 75,000hoursav-
erage life at maximumclass speeds and
horsepowers.Bearing life is extended by
extremely close tolerance fits.
3
ChicagoBlower’s
airfoil wheel provides static
efficiencies exceeding82%.
Classes I, II, III available.
1,2 4,5,6,7,8,9,10,11,12,13,...52
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