DFOB-100 - page 2

Design 51 BI fans are available in all
four construction classes to meet the
specific application requirements, from
light duty Class I fans for supply air to
Class IV for harsh industrial environ-
ments. Construction classes comply
with AMCAPublication 99.
Class I
unitary base
fan built to
handle a light
dust and fume
environment
with 304
stainless steel
airstream.
2
Sizes 135 to807
Pressuresover28"WG
Volumes to263,000CFM
Temperatures to800°F
Arrangements 1,8,9, 10
Chicago’sDesign 51
SingleWidth fan,
a reliable industry staple
for decades, is now
readily available as a
standard pre-engineered
serieswithBackward
Inclinedwheels
.
Add up
the features and you
have one tough fan.
ThisClass III fan is equipped
with aluminumwheel for
AMCATypeB spark resistant
construction.
to theDesign 51 BI, the radial bladed
blower is less efficient and louder as
well. Less efficiency means a higher
horsepowermotor.This in turnmeans
higher electric bills, and a louder fan
thatwill requireexpensivesilencersor
acoustical insulation to adhere to
OSHA requirements.
SINGLEWIDTH
BACKWARD INCLINED
DESIGN51 BI FANS
For construction
details and options,
use this code.
CLASS I
Static Pressures
to 7"W.G.
In addition, the large operating range
makes the Design 51 BI ideal for low
volume, medium pressure applica-
tions. Other manufacturers will have
to select a radial bladed or narrow
width blower for the same perform-
ance requirements. When compared
More Efficient, LessCostly
thanRadial Bladed Fans
FanConstruction toMatch
YourAirstream
CLASS II
Static
Pressures
to 12"W.G.
CLASS III
Static
Pressures
to 19"W.G.
CLASS IV
Sizes 150
through 807.
Static
Pressures
to 28"W.G.
1 3,4
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