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Design

Features

Rugged

Steel

Housing

and Pedestal

The

high grade

steel

housing

and drivetrain

pedestal

is

continuously

welded

by

welders

certified

to

American

Welding

Society

(AWS)

code standards

for

maximum

strength

and

rigidity.

Structural

steel

stiffeners

are

added

to

further

increase

strength.

The drivetrain

pedestal

is

an

A-frame

design

that is wider

at

the bottom than

at

the

top

to

increase

stability

in

the

foundation

and resist

vibration.

Long

Bearing

Life

The

bearings

are

anti-friction

ball

or

spherical

roller

with

pillow

block

housings

and

are

available

with

grease

or

oil

lubrication.

They

are

sized

for

a

minimum

L-10

life

of

40,000

hours

at

class maximum

speed

and

motor

horsepower.

Since

most

applications

do

not

operate

at

either class maximum

speed

or

motor

horsepower,

the

actual

bearing

life

is

much

longer.

Maximum Fan

Efficiency

Grade

FEG

The

Design

95

is rated

with

the

highest

Fan

Efficiency

Grade

(FEG)

of

90,

in

accordance

with

the

Air

Movement

Control

Association

(AMCA)

Publication

205.

FEG

is

a

classification

for

industrial

fans

which

grades

the

fan's

peak

mechanical

efficiency

relative

to

its wheel diameter.

A

higher

FEG

means a more

efficient fan.

Each

performance

table

on

pages

8

through

16

is

labeled

with

the

FEG

90

rating.

Precision

Shafts

All

shafts

are

made

from

1045

cold rolled steel

or

equivalent.

The

shafts

are

turned,

ground,

and

polished

to

assure

tight bearing

and hub

fit.

Shafts

are

sized

so

the

fan

running

speed

is

30%

or more

below the

first

critical

speed

to

avoid

resonance

and

minimize vibration.

Backward

Curved

Advantage

Chicago's

backward curved wheel consists

of

solid

steel

blades

continuously

welded

to

a

streamlined wheel

sideplate

and

heavy

steel

backplate.

They

can

withstand

temperatures

to

800°F.

The backward curved wheels

have

true

non-overloading

horsepower

characteristics

with

a

steep

stable

pressure

curve

and mechanical

efficiencies

over

84%.

Inlet

Cone

Punched

Outlet

Shaft

and

Bearing

Guard

Punched

Flanged

Inlet

Split

Housing

Backward

Curved

Wheel

3