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*

Bolt-on

Inlet Box

The inlet box

simplifies

ductwork

connection when

a

90°

turn at

the

fan

inlet is

required.

Chicago

Blower's

streamlined inlet box

design

assures

dependable

fan

performance.

The

inlet box is bolted

to

the

fan's

punched

flanged

inlet

accessory.

The

non-fan

end

of

the inlet

box

includes

its

own

flange

with

punched

bolt

pattern

for

easy

connection

to

ductwork

and

can

also

support

the

weight

of

a

pre-spin

inlet

damper

for

variable

systems.

*

Integral

Inlet

Box

Same

as

the bolt-on inlet box

except

the

integral

inlet box is

welded

to

the

fan

housing

instead

of

bolted

to

the

punched

flanged

inlet.

Used

on

Arrangement

3S1

and

7S1

fans

to

move

the inboard

bearing

outside the airstream and increase

theirtemperature

capability

to

800°F.

*

Mixing

Box

Available

as a

bolt-on extension

to

an

inlet box.

Mixing

Box is

standard

with

a

circular,

flanged

port

for flue gas

recirculation

on

burner

systems.

The

flue gas

is mixed

with

fresh

air

in

the

mixing

box and re-circulated back

through

the

fan's

inlet. The

mixing

box size

matches the

inlet

box

area

and

flange

pattern.

It

is

shipped

loose

with

the

fan for field

installation.

Spark

Resistant

Construction

AMCA

Type

C

spark

resistant construction consists

of

an

aluminum inlet

cone

with

steel wheel and

an

aluminum

buffer

tube between the wheel

backplate

and

housing. Type

C

construction is

typically

used

in

clean

air

applications.

The

maximum

temperature

for

Type

C

is

650°F.

Type

C

construction is

not

available

with

the

Inlet Volume

Control

accessory.

The

user

must

electrically ground

the

fan.

AMCA

Type

B

spark

resistant construction is also available.

Type

B

construction consists

of

steel inlet

cone

with

aluminum wheel

and

an

aluminum

buffer

tube

between

the

wheel

backplate

and

housing. Type

B

construction is

typically

used when there is

a

trace amount

of ferrous

solids

in

the

airstream.

The maximum

temperature

for

Type

B

is

200°F.

Type

B

construction is

not

available

with

the Inlet

Volume

Control

accessory.

The

user

must

electrically

ground

the

fan.

VibrationBase

Fan is

welded

onto

a

base

of

continuously

welded structural

steel channel

for

mounting

to

rubber-in-shear

or

spring

isolators.

AWS

Code

Welding

Chicago

Blower's

welding

criteria

meets

or

exceeds

most

specifications,

but there

are

times when

more

stringent

applications require

extra

welding

control.

In

order

to

provide

this,

the

AWS

code

defines

welding

machine

settings,

weld

positions,

and

the

steel

used

for

construction.

AWS

code

welding

is also

an

equivalent

standard

to

ASME Section

IX

welding. Non-rotating

fan

parts

are

welded

to

AWS Code

D1.1.

Rotating

parts

are

welded

to

AWSCode

D14.6.

*

Special

Coatings

Chicago's

standard

black enamel

paint

is

an

excellent

coating

that

provides

protection

in

most

indoor and outdoor

environments. Numerous

special

paint

and corrosion

resistant

coatings

are

also available

to meet

the

most

stringent

requirements

and

provide

extra

protection

to

the

steel

fan

components.

*

Split

Housing

Housings

can

be

furnished

with

either

pie-shaped

wedge

split

or a

housing

that is

split

along

the horizontal centerline.

Pie

wedge

split

can

be unbolted

from

the main

housing

and

allow

easy

removal

of

the

wheel and

shaft for

service

or

repair

without

disconnecting

the inlet

or

outlet ductwork.

Horizontal

split

can

be

unbolted

from

the

main

housing

and

shipped

loose

with

the

fan.

This is done

to

reduce overall

fan

height

and

can

decrease

shipping

costs to

you.

The

horizontal

split

is

standard

on

sizes

660

and

above.

*

Insulation

Studs

Side

notched

steel

rectangular

studs that

are

welded

to

the

fan

housing.

The studs allow

for field

attachment

of

thermal

or

acoustical insulation

onto

the

fan

housing.

*

Industrial

Dampers

Dampers provide precise

air control

for

varying

or

partial

load

applications.

Pre-spin

type

inlet

dampers

are

mounted

to

the inlet box

and

control the

incoming

air

similar

to

an

Inlet Volume

Control.

Outlet

Dampers

offer

an

economical solution

to

Inlet Volume

Control;

however,

they

require

substantially

more

horsepower

at

reduced air

volumes.

Dampers

are

available

with

a

control handle

for

manual

operation.

Automatic

operation

is also available

5