GE JP389BJBB Use and Care Manual - Page 31

Step 5C

Determine

Flexible

Ducting's Equivalent Length

1.

Measure

the

actual

amount

of

offset

(maximum

3" recommended).

The

effect

upon

airflow

is dependent

upon

the

amount

of offset.

2.

Calculate

the

equivalent

ducting

allowances

using:

(___

in. offset)

x (14 ft. per

inch)

= ___ ft. equivalent

length.

3.

Enter

the

calculated

value

into

TABLE

1 of

this

Installation

Instruction.

4.

Ensure

that

the

total

equivalent

length

of

ducting

does

not

exceed

the

maximum

recommendation

of 100 feet.

Step 6

Installing the Ductwork

Use minimum

26 gauge

galvanized

or 24 gauge

aluminum

duct

in 6" round

or 31A

" x 10" size, or

combination

of both.

PVC

duct

should

be used

if installing

under

a poured

concrete

slab.

NOTE:

Local

building

code

must

be followed

in

specifying

approved

type

and

schedule

of PVC

duct

used.

5" round

duct

may

be used

on

SHORT

DUCT

runs.

But,

note

higher

equivalent

lengths

for

each

5" dia. piece

used.

Don't

convert

back

to

5" duct

after

use

of 6" round

or 31A" x 10" duct.

Always

use

an

appropriate

roof

or wall

cap

with

damper.

Laundry

type

wall

caps

should

NEVER

be

used.

Thru Cabinet

Toe Space

Between

Floor

Joist

Downward

Venting

Install

ductwork,

making

male-female

connections

in direction

of airflow

as shown.

Secure

all joints

with

sheet

metal

screws

and

duct

tape

to assure

airtight

seal.

Duct Tape Over Seam

-and

Screw

Air

Screw

Select

downward

or wall

venting.

To

convert

blower

exhaust

direction,

remove

four

nuts

inside

the

plenum

which

hold

blower

and

wire

finger

guard.

Remove

blower

and

rotate

so that

exhaust

faces

downward

or rear

direction,

as

needed.

Replace

wire

finger

guard

and

nuts.

Retighten

nuts.

Blower

exhaust

direction

can

be

adjusted

slightly

while

in its vertical

or horizontal

direction

by loosening

four

nuts

holding

blower,

rotating

blower

and

retightening

nuts.

Use

the

shortest

and

straightest

duct

run

possible.

For

satisfactory

performance

the

duct

run

should

not

exceed

100 feet

equivalent

length.

Refer

to

TABLE

i of equivalent

lengths.

Use

TABLE

I to

calculate

the

total

equivalent

length

of the

ductwork.

Inside Wall

to Roof

Direct to Outside

Rear Wall Venting

(continued

next page)

31

GE JP389BJBB Use and Care Manual - Page 31

Step 5C, Step 6

Page 31 highlights