Planing The Ductwork - GE JVB36 Owner's Manual

Installation of the downdraft system.
Read these instructions completely and carefully.
Planning the Ductwork
This downdraft blower system is designed
for use with 3
transitioned to 6" round). Two different
discharge directions are available with side-to-
side adjustment for accurate alignment of
ductwork.
Left discharge (as shipped)
For best performance: Choose the ducting
option which allows the shortest length of
ductwork and a minimum number of elbows
and transitions. Check location of floor joists,
wall joists, wall studs, electrical wiring or
plumbing for possible interference.
Duct
Pieces
6" Round
Straight
" x 10"
3 1 ⁄
4
Straight
6"
90° Elbow
6"
45° Elbow
" x 10"
3 1 ⁄
4
90° Elbow
SHOULD NOT EXCEED 150 EQUIVALENT FT.
*Equivalent lengths of duct pieces are based on actual tests conducted by GE Evaluation Engineering
and reflect requirements for good venting performance. See chart for CFM Duct Length.
10
" x 10" ductwork (can be
⁄
1
4
Equivalent Duct
Length* Pieces
1 ft. (per
foot length)
1 ft. (per
foot length)
15 ft.
9 ft.
16 ft.
Steps to Determine Flexible Ducting's Equivalent Length
Measure the actual amount of offset
(Maximum 3" recommended). The effect
upon airflow is dependent upon the amount
of offset.
Calculate the equivalent ducting
allowances using:
( ___ in. offset) x (14 ft. per inch)
= ___ ft. equivalent length.
Ensure that the total equivalent length of
ducting does not exceed the maximum
recommendation of 150 feet.
Right discharge
Equivalent
Length*
" x 10"
3 1 ⁄
4
5 ft.
45° Elbow
" x 10"
3 1 ⁄
4
24 ft.
90° Flat Elbow
6" Round
" x 10"
to 3 1 ⁄ 7 ft.
4
Transition
" x 10"
3 1 ⁄
4
to 6" Round 5 ft.
Transition
6" Round
" x 10"
to 3 1 ⁄
4
20 ft.
Transition
90° Elbow
Duct Equivalent
Pieces Length*
" x 10"
3 ⁄
1
4
to 6" Round
12 ft.
Transition
90° Elbow
6" Round
Wall Cap 21 ft.
with Damper
" x 10"
3 ⁄
1
4
Wall Cap 27 ft.
with Damper
6" Round
20 ft.
Roof Cap
6" Round
24 ft.
Roof Vent