Ductwork Table; Plan Ductwork - GE JVB34 Use And Care & Installation Manual

Plan the Ductwork
Left discharge
1. This downdraft blower system is designed
for use with 3 1 ⁄ x 10 ductwork (can be transitioned
4
to 6 round). Three different discharge
directions are available with side--to-side
adjustment for accurate alignment of ductwork.
2. 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.
NOTE: The unit is shipped with the 3
discharge facing DOWN. See the Changing
Blower Direction section, if necessary.
Duct Pieces
6 Round
Straight
3 1 ⁄ x 10
4
Straight
6
90° Elbow
6
45° Elbow
3 1 ⁄ x 10
4
90° Elbow
3 1 ⁄ x 10
4
45° Elbow
3 ⁄ x 10
1
4
90° Flat Elbow
6 Round
to 3 1 ⁄ x 10
4
Transition
8
INSTALLATION INSTRUCTIONS
Right
discharge
Down discharge
(as shipped)
1 ⁄ x 10
4
Equivalent Length*
1 ft. (per foot length)
1 ft. (per foot length)
15 ft.
9 ft.
16 ft.
5 ft.
24 ft.
7 ft.
(continued)
Steps to 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. Ensure that the total equivalent length of
ducting does not exceed the maximum
recommendation of 100 feet.
Venting Island to Outside Wall
Wall
24 Power
Cord provided
(on-right-hand side)
Duct Pieces
3 1 ⁄
4
to 6 Round
Transition
6 Round
to 3 1
Transition
90° Elbow
3 1 ⁄
4
to 6 Round
Transition
90° Elbow
6 Round
Wall Cap
with Damper
3 1 ⁄
4
Wall Cap
with Damper
6 Round
Roof Cap
6 Round
Roof Vent
SHOULD NOT EXCEED 100 EQUIVALENT FT.
*Equivalent lengths of duct pieces are based on actual tests conducted by
GE Evaluation Engineering and reflect requirements for good venting
performance with a downdraft rated at 500 CFM.
7
Equivalent Length*
x 10
⁄ x 10
4
x 10
x 10
29 1 /
2
5 ft.
20 ft.
12 ft.
21 ft.
27 ft.
20 ft.
24 ft.