GE JVB37 Owner's Manual And Installation Instructions page 13

Installation Instructions
DUCTWORK LENGTH AND DUCT FITTINGS
NOTE: Do not exceed 150 foot maximum permissible equivalent lengths!
Flexible ducting: If flexible metal ducting is used, all equivalent feet values in the table should be
doubled. The flexible metal duct should be straight and smooth and extended as much as possible.
(_DO NOT use flexible plastic ducting.
Add equivalent lengths for all duct pieces and transitions used to ensure that the duct run does not
exceed the maximum 150 feet.
im n
m
1 ft. (per
foot length)
1 ft. (per
foot length)
15ft.
I_]f_i _ II_ _ i0_l L=_111_'1_
6" Round
3W" x 10" 3V4" x 10" 24 ft. Wall Cap 21 ft,
Straight 90 ° Flat Elbow with Damper
(_ 6" Round [_ 3V4" x 10"
6" to 3V4" x 10" 7 ft. Wall Cap 27 ft.
90 ° Elbow Transition with Damper
3V4" x 10" _
6" to 6" Round 5 ft. ]_ 6" Round 20 ft. 45 ° Elbow 9 ft. Transition Roof Cap
6" Round
to 3V4" x 10" 20 ft,
3W" x 10" Transition 6" Round 24 ft.
90 ° Elbow 16 ft. 90 ° Elbow Roof Vent
SHOULD NOT EXCEED 150 EQUIVALENT FEET
*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,
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