GE JVB98SH Venting Duct Information, Plan the Ductwork, Specification Created 7/03, Duct Pieces

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JVB98SH – GE Profile™ 36" Telescopic Downdraft System

Venting Duct Information

Duct Pieces	Equivalent Length*	Duct Pieces	Equivalent Length*
	1 ft. (per foot length)	3-1/4" x 10"	5 ft.
6" Round		to 6" Round
Straight		Transition
3-1/4" x 10"	1 ft. (per foot length)	6" Round	20 ft.
		to 3-1/4 x 10"
Straight		Transitions
		90° Elbow
6"	15 ft.	3-1/4" x 10"	12 ft.
		to 6" Round
°		Transition
90 Elbow		90° Elbow
6"	9 ft.	6" Round	21 ft.
45° Elbow		Wall Cap
		with Damper
3-1/4" x 10"	16 ft.	3-1/4" x 10"	27 ft.
		Wall Cap
90° Elbow		with Damper
3-1/4" x 10"	5 ft.	6" Round	20 ft.
		Roof Cap
45° Elbow
3-1/4" x 10"	24 ft.	6" Round	24 ft.
		Roof Vent
45° Elbow
6" Round		SHOULD NOT EXCEED 100 EQUIVALENT FT.
	7 ft.	*Equivalent length of duct pieces are based on actual test conducted by
to 3-1/4 x 10"
Transitions		GE Evaluation Engineering and reflect requirements for good venting
		performance with a downdraft rated at 500 CFM

Specification Created 7/03

Plan the Ductwork

1. This downdraft blower system is designed for use with 3-1/4" x 10" ductwork (can be transitioned to 6" round). Two different discharge directions are available with side-to-side adjustment for the 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.

Right discharge

Left discharge (as shipped)

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.

1. Ensure that the total equivalent length of ducting does not exceed the maximum recommendation of 150 feet.

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