Install The Ductwork - GE JGP990 Installation & Owner's Instructions

Installation Instructions
PREPARATION
[] PLAN THE DUCT RUN
1. Make a sketch of the total system. IdeutiI}' the
t)pe of each fitting and the length of straight
pipe. Refer to the examples on page 25.
2. Enter your mn into the Duct I,ength Chart on
page 25. Elbows, wall caps and other fittings
are shown in the chart with their equiwflent
straight duct length. Each fitting \Mue i//tlst be
added to the amotmt of straight duct length
used to determine the overall straight duct
equiwflent length. Use the tollowiug examples
as a guide.
3. Using good quality ducting material, install per
these inst_ uctions. A tew minutes and pennies
spent now will pay long term dividends fl)r the
life of the cooktop.
[] INSTALL THE DUCTWORK
• Ducting must confl)m_ to local code materials.
• IMPORTANT: Save ti)i" local electrical
iusl)ector's use.
• Use galvanized or almninmn duct in 6" round
or 3¼" x 10" size, or a combination of both.
NOTE: i,ocal building codes must be fl)llowed
in sI)ecilk'ing,, ai)proved type and schedule of
AI,I, duct used.
• Always use au ai)i)ropriate roof or wall cap with
damper.
_. ' Through c abinet t oe space
Betweenfloor joist
Downward venting
• Intmdry type wall caps should NEVER be used.
• Install ductwork, making male-female
connections in the direction of airflow as
shown. Secure all joints with sheet metal screws
and duct tape to assm'e an airtight seal.
Ducttape over seam
and screw
Air flow
Screw
24
• Use the shortest mad straightest duct run possible.
For satisfactory performm_ce, the duct run should
not exceed 100 feet equivalent length.
• Use the Ductlongth Charton page 25 to find the
equivalent length of the run.
• Ducting a cooktop is easy but critical ti)r proper
l)e rl[oi'iila u ce.
• _dter reading these instructions, plan the duct rtm.
• Install rite duct hardware.
GENERAL CONSIDERATIONS:
1. Lrse quality metal duct el at least 26-gauge
gal\mfized or 24-gauge aluminum. Inli_fior quali b'
pipe and fittings can cause up to twice the
restriction shown and is a poor wdue. See the
Prepare for Duct Work section (ff this manual tot
optional trade>slab ducting. I,ocal codes may
require a heavier gauge material or restrict PVC.
2. Distance between a@_cent fittings (elbows,
transitions, etc.) should be at least 18". The
tarther the better. Closer distance promotes
tm'bulence which reduces airflow,
3.
4.
5.
The nmnber of downstream elbows
or
transitions should be limited to three.
Hanchnade crimps are likely to cause restrictions.
If an alternate wall or roof cap is used, be
certain duct size is not reduced and that there
is a backdrait damper. It is best to use listed
caps to be certain of proper performance.
6, Themml breaks: In areas of extreme cold weather;
it may be necessary to provide a short length ot
nomnetallic duct as close to the wall as possible
to prevent conduction along the metal duct.
7. High altitude installations: It is advisable to
reduce allowable duct rtlu by 20%.
8. Follow the duct calculation in this manual
careflfllv fl)r best pe_timnance and satistacfiou.