– 12 –
Step 4 – Preparing the Countertop
Clearance between inside front of cabinet and rear
of countertop cutout must be 20-5/8 in. in order to
accommodate cooktop depth.
A 1/2-in.-wide flat area is required around the
edge of the opening to support the unit. The
cooktop unit must be level and sit squarely into the
countertop opening.
Carefully cut countertop opening according to the
dimensions shown in the illustration. Be sure the
opening is cut squarely, with sides parallel to each
other and rear exactly perpendicular to sides.
Step 5 – Preparing for Ductwork
Note: Ductwork must be vented to outside. Do
not vent into a wall, ceiling, crawl space, attic, or
other concealed space.
• When cutting or drilling into wall or ceiling, do
not damage electrical wiring or other hidden
utilities.
Cut hole in cabinet wall or floor as appropriate for
your installation. Make sure exhaust duct is lo-
cated between wall studs or floor joists.
Step 5A – Blower to Ductwork Alignment
In general, the use of flexible ducting is discour-
aged because it can cause severely restricted
airflow. However, if the blower outlet and the floor
or wall duct location do not align well, then flexible
metal ducting can be used to adapt to an offset.
Good alignment without use of flexible ducting is
best.
Note: Do not exceed the maximum recommended
offset of 6 in.
• Do not allow the flexible ducting to kink or
collapse.
• Do stretch the flexible ducting as much as
possible to eliminate as much of the corrugation
as possible.
Step 5B – Determine Flexible Ducting’s
Equivalent Length
1. Measure the actual amount of offset (maxi-
mum of 6 in. is recommended). The effect
upon airflow is dependent upon the amount of
offset.
2. Calculate the equivalent ducting allowances
using:
(___ in. offset) x (5 ft. per inch)
= ___ ft. equivalent length
3. Enter the calculated value into Table 1 of
Ductwork Calculations.
4. Ensure that the total equivalent length of
ducting does not exceed the maximum recom-
mendation of 100 ft.
9
1
8
"
8
3
4
"
10
1
8
"
6
1
8
"
Rear Wall Venting
Downward Venting
GEA00201
20
5
8
"
2
3
8
" Min.
25"
28
7
8
"
GEA00199
20
5
8
"
2
3
8
" Min.
GEA00198
6" Max.
Centerline
to Centerline
Offset
(Requires Kit JXRW89)
GEA00305
Bottom Venting
Back Venting
