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TABLE 2.
DUCTWORK INSTALLATION GUIDELINES
•
For safety reasons, ducting should vent directly
outdoors (not into an attic, underneath the house, into
the garage or into any enclosed space).
•
Keep duct runs as short and straight as possible.
•
Duct fittings (elbows and transitions) reduce air flow
efficiency.
•
Back to back elbows and "S" turns give very poor
delivery and are not recommended.
•
A short straight length of duct at the inlet of the
remote blower gives the best delivery.
•
Transition to duct from the integral blower or remote
duct transition as close to the downdraft as is pos-
sible. In order of preference, use
1st. 10" round duct
2nd. 8" round duct
3rd. 3-1/4" x 14" duct
4th. 7" round duct
5th. 3-1/4" x l0" duct
6th. 6" round duct
•
The use of flexible metal round duct should only be
used when no other duct fitting exists. Limit use to
short lengths and do not crush when making corners.
Step 2: Prepare Countertop Cutout
For installation with a Bosch cooktop, refer to Part A and
Figure 7 (Page 7)). For installation with another brand of
cooktop, refer to Part B (Page 8).
For all installations verify that all cutouts will clear the inside
of the front countertop support rail, and that the cooktop and
vent will be centered left to right within the cutout. Also,
make certain that the front and rear cutouts are straight and
parallel to the front edge of countertop and the rear backs-
plash and/or wall. Assure that the side cutouts are square
to the front and rear cutouts. All illustrations and dimen-
sions are based on standard 24" deep by 36" high American
style base cabinets with 25" countertops.
When installing laminated or solid surface countertops such
as Surell™ and Corian
®
, be sure to follow the countertop
manufacturer's instructions regarding minimum corner radii,
reinforcement of corners, etc.
•
Where local codes permit, plastic pipe (PVC-schedule
40 pipe or ABS pipe 7" or 8" diameter) can be used in
areas of high ground moisture and in slab floors to
eliminate future rusting.
•
Use only duct work constructed of materials that are
acceptable by the applicable codes. All duct should
be 26 gauge or heavier to minimize flex due to air flow.
•
The remote blowers requires a 10" or 8" diameter
round duct (depending on model) to match the inlet
ring. A transition is necessary from other duct sizes.
•
Use sheet metal screws as required to support the
duct weight, and seal all joints with duct tape.
•
Be certain that the duct work does not interfere with
floor joists or wall studs.
•
Do not exhaust more than one vent into a single duct
run.
•
Thermal breaks, such as a short section of nonmetal-
lic duct, should be used in areas of extreme cold.
•
Always use an appropriate roof or wall-cap with
damper. Laundry type wall caps should never be used.
For overhead cabinet and cooktop side clearances
consult cooktop Installation Instructions.
A. For installation with a Bosch cooktop (Figure 7 and
Table 2)
Provide an opening in the countertop as specified in
Table 3 (Page 8). Make sure that the distance from the
front of the countertop to the front of the cutout is not
less than dimension "SB". Verify that the available flat
countertop is greater than dimensions "OW" by "OD".
Make certain that the backsplash thickness does not
exceed dimension "BT".
Page 6
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