Broan Best K8087 Owner's Manual page 11

PREPARE THE HOOD
NON - DUCTED CONFIGURATION
Note: The following materials must be purchased separately for non-ducted
recirculation installations.
Non - Ducted Recirculation Kit,
Model NDK7780
5" diameter expandable / flexible aluminum duct.
1/16" diameter twist drill.
CAUTION: Do not use plastic or rigid metal ducting.
1. Determine the length of the compressed flexible aluminium ducting using the
following formula:
Distance above cook
35" MINUS
top. See page 9 for
mounting height
restrictions.
Worksheet: 35" - __________ + __________ (for 9" ceiling only) = __________
2. Discard discharge collar and damper
supplied with the hood. Install the 5" to 6"
adapter supplied with the Non-Ducted
Recirculation Kit. Fig. 8
3. Attach aluminum flexible duct to the 5"
adapter. Tape all joints with duct tape.
Fig. 8
4. Assemble the recirculation plenum to
the flexible duct. Fig. 8
5. Drill three (3) 1/16" diameter equally
spaced holes through the duct and duct
connector of the recirculation plenum.
Fig. 8
6. Secure duct to the plenum's connector
with (3) sheet metal screws. Tape all joints
with duct tape. Fig. 8
7. Secure the electrical system plate to the
range hood with (3) mounting screws.
Fig. 9
12" if ceiling height
PLUS
is 9-feet
(3) SCREWS
5" ALUMINUM
FLEX DUCT
5" 6" ADAPTER
BLOWER
COLLAR
3.9x9.5mm
SCREWS
- 11 -
Length of
=
compressed
flexible alumi-
num ductwork
PLENUM
ELECTRICAL
SYSTEM
FIG. 8
PLATE
FIG. 9