4
E
4. Hood Exhaust Duct
When the hood is vented to the outside, a hood exhaust duct
is required. All ductwork must be metal; absolutely do not use
plastic duct. Check that all connections are made securely.
Please read the following carefully:
Exhaust Connection:
The hood exhaust has been designed
to connect to a standard 3
1
/
4
” x 10” rectangular duct. If round
duct is required, a rectangular-to-round adapter must be used.
Rear Exhaust:
If a rear or horizontal exhaust is to be used,
care should be taken to align the exhaust with the space
between the studs, or wall should be prepared at the time it
is constructed by leaving enough space between wall studs
to accommodate exhaust.
Maximum Duct Length:
For satisfactory air movement, the
total duct length of 3
1
/
4
” x 10” rectangular or 6” diameter round
duct should not exceed 140 feet.
Elbows, adapters, wall, roof caps, etc. present additional
resistance to air flow and are equivalent to a section of straight
duct which is longer than their actual physical size. When
calculating the total length, add the equivalent lengths of all
transitions and adapters plus the length of all straight duct
sections. Figure 4 shows the approximate feet of equivalent
length of some typical ductwork parts.
Use the values in parentheses for calculating air flow
resistance equivalent, which should total less than 140 feet.
Figure 4
5. Tools Recommended for
Installation
• Phillips Screwdriver
• Electric Drill
• Scissors
• Saw to cut exhaust
opening (if needed)
• 1
1
/
2
” Wood Bit or Metal
Hole Cutter (if metal
cabinet is used)
• Pencil
• Measure
• Tape
•
1
/
2
”,
5
/
8
” and
3
/
32
”
Drill Bits
• Protective Drop Cloth
for product and range—
you may also use
carton for protection
6. Installation Hardware
The following is a list of parts you may need for installing
your Built-In Microwave Hood. You will find the installation
hardware contained in a packet with the unit. Check to make
sure you have all these parts. Use this time to become familiar
with each piece. Available for purchase at Encompass.com.
ITEM
PART NAME & CODE
QTY
1
Lag screws (
1
/
4
” x 1.8”)
9KC7117604511
2
2
Toggle Bolts and Nuts
3
/
16”
x 2.7”
9KC3516003200, 9KC3516003300
2
3
Cabinet Mounting Bolts
1
/
4
” x 3
1
/
8
”
9KC7045607011
2
4
Washer (
3
/
4
”) 9KC3516003100
2
5
Nylon Grommet (for metal cabinets)
9KC3517503200
1
6
Damper 9KC3515400500
1
7
Mounting Plate 9KC351060009300
1
Figure 5
7. Ventilation System
This Built-In Microwave Hood is designed for adaptation
to three types of hood ventilation systems. Select the type
required for your installation.
A. Recirculating
Non-Vented, Ductless Operation
The unit is shipped assembled for recirculating.
NOTE:
1. The Exhaust Damper Assembly is not required for
recirculating operation.
2. The Charcoal Filter should be replaced every 6 months,
depending on use.
3. The Charcoal Filter is also sold as an accessory. See Use
and Care Manual for ordering information.
