8
Pre-Installation (continued)
For back venting:
□
Cut one square hole (10) with a width of 260 mm
(10 .24 in .) and a depth of 100 mm (3 .94 in .) in the back
wall . Center the hole on the center line (12) of the cabinet
and place it 10 mm (0 .37 in .) below the cabinet .
□
Cut one circular hole (11) of a diameter of 32 mm (1 .26 in .)
in the back wall . Place its center 285 mm (11 .22 in .) from
the center line (12) of the cabinet and 20 mm (0 .79 in .)
from the bottom of the cabinet .
6 . Follow these guidelines when installing duct work:
□
Your venting system must vent to the outdoors either
horizontally through the back wall (13) or vertically through
the roof (14) .
□
Use round metal duct work with a uniform diameter of
150 mm (6 in .) . The total duct run in the venting system
should be at least 5 .79 m (19 ft) and not more than
10 .7 m (35 ft) .
□
Fasten all connections between pieces of duct with sheet
metal screws, and tape all joints with certified duct tape .
□
If you must turn the path of the duct work using elbows,
keep the number of elbows to a minimum for effective
performance and use no more than three 90° elbows .
Ensure that there is a minimum of 457 mm (18 in .) of
straight vent between each elbow . Elbow as far away from
the range hood’s exhaust opening as possible .
□
Cap the exterior of the duct with a wall cap (15) or roof
cap (16) . Never use 102 mm (4 in .) laundry-type wall caps .
Use caulking to seal exterior wall or roof opening around
the cap .
□
The venting system must have a damper . If the roof or wall
cap has a damper, do not use the damper (B) supplied with
the range hood (A) .
□
Calculate the length of the duct work by adding the lengths
in the table to the right for each piece of duct in the
system .
12
8
9
Top Venting Option
Back Venting Option
12
10
11
13
15
Vertical Roof Venting
Horizontal Wall Venting
14
16
Type of duct
length added
45° Elbow
914 mm (36 in .)
90° Elbow
1 .52 m (5 ft)
90° Flat elbow
3 .66 m (12 ft)
2 .74 m (9 ft) Straight duct
2 .74 m (9 ft)
