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Venting requirements
Venting system must terminate to the
outside.
Do not terminate the vent in an attic or
other enclosed space.
Do not use four-inch laundry-type wall
caps.
Do not use plastic vent.
Vent system needed for installation is not
included.
It is recommended that the wall or roof cap
used have a backdraft damper. If it does,
remove the damper from the range hood
exhaust connection supplied with the hood.
Determine which outside venting method
you need to use.
The length of the vent system and number
of elbows should be kept to a minimum to
provide efficient performance. The size of
the vent system should be uniform. Do Not
install two elbows together. Use duct tape
to seal all joints in the vent system. Vent
system can terminate either through the
roof or wall. Use caulking to seal exterior
wall or roof opening around exhaust hood.
For the most efficient and quiet operation, it
is recommended that the range hood be
vented vertically through the roof using 7"
round vent system.
Flexible metal vent is Not recommended. If it
is used, calculate each foot of flexible
metal vent as two feet of straight metal
vent. Flexible metal elbows count twice as
much as standard elbows. Use metal
ventwork only.
Figures 1-4 show common venting methods
and what types of materials are needed.
Vertical roof venting
7" round
through roof
damper located
as far from hood
as possible
66"
Figure 1
Vertical roof venting
3-1/4" x 10"
through the roof
66"
Figure 2
Panel B
Horizontal wall venting
3-1/4" x 10"
through the wall
66"
Recommended roof venting
7" min. diameter
round vent
3-1/4" x 10" to round
vent transition
Recommended vent system lengths
for venting an electric indoor grill
Indoor electric grills produce more smoke
than normal cooking and require at least
410 CFM to provide adequate ventilation.
Horizontal wall venting
roof cap
Use maximum of two feet of 3-1/4" x 10"
vent with a wall cap and a free discharge
area of 66 square inches. There should be
no elbows in vent system between range
hood and wall cap.
Vertical roof venting
Use maximum of four feet of 3-1/4" x 10"
vent terminating with a roof cap and with
a free discharge area of at least 66 square
inches.
If longer vent system is required, the
shortest possible ventwork length should be
used to ensure the maximum CFM of air
movement for best venting. A transition to
round must be used as close to the hood
as possible to eliminate the restriction
caused by 3-1/4" x 10" vent. 45° elbows
should be used instead of 90° elbows
wherever possible. A roof cap providing a
free area of 113 square inches is
recommended.
Check the length of vent system used with
lengths given in the chart to make sure
roof cap
vent system length does not exceed static
pressure of .25.
Static pressure vs. vent system length
Static
pressure
.06
.10
3-1/4" x 10"
.15
damper
.20
.25
90° elbow
45° elbow
wall cap
Figure 3
roof cap
Figure 4
Equivalent vent system length (f t.)
CFM
3-1/4" x 10"
7" dia.
8" dia.
9" dia.
460
10
19
4
440
17
31
7
417
11
25
47
390
15
33
62
111
355
18
42
78
5
11
12
5-1/2
6
2-1/2
Now start...
With range hood in kitchen.
Slide cardboard or hardboard under range
before moving range across floor to
prevent damaging floor covering.
Cover countertop, cooktop or set-in range
with a thick, protective covering to prevent
damaging countertop.
1.
Determine which venting method,
roof or wall hood venting, you
need to use. The range hood comes
shipped for venting through the roof.
2.
Disconnect and move
freestanding range from cabinet
opening to provide easier access to upper
cabinet and rear wall. Put a thick,
protective covering over cooktop, set-in
range or countertop to protect from
damage or dirt. A protective covering will
also be needed to set range hood on while
getting it ready for installation.
3.
Determine and clearly mark a
vertical centerline on the wall and
cabinet in the area the vent opening will
be made.
7-1/2"
4.
To wire through top, mark a line
7-1/2" from the right of the
centerline on the underside of the cabinet.
Mark the point on this line that is 1-3/8" from
back wall. Drill a 1-1/4" diameter hole
through the cabinet at this point. Note: If a
cord-connection kit is used, drill a 1-5/8"
diameter hole.
34
56
83
14
7
To wire through rear, mark a line 7-1/2" from
the right of the centerline on the wall. Mark
the point on this line that is 1-3/8" from
underside of cabinet. Drill a 1-1/4" diameter
hole through wall at this point.
centerline
centerline
1-3/8"
(from
wall)
centerline
1-3/8"
7-1/2"
centerline
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