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1211
External Exhaust Ducting
External Exhaust Ducting
INSTALLATION
INSTALLATION
EQUIVALENT NUMBER EQUIVALENT
DUCT PIECES
LENGTH
x
USED
=
LENGTH
Rectangular-to-Round 5 Ft. (1.5 m) x ( ) = Ft. or m
Transition Adapter*
Wall Cap 40 Ft. (12.2 m) x ( ) = Ft. or m
90° Elbow 10 Ft. (3 m) x ( ) = Ft. or m
45° Elbow 5 Ft. (1.5 m) x ( ) = Ft. or m
90° Elbow 25 Ft. (7.6 m) x ( ) = Ft. or m
45° Elbow 5 Ft. (1.5 m) x ( ) = Ft. or m
Roof Cap 24 Ft. (7.3 m) x = Ft. or m
1 Ft. (0.3 m) x = Ft. or m
Straight Duct 6“ Round or 3
1/4" x 10“ Rectangular)
Total Ductwork = Ft. or m
Equivalent lengths of duct pieces are based on actual tests
and reflect requirements for good venting performance with
any vent hood.
* IMPORTANT: If a rectangular-to-round transition
adapter is used, the bottom corners of the damper
will have to be cut to fit, using the tin snips, in order
to allow free movement of the damper
.
Maximum duct length:
For satisfactory air movement, the total duct length of 3
1/4" x 10” rectangular or 5” diameter/6” diameter
round duct should not exceed 120 equivalent feet.
Elbows, transitions, wall and roof caps, etc.
present additional resistance to airflow and are
equivalent to a section of straight duct which is longer
than their actual physical size. When calculating the total
duct length, add the equivalent lengths of all transitions
and adapters plus the length of all straight duct sections.
The chart below shows you how to calculate total
equivalent ductwork length using the approximate feet of
equivalent length of some typical ducts.
INSTALLATION INSTRUCTIONS FOR EXTERNAL EXHAUST DUCTING
NOTE: If you need to install ducts, note that the total duct
length of 3 1/4" x 10” rectangular or 5” diameter/ 6”
diameter round duct should not
exceed 120 equivalent feet.
Outside ventilation requires an EXTERNAL EXHAUST
DUCT. Read the following carefully.
NOTE: It is important that venting be installed using
the most direct route and with as few elbows as possible.
This ensures clear venting of exhaust and helps prevent
blockages. Also, make sure dampers swing freely and
nothing is blocking the ducts.
Exhaust connection:
The exhaust adapter has been designed to mate with
a standard 3 1/4" x 10” rectangular duct.
If a round duct is required, a rectangular-to-round
transition adapter must be used. A 5 ”/ 6” diameter
duct is acceptable to use.
( )
( )
EQUIVALENT NUMBER EQUIVALENT
DUCT PIECES
LENGTH x USED
= LENGTH
Roof Cap 24 Ft. (7.3 m) x (1) = 24 Ft. (7.3 m)
x (1) = 12 Ft. (3.6 m)
12 Ft. Straight Duct 12 Ft. (3.6 m)
(6” Round)
Rectangular-to-Round 5 Ft. (1.5 m) x (1) = 5 Ft. (1.5 m)
41 Ft. (12.4 m)
Transition Adapter*
Equivalent lengths of duct pieces are based on actual tests and
reflect requirements for good venting performance with any vent hood.
Total Length =
The following chart describes an example of one possible ductwork installation.
OUTSIDE TOP EXHAUST (EXAMPLE ONLY)
NOTE: For back exhaust, care should be taken to align exhaust with space between studs, or wall should be prepared
at the time it is constructed by leaving enough space between the wall studs to accommodate exhaust.
* IMPORTANT: If a rectangular-to-round transition adapter is used, the bottom corners of the damper
will have to be cut to fit, using the tin snips, in order to allow free movement of the damper.
The following chart describes an example of one possible ductwork installation.
OUTSIDE BACK EXHAUST (EXAMPLE ONLY)
EQUIVALENT NUMBER EQUIVALENT
DUCT PIECES LENGTH* x USED = LENGTH
Wall Cap 40 Ft. (12.2 m) x (1) = 40 Ft. (12.2 m)
3 Ft. (0.9 m) x (1) = 3 Ft. (0.9 m)3 Ft. Straight Duct
(3 1/4" x 10” Rectangular)
90° Elbow 10 Ft. (3 m) x
(2)
20 Ft. (6 m)
Equivalent lengths of duct pieces are based on actual tests and
reflect requirements for good venting performance with any vent hood.
Total Length =
63 Ft. (19.1 m)
EXTERNAL EXHAUST DUCTING
=
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