GE JVM3160RFSS Installation Instructions - Page 6

Exhaust connection, Elbows, transitions, wall and roof caps, etc. - installation

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Installation Instructions NOTE: If you need to install ducts, note that the total duct length of 31ø4s x 10s rectangular or 6s diameter round duct VKRXOGQRWH[FHHGHTXLYDOHQWIHHW Outside ventilation requires a HOOD 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. $OVRPDNHVXUHGDPSHUVVZLQJIUHHO\DQG QRWKLQJLVEORFNLQJWKHGXFWV Exhaust connection: The hood exhaust has been designed to mate with a standard 31ø4s x 10s rectangular duct. If a round duct is required, a rectangular-to-round transition adaptor must be used. Do not use less than a 6s diameter duct. 0D[LPXPGXFWOHQJWK For satisfactory air movement, the total duct length of 31ø4s x 10s rectangular or 6s diameter round duct should QRWH[FHHGHTXLYDOHQWIHHW 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 adaptors 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 duct pieces. DUCT PIECES EQUIVALENT LENGTH x NUMBER USED EQUIVALENT = LENGTH Rectangular-to-Round 5 Ft. x ( ) = Ft. Transition Adaptor* Wall Cap 40 Ft. x ( ) = Ft. 90° Elbow 10 Ft. x ( ) = Ft. 45° Elbow 5 Ft. x ( ) = Ft. 90° Elbow 25 Ft. x ( ) = Ft. 45° Elbow 5 Ft. x ( ) = Ft. Roof Cap 24 Ft. x ( ) = Ft. Straight Duct 6s Round or 1 Ft. x ( ) = Ft. 31ø4s x 10s Rectangular * IMPORTANT: If a rectangular-to-round transition adaptor 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. 7RWDO'XFWZRUN    )W Equivalent lengths of duct pieces are based on actual tests and reflect requirements for good venting performance with any vent hood. 6

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EQUIVALENT
NUMBER
EQUIVALENT
DUCT PIECES
LENGTH
x
USED
=
LENGTH
Rectangular-to-Round
5 Ft.
x
(
)
=
Ft.
Transition Adaptor*
Wall Cap
40 Ft.
x
(
)
=
Ft.
90° Elbow
10 Ft.
x
(
)
=
Ft.
45° Elbow
5 Ft.
x
(
)
=
Ft.
90° Elbow
25 Ft.
x
(
)
=
Ft.
45° Elbow
5 Ft.
x
(
)
=
Ft.
Roof Cap
24 Ft.
x
(
)
=
Ft.
Straight Duct 6
Round or
1 Ft.
x
(
)
=
Ft.
3
1
4
x 10
Rectangular
Equivalent lengths of duct pieces are based on actual tests and
reflect requirements for good venting performance with any vent
hood.
6
*
IMPORTANT:
If a rectangular-to-round transition
adaptor 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
.
NOTE:
If you need to install ducts, note that the total duct
length of 3
1
4
x 10
rectangular or 6
diameter round duct
Outside ventilation requires a HOOD 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.
Exhaust connection:
The hood exhaust 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 adaptor must be used.
Do not use less than
a 6
diameter duct.
For satisfactory air movement, the total duct length of
3
1
4
x 10
rectangular or 6
diameter round duct
should
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 adaptors 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
duct pieces.
Installation Instructions