GE JVM1430 Installation Instructions Manual page 5

Installation Instructions
NOTE: If you need to install ducts, note that the total
duct length of 3VY x 10" rectangular or 6" diameter
round duct should not exceed 140 equivalent feet.
Outside ventilation requires a HOOD EXHAUST
DU(T. Read the folloxdng careflflly.
NOTE: It is important that venting be installed using
the most direct route and with as ti_w 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 hood exhaust has been designed to mate with a
standard 3V/' 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.
Maximum duct length:
For satisth{to D air movement, the total duct length of
3_/_ " x 10" rectangular or 6" diameter round duct should
not exceed 140 equivalent feet.
Elbows, transitions, wall and roof caps,
etc.,
present additional resistance to airflow and are
equiwdent 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 duowork length using the
approximate tibet of equivalent length of some typical
ducts.
EQUIVALENT NUMBER EQUIVALENT
DUCT PtECES LENGTH x USED = LENGTH
Rectangular-to-Round 5 Ft. x ( } = Ft.
TransitionAdapto¢
Wail Cap 40 Ft. x { ) = Ft.
()_ go °Elbow 10 Ft. x ( ) = Ft.
{_ 45° Elbow 5 Ft. x ( ) = Ft.
90 ° Elbow 25 Ft. x ( ) = Ft.
45° Elbow 5 Ft. x ( ) = Ft.
RoofCap 24 Ft. x ( ) = Ft.
StraightDuct6" Roundor 1 Ft. x ( ) = Ft.
3W* x 10" Rectangular
Total Ductwork = Ft.
* IMPORTANT: lla r_'__lan_ular-I()-l-()ulld tl-ansiti()n E( uivalent 1( nNhs of dllcl 1)i¢ (:€s arc based ()i1 actual tcsls
adaplor is used, th( botlom Corners of the dam )(r and r_ l'lecI te( Uirements lbr good vc n/ing perlormance with
will have Io be cut to fil, using the tin snips, in order anx vent hood.
to all{*_ free moxement of th_ damper.
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