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.......................................................................................Installation instructions
NOTE: If you need to install ducts, note that the total
duct length of' 3W' x t0" rectangular or 6" diameter'
round duct should not exceed 140 equivalent feet°
Outside ventilation requires a HOOD EXHAUST DLtCT
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 _,dng freely ,and
nothing is blocking the ducts.
Exhaust connection:
The hood exhaust has been designed to mate with
a standard 3i/t" x 10" rectangular duct,
If a round duct is required, a rectangular_to-round
transition adapter' must be used. Do not use less than
a 6" diameter duct,
Maximum duct length:
For satisfactory air movement, the total duct length of
3I/1" x I0" 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
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 ductwor k length using the approximate feet
of equivalent length of some typical ducts,
EQUIVALENT NUMBER
DUCT PIECES LENGTH x USED =
Rectangular4o-Round 5 Ft
TransitionAdapter*
_ Wall Cap 40Ft
........... I ................
(_ 90° Elbow 10Ft x ( )
45° Elbow 5Ft x ( )
90° Elbow 25Ft x ( ) =
J 45° Elbow 5Ft x ( )
RoofCap
24 Ft x ( )
w
EQUIVALENT
LENGTH
x { ) = Ft
x ( ) = Ft
= Ft
= Ft
Ft
= Ft
= Ft
StraightDuct6" Roundor t Ft x ( ) = Ft
3Vg'x 10"Rectangular
Total Ductwork = Ft, :,
Q "7 *rMPORTANT:lra rectangular-to-round transition Equivalent lengths or duct pieces are based on actual tests
_ adapter is used, the botto_n corners of the damper and reflect reqmrements for good venting performance with
....__ *viii have to be cut to fit, using the tin snips, in order any vent hood
..,..__," to allow free movement of the damper
5
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