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Installation
Instructions
NOTE: If you need to install ducts, note that the total
duct length of 31/_'' x 10" rectangular
or 6" diameter
round duct should
not exceed
140 equivalent
feet.
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.
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
3W' 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 satisfactory
air movement,
the total duct length of
3W' 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 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 ducts.
DUCT PIECES
O
Rectangular-to-Round
Transition
Adaptor*
Wall Cap
90 ° Elbow
45 ° Elbow
90 ° Elbow
45 ° Elbow
Roof Cap
EQUIVALENT
LENGTH
5 Ft.
40 Ft.
10 Ft.
5 Ft.
25 Ft.
5 Ft.
24 Ft.
NUMBER
x
USED
x
()
x
()
x
()
x
()
x
()
x
()
x
()
EQUIVALENT
=
LENGTH
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Straight
Duct 6" Round or
3W'x
10" Rectangular
1 Ft.
x
( )
Ft.
Total Ductwork
Ft.
* 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.
Equivalent
lengths of duct pieces are based on actual
tests and reflect requirements
for good venting
performance
with any vent hood.
5
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