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Installation
Instructions
INSTALLATION
INSTRUCTIONS
FOR EXTERNAL EXHAUST
DUCTING
NOTE: If
you
need
to install
ducts,
note
that
the
total
duct
length
of 31/4" x 10" (8.2
x 25.4
cm)
rectangular
or
5" (10.5
cm) diameter/
6" (15.2
cm)
diameter
round
duct
should
not
exceed
120
equivalent
feet
(36.5
m).
Outside
ventilation
requires
a
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
adaptor
has
been
designed
to mate
with
a standard
31/4'' x 10"
(8.2 x 25.4
cm)
rectangular
duct.
If a round
duct
is required,
a rectangular-to-round
transition
adaptor
must
be used.
Do
not
use
less
than
a 6" (15.2
cm)
diameter
duct.
Maximum
duct length:
For satisfactory air movement,
the total duct length of
31/4 '' x 10" (8.2 x 25.4 cm) rectangular
or 5" (10.5 cm)
diameter/6
"(15.2 cm) diameter
round duct should not
exceedl20
equivalent
feet (36.5 m).
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
phrs 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
&
J
@
0
J
Rectangular-to-Round
TransitionAdaptor*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
RoofCap
StraightDuct6" (15,2cm)
Roundor 31/4 ``x 10"
(8,2x 25,4cm)Rectangular
EQUIVALENT
LENGTH
5 Ft,(1,5m)
40 Ft, (12,2m)
10 Ft, (3 m)
5 Ft,(1,5m)
25 Ft, (7,6m)
5 Ft,(1,5m)
24 Ft, (7,3m)
1 Ft,(0,3m)
NUMBER
x
USED
x
()
x
()
x
()
x
()
x
()
x
()
x
()
x
()
Total Ductwork
EQUIVALENT
LENGTH
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft. or m
* 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
ti)r good
venting
pertbrmance
with
any vent
hood.
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