Installation guide
Installation
Instructions
NOTE:
If
you
need
to
install
ducts,
note
that
the
total
duct
length
of
3%”
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
3%”
x
10”
rectangular
duct.
lf
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
3Y0”
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.
will
have
to
be
cut
to
fit,
using
the
tin
snips,
in
order
to
allow
free
movement
of
the
damper.
EQUIVALENT
NUMBER
EQUIVALENT
DUCT
PIECES
LENGTH
x
USED
=
LENGTH
Rectangular-to-Round
5
Ft.
x
{ }
=
Ft.
Transition
Adaptor*
T_)
Wall
Cap
40
Ft.
x
{ )
=
Ft.
OD
90°
Elbow
10
Ft.
X
( )
=
Ft.
Q
45°
Elbow
5
Ft.
X
( )
=
Ft.
CE
90°
Elbow
25
Ft
x
()
-
Ft
FA
45°
Elbow
5
Ft.
x
( )
=
Ft.
WES.
Root
Cap
24
Ft
x
(
-
Ft
Straight
Duct
6”
Round
or
1
Ft.
x
{ }
=
Ft.
3%”
x
10”
Rectangular
Total
Ductwork
=
Ft.
*
IMPORTANT:
If
a
rectangular-to-round
transition
Equivalent
lengths
of
duct
pieces
are
based
on
actual
tests
and
>
adaptor
is
used,
the
bottom
corners
of
the
damper
reflect
requirements
for
good
venting
performance
with
any
vent
hood.