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VENTING
DESIGN
SPECIFICATIONS
This
section
is
intended
for
architectural
designer
and
builder/contractor
reference
only.
NOTES:
gm
Vent
materials
needed
for
installation
are
not
provided
with
microwave
hood
combination.
We
do
not
recommend
using
a
flexible
metal
vent.
To
avoid
possible
product
damage,
be
sure
to
vent
air
outside,
unless
using
recirculation
installation.
Do
not
vent
exhaust
air
into
concealed
spaces,
such
as
spaces
within
walls
or
ceilings,
attics,
crawl
spaces
or
garages.
For
optimal venting
installation,
we
recommend:
mg
using
roof
or
wall
caps
that
have
back
draft
dampers
musing
a
rigid
metal
vent
m
using
the
most
direct
route
by
minimizing
the
length
of
the
vent
and
number
of
elbows
to
provide
efficient
performance
using
uniformly
sized
vents
using
duct tape
to
seal
all
joints
in
the
vent
system
mg
using
caulking
compound
to
seal
exterior
wall
or
roof
opening
around
cap
gm
not
installing
2
elbows
together,
for
optimal
hood
performance
If
venting
through
the
wall,
be
sure
that
there
is
proper
clearance
within
the
wall
for
the
damper
to
open
fully.
lf
venting
through
the
roof,
and
rectangular
to
round
transition
is
used,
be
sure
there
is
at
least
3"
(7.6
cm)
of
clearance
between
the
top
of
the
microwave
oven
and
the
transition
piece.
See
“Rectangular
to
Round
Transition”
illustration.
NS
Roof
venting
Roof
cap
cecereenell
DONO
Wall
venting
Wall
cap
Rectangular
to
Round
Transition
NOTE:
The
minimum
3"
(7.6
cm)
clearance
must
exist
between
the
top
of
the
microwave
oven
and
the
rectangular
to
round
transition
piece
so
that
the
damper
can
open
freely
and
fully.
~~
3"
(7.6
cm)
t
A.
Roof
cap
B.
6"
(15.2
cm)
min.
diameter
round
vent
C.
Elbow
(for
wall
venting
only)
D.
Wall
cap
E.3
14"
x
10"
to
6"
(8.3
x
25.4
cm
to
15.2
cm)
rectangular
to
round
transition
piece
F.
Vent
extension
piece,
at
least
3"
(7.6
cm)
high
Recommended
Standard
Fittings
The
following
length
equivalents
are
for
use
when
figuring
vent
length.
See
the
examples
in
“Recommended
Vent
Length.”
D
E F
G
A.
Rectangular
to
round
transition
piece:
3 44" x
10"
to
6"
=5
ft
(8.3
x
25.4
cm
to
15.2
cm
=
1.5
m)
B.
Roof
cap:
314"
x
10"
=
24
ft
(8.3
x
25.4
cm
=
7.3
m)
C.
90°
elbow:
34"
x
10"
=
25
ft
(8.3
x
25.4
cm
=
7.6
m)
D.
90°
elbow:
6"
=
10
ft
(15.2
cm
=3
m)
E.
Wall
cap:
3
14"
x
10"
=
40
ft
(8.3
x
25.4
cm
=
12.2
m)
F.
45°
elbow:
6"
= 5
ft
(15.2
cm
=
1.5
m)
G.
90°
flat
elbow:
314"
x
10"
=
10
ft
(8.3
x
25.4
cm=3
m)
11
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