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DRYER
VENTING
REQUIREMENTS
If
an
Exhaust
Hood
Cannot
be
Used
The
outside
end
of
main
vent
shouid
have
a
sweep
eibow
directed
downward.
If
main
vent
travels
vertically
through
the
roof,
rather
than
through
wall,
install
a
180°
sweep
elbow
on
end
of
vent
at
least
2
ft.
(610
mm)
above
surface
of
roof.
The
opening
in
wall
or
roof
shall
have
a
diameter
1/2"
(13
mm)
larger
than
vent
diameter.
Vent
should
be
centered
in
opening.
Do
not
install
screening
over
end
of
vent
for
best
performance.
Multiple
Dryer
Venting
A
main
vent
can
be
used
for
venting
a
group
of
dryers.
The
main
vent
should
be
sized
to
remove
200
CFM
of
air
per
dryer.
Large-capacity
lint
screens
of
proper
design
may
be
used
in
main
vent
if
checked
and
cleaned
frequently.
The
room
where
the
dryers
are
located
should
have
make-up
air
equal
to
or
greater
than
CFM
of
all
the
dryers
in
the
room.
Back-draft
Damper
Kit,
Part
No.
3391910,
is
available
from
your
distributor
and
should
be
installed
in
the
vent
of
each
dryer
to
keep
exhausted
air
from
returning
into
dryers
and
to
keep
exhaust
in
balance
within
main
vent.
Unobstructed
return
air
openings
are
required.
Each
vent
should
enter
the
main
vent
at
an
angle
pointing
in
the
direction
of
the
airflow.
Vents
entering
from
the
opposite
side
should
be
staggered
to
reduce
the
exhausted
air
from
interfering
with
the
other
vents.
The
maximum
angle
of
each
vent
entering
the
main
vent
should
be
no
more
than
30°.
17
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