Installation guide
Planning
the
Installation
WARNING
«To.
prevent-combustion
by-products,
smoke
or
odors
from
entering
the
home
and
to
improve
efficiency,
tape
all
duct
joints
securely.
«-
Use
only.duct
work
deemed
acceptable
by.
state,
municipal
and
local
codes.
«
-
Range
hoods.
may
interrupt:the
proper
flow:of
smoke
and
combustion
gases
from
furnaces,
gas
water
heaters-and
fireplaces.
To.avoid
drawing
lethal.gases
into.
the
home,
follow:the
manufacturer's.
recom-
mendation
for.
these
devices
and
consult
NFPA
and
ASHRAE
recommendations.
+...
Failure
‘to
install
a-remote
blower:
or
proper
duct:-work
may
result
in
a
back
draft
and/or.
the
insufficient
vent-
ing
of
smoke
and
fumes.
«
.-DO-NOT
install-an
additional
in-line
or-external
blow-
er
to
increase
the
length
of
the
duct:run.:Even
small
differences.
between
blower
air
flow-rates
can
greatly
reduce
the
air
draw
by
the
hood.
*
On
dual
exhaust
models,
the
two
8”
exhausts
may
be
merged
into
one
10”
duct
using
Dacor
transition
kit
AHT10.
See
page
16
for
details.
Calculating
the
Maximum
Duct
Run
Length
The
maximum
straight
duct
length
for
the
hood
is
deter-
mined
by
the
type
of
duct
used.
See
the
chart
below.
DUCT
SIZE
MAXIMUM
DUCT
RUN
8”
round
60
feet
10”
round
50
feet
3°”
X
10”
rectangular
50
feet
For
each
elbow
and
transition
added
to
the
duct
work,
a
certain
number
of
feet
must
be
subtracted
from
the
maxi-
mum
duct
run
to
compensate
for
wind
resistance.
To
deter-
mine
the
length
the
duct
work
cannot
exceed,
subtract
all
of
the
equivalent
lengths
of
the
elbows
and
transitions
listed
below
from
the
maximum
duct
run
above.
Duct
Work
Equivalent
Lengths
CAUTION
To
reduce
the
risk
of
fire
and
to
properly
exhaust
air,
be
sure.to.duct
air
outside
the
house.or-building.
Do-not
vent
exhaust-air
into
spaces.
within
walls
or
ceilings
or
into
attics,
crawl
spaces
or
garages.
All
duct
work
materials
(including
screws
and
duct
tape)
must
be
purchased
separately
by
the
customer.
When
planning
new
duct
work,
always
look
for
the
shortest,
most
direct
route
to
the
outside.
The
blower
assembly
can
be
rotated
to
accommodate
venting
(and
wiring)
through
the
top EN
or
the
back
EE.
eu!
y¢4
i
The
hood
exhaust
connects
to
an
8-inch
round
duct.
You
can
increase
the
duct
size
over
the
duct
run
if
desired.
To
prevent
a
back
draft,
never
decrease
the
duct
size
over
the
run.
If
existing
duct
work
is
smaller
than
8
inches
in
diameter,
remove
it
and
replace
it
with
8-inch
duct
work.
Do
not
rely
on
tape
alone
to
seal
duct
joints.
Fasten
ail
connections
with
sheet
metal
screws
and
tape
ail
joints
with
certified
silver
tape
or
duct
tape.
Use
sheet
metal
screws
as
required
to
support
the
duct
weight.
To
prevent
back-drafts,
a
damper
at
the
duct
outlet
may
also
be
required.
Make
sure
duct
work does
not
interfere
with
floor
joists
or
wall
studs.
EQUIVALENT
LENGTHS
Piece
Subtract
Piece
Subtract
8”
90°
elbow
7
feet
10”
90°
elbow
5
feet
8”
45°
elbow
3
feet
10”
45°
elbow
2
feet
3%"
X
10”
3%”
X
10”
to
to
round
90° 25
feet
8"/10”
round
4
feet
transition
transition
Roof
cap
‘
Wail
cap
with
‘
damper
*
The
equivalent
lengths
of
roof
and
wall
caps
vary
with
model
and
configuration.
For
equivalent
length,
contact
the
manufacturer
or
a
qualified
HVAC
specialist.
Duct
Work
Design
Tips
Wherever
possible,
reduce
the
number
of
transitions
and
turns
to
as
few
sharp
angles
as
possible.
Two
staggered
45°
angles
are
better
than
one
90°.
Keep
turns
as
far
away
from
the
hood
exhaust
as
possible,
and
as
much
space
between
bends
as
possible.
For
best
performance,
use
round
duct
instead
of
rectangu-
lar,
especially
when
elbows
are
required.
If
multiple
elbows
are
used,
try
to
Keep
a
minimum
of
24”
straight
duct
between
them.
Avoid
“S”
or
“back
to
back”
use
of
adjacent
elbows.
In
regions
where
the
weather
gets
extremely
cold,
use
ther-
mal
breaks,
such
as
a
short
section
of
non-metallic
duct,
to
avoid
indoor
heat
loss.
Locate
the
break
as
close
as
pos-
sible
to
the
outside
pass
through
point.
Do
not
use
flexible
metal
duct.
Do
not
use
duct
work
that
is
smailer
in
cross-sectional
area
than
the
recommended
types
above.
dacor
7