4.
UNIT INSTALLATION
(CONT’D)
4.5 P
LANNING OF THE
D
UCTWORK
• K
eep
it
simple.
Plan
for
a
minimum
of
bends
and
j
oints.
K
eep
the
length
of
the
insulated
ducts
to
a
minimum.
•
Do
not
use
wall
cavities
as
ducts.
Do
not
use
branch
line
smaller
than
4” (
102
mm
)
diameter.
•
Do
not
ventilate
crawl
spaces
or
cold
room.
Do
not
attempt
to
recover
the
e
x
haust
air
from
a
dryer
or
a
range
hood
;
this
will
cause
the
clogging
of
the
unit.
•
Be
sure
to
plan
at
least
one
e
x
haust
register
on
the
highest
lived
-
in
level
of
the
house,
if
it
has
2
floors
or
more.
4.6 I
NSTALLING
N
ON
-I
NSULATED
F
LEXIBLE
D
UCTS AND
R
EGISTERS
4.6.1 S
TALE
A
IR
E
XHAUST
D
UCTWORK
4.6.2 F
RESH
A
IR
D
ISTRIBUTION
D
UCTWORK
CAUTION
If ducts have to go through an unconditioned space, always use insulated
ducts (purchase separately).
WARNING
Never install a stale air exhaust register in a room where a combustion
device operates, such as a gas water heater, a gas furnace or a fireplace.
0
!
• I
nstall
the
stale
air
e
x
haust
register
(
s
)
in
the
main
area
where
the
contaminants
are
produced
: k
itchen,
living
room,
etc.
Position
the
register
(
s
)
as
far
from
the
stairway
as
possible
and
in
such
a
way
that
the
air
circulates
in
all
the
lived
-
in
spaces
in
the
house.
• I
f
a
register
is
installed
in
the
k
itchen,
it
must
be
located
at
least
4
feet
(
1.2
m
)
from
the
range.
• I
nstall
the
register
(
s
) 6
to
12
inches
(
152
to
305
mm
)
from
the
ceiling
on
an
interior
wall
O
R
install
it
in
the
ceiling.
• I
nstall
the
fresh
air
distribution
register
(
s
)
in
a
large,
open
area
in
the
lowest
level
to
ensure
the
greatest
possible
air
circulation.
K
eep
in
mind
that
the
fresh
air
register
(
s
)
must
be
located
as
far
as
possible
from
the
stale
air
register
(
s
)
.
• I
nstall
the
register
(
s
)
in
the
ceiling
O
R
6
to
12
inches
(
152
to
305
mm
)
from
the
ceiling
on
an
interior
wall.
The
duct
length
should
be
at
least
15 feet
(4
.
6
m
)
.
(
The
cooler
air
will
then
cross
the
upper
part
of
the
room
and
mi
x
with
room
air
before
descending
to
occupant
level.
)
4.6.3 H
OW TO
C
ONNECT
N
ON
-I
NSULATED
F
LEXIBLE
D
UCTS TO THE
R
EGISTERS
• O
nce
the
register
location
is
determined,
cut
out
a
3
¾” x
9
¾”
rectangular
hole.
• F
i
x
one
end
of
the
fle
x
ible
duct
to
the
register
transition
(
1
)
,
using
a
tie
wrap
and
duct
tape.
• F
rom
inside
the
wall
(
or
ceiling
)
,
place
the
transition
opening
flush
to
the
finished
wall.
•
Assemble
the
register
(
2
)
to
its
transition
using
its
2
no.
8
x
1
½”
screws.
See
illustration
beside.
VD0202
1
2
9
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