13
INSTALLATION IN EXISTING CONSTRUCTION (
CONT
'
D
)
INSTALLING THE INLET TUBING (
CONT
'
D
)
L
OCATING
A
TTIC
A
CCESS
H
OLES
Drill the access holes directly above the inlet location. To
accurately locate the access hole, you must find the space
between wall studs where the inlet is to be located. Observe the
area around the inlet location. Look for references you might be
able to find in the attic: electrical wiring, ductwork, doorways,
etc. Measure and note the distance from these references to
the inlet location.
Enter the attic and find the inlet wall. Have a helper downstairs
knock on the top of the wall right above the inlet location; locate
the general area by following the sound. Most likely, you will
have to clear away insulation. Ask your helper to continue
knocking until you locate the area between wall studs directly
above the inlet location.
Next, measure the
thickness of the wall. Mark
the exact center of the wall
where you will drill the
access hole. Remember
that the access hole must
be placed exactly in the
center of the wall.
L
OCATING
B
ASEMENT
A
CCESS
H
OLES
To locate access holes in
the basement, remove the
toe molding or baseboard
at the base of the inlet
wall. Carefully loosen the
molding or baseboard
by inserting the blade of
a putty knife behind it.
Force another putty knife
between the first knife
and the baseboard or
wall. Gently hammer a
cold chisel between the
two knife blades, prying the loosened molding away from the
baseboard or the baseboard away from the wall.
Directly below the inlet
location, drill a 1/16”
reference hole through the
floor into the basement.
(If you’re drilling through
carpet, use an awl to
slightly open the weave.
This will keep the carpet
from wrapping itself around
the drill bit.) Insert a piece
of scrap wire or a clothes
hanger into the reference
hole so you can easily find
the hole in the basement.
Once you’ve found the location in the partition wall, you must
center the access hole in the middle of the wall. Measure half
the thickness of the wall and mark the center of the wall where
you will drill the access hole. If you cannot see the plate, you
can determine this measurement from upstairs. At the nearest
doorway, measure the thickness of the wall, including the
baseboard.
In the basement measure a distance equal to half the thickness
of the wall, using the reference hole as a starting point.
D
RILLING
THE
A
CCESS
H
OLES
Once you are certain that
you’ve located the center
of the wall directly above
the inlet location, use a
2½” hole saw to cut the
access hole through the wall
plate or header and into
the wall cavity. (A 1/2” drill
is recommended.) Remove
the drill from the hole
carefully.
Now, use a flashlight to
inspect the wall cavity
through the access hole.
Make sure no hidden
obstacles will interfere
with the tube installation.
(If this inspection reveals
an obstacle, find a new
inlet location.) Repeat this
procedure in your attic
or basement until your
access holes are drilled.
A
SSEMBLING
THE
I
NLET
T
UBING
Once you’ve drilled the access holes, you assemble the inlet
tubing and insert it into the wall cavity. Refer to “Working With
Plastic Tubing” on pages 5-6 before you begin to assemble the
inlet lines.
Select a section of plastic
tubing and an 8” section
of the flexible inlet tubing.
Apply cement to the
outside of the plastic
tubing and to the inside of
the flexible tubing. Join the
two pieces together and
allow 5 minutes for them
to dry.
AR0021A
Wall Plate
Drywall
Drywall
AR0022
AR0023
AR0024
AR0025
AO0013
