Page 4
STEP 1. After the installation site has been
selected for the fan, remove any insulation from the
area and select a ceiling joist to be the center line
of the fan.
Use the shutter carton to make a template for the
opening your shutter requires. (See above) FROM
THE ATTIC SIDE OF THE INSTALLATION SITE place
“CSS” SERIES SHUTTER INSTALLATION
Models CSS-24, CSS-30 & CSS-36, install on joists with 16
"
or 24
"
centers.
Model CSS-42 installs on 24” centers only.
CAUTION: DO NOT CUT THE SHUTTER OPENING
THE SAME SIZE AS THE FAN OPENING.
Use the shutter inside dimensions as shown in the
shutter specification chart below.
OPENING SIZES
- Installs centered on a joist with 16
"
or 24
"
centers.
Cut two openings, one on each side of center joist per shutter model:
Model
Fan Size
Outside Dimension
Opening Size
CSS-24
24
"
24
"
x 32
"
10
1
/
4
"
x 30
1
/
4
"
CSS-30
30
"
32
"
x 35
"
14
1
/
4
"
x 34
1
/
4
"
CSS-36
36
"
32
"
x 43
"
14
1
/
4
"
x 41
1
/
4
"
*
CSS-42 42
"
38
"
x 49
"
17
1
/
4
"
x 46
3
/
4
"
*
For 24
"
o.c. joists only
the template on the ceiling and against the joist that
will be the center of the fan. With a pencil trace
around the template. Repeat this procedure on the
exact opposite side of the joist. Drill a
1
/
4
"
hole at each
corner of the pencil lines. YOU SHOULD HAVE EIGHT
(8) HOLES. From directly below the attic, check to be
sure that the location is correct.
STEP 2. Return to the attic, and using a utility knife
or sheetrock saw carefully cut the shutter opening
following the pattern on both sides of the joist. (See
fig. 5).
DO NOT REMOVE THE SHEETROCK
FROM THE CENTER JOIST.
STEP 3. Frame the opening using lumber EQUAL
TO THE SIZE OF THE EXISTING JOISTS. (See fig. 6).
STEP 4. If the opening is less than the distance
between the joists, fasten supports between the new
framing along the edge of the opening. (See fig. 8.).
STEP 5. Remove the two (2) screws that secure the
fan frame to the plenum. Pass the fan and plenum into
the attic through the framed opening in the ceiling.*
Set them aside at this time.
Platform
New framing
Fig. 5
Fig. 6
Fig. 7
“CSS” SHUTTERS
*
If the fan does not fit through
the framed opening, use your
attic access opening. The current
building code requires this access
opening to be at least 22" x 30".
