Ventamatic CX36BD2SPD - Manual (Page 5)

-5-
FACING INSTALLATION
The facing will be square, with the
inside dimension measuring the
same distance as the shortest
dimension of the shutter rough
Opening (i.e., 26-inches for a 24-in
model, etc.).
The facing will sit over the hole in
the ceiling and support the fan assembly. Once your square is built, nail or screw the facing to the framed
opening.
TIP: If doing a joist-out installation, use the lumber from the support pieces as the long cuts of the facing.
Use the removed joists as the short cuts.
TIP: For a quieter fan, build a second box frame the same size as the fan frame and install it between the
facing and the fan. Ensure a minimum of 36-in clearance between fan blades and attic roof.
CUT THE CEILING JOIST (SKIP THIS STEP IF YOU ARE USING THE JOIST-IN METHOD.)
BEFORE cutting the ceiling joists, it is best to stabilize the joists from
which you are removing a section. Using 2 x 6 lumber, form a bridge
across the joist on either side of the opening. This step will give extra
support to the joist, as you cut it, and will also help prevent the drywall
from cracking.
Place the bridge pieces about 6 inches in from the sides of the shutter
opening, allowing enough room for the safe use of a hand or power
saw. Nail the stabilizers to the joists with #12D nails, or use 2 ½-in
deck screws for greater ease of
removal.
Mark the cut lines on the section of joist to be cut. These should be 1½-
in outside the edges of the shutter opening (to allow for the framing of
the opening). Be certain that the cut lines are square (perpendicular to
the joist) so that you will be able to fit the headers tightly against the joist
and the shutter opening. After carefully measuring and marking each cut
line, cut the joists with a saber saw.
FRAME THE SHUTTER OPENING
Use lumber that is of the same
dimension as your ceiling joists and
#12D common nails. On the ceiling
side of the installation fasten the
sheetrock around the edges of the
framed opening. Use 1 ½-in ring
shank drywall nails.
Remove the two bridges across the ceiling joists. Save this lumber to build the facing around the framed
shutter opening.
*Note* Any gaps between the headers and the joists should be sealed with caulk or foam insulation
to enable your fan to draw properly.