Ventamatic CX36BD2SPD - Manual (Page 4)

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TIP: Use the Whole House Fan box as a template to outline the opening and cut to the rough opening
shutter dimensions. Starting in the attic, place the template in the desired location and, using a
Phillips screwdriver, place a hole at each corner going through the ceiling. Next, place the template
inside the four holes on the ceiling and draw the cutout line around the template.
CUT THE SHUTTER OPENING
1. Cut through the ceiling along the lines
you have drawn, being careful not to
cut the joists. A circular saw may be
used with the shoe adjustment set to
a cutting depth equal to the depth of
the drywall.
2. Carefully remove the drywall from the
opening.
*Note* Make sure the exposed joint is
centered if you have chosen the joist-in
installation.
Joist-in Installation Joist-out Installation
1. Align the stationary shutter vein with the
ceiling joist located in the approximate center
of the shutter opening.
2. Draw a line on the ceiling marking the rough
opening size of the shutter frame.
3. Double-check the accuracy of the dimensions
you have marked and that all the corners are
square. 1. Drill two ¼-in holes (from the attic floor
down through the ceiling) at the two corners
that are aligned with one of the ceiling joists.
2. On the ceiling side, draw a straight line
between the two drilled holes. Using this line
as a guide, mark the other three sides of the
shutter opening, using the rough opening
dimensions in the chart above. Double-
check the accuracy of the dimensions you
have marked, and that all corners are square.
3. From the ceiling side, drill two more ¼-in holes
up into the attic at the remaining two corners.
PREPARE THE SHUTTER OPENING
Remove all insulation from the attic floor above the
installation site (be sure to take proper precautions — wear
gloves, goggles, and respirator mask). Select the correct
rough opening dimension from the chart.
*WARNING: USE THE SHUTTER ROUGH OPENING DIMENSIONS FROM THE CHART. DO NOT
USE THE DIMENSIONS OF THE FAN FRAME OR THE INSIDE SHUTTER DIMENSIONS.
FAN SIZE
24-in 28 x 26
30-in 29 ½ x 32 ¼
36-in 37 ½ x 34
SHUTTER ROUGH OPENING