Plywood backing
The majority of the weight of the installed ventilation system will be supported by the lower retaining plate. It must be firmly attached to the stud framing behind the drywall. If studs are not available in the required locations, a plywood backing (min. ½" (13 mm) thick) spanning at least two studs must be installed. Failure to adequately support the weight as stated may result in the ventilation system falling off the wall, causing personal injury and property damage.
(If plywood backing is not needed, proceed to the included "Installation diagram".)
To install a plywood backing
Determine and mark the location of the retaining plate for the canopy as outlined on the "Installation diagram".
Make a cutting line 3" (76 mm) above and 3" (76 mm) below the outline of the retaining plate.
Find the studs to the left and right of the mounting location by tapping the wall or using a stud finder.
Mark a vertical cutting line along the center of each stud.
CAUTION
When cutting or drilling into the wall or ceiling, do not damage electrical wiring and other hidden utilities.
Remove the drywall between the cutting lines and replace it with plywood of a matching thickness (min. ½" (13 mm) thick). Tape the joints and refinish the wall.
Proceed to the enclosed "Installation diagram" to complete the installation.
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