Plywood backing
The majority of the weight of the in- stalled 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 re- quired locations, a plywood backing (min. 1/2" (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, pro- ceed to the included installation sheet.)
To install a plywood backing
^Determine and mark the location of the retaining plate for the canopy as outlined on the installation sheet.
^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.
Be careful not to damage any wiring or plumbing that may be located be- hind the wall. Make sure that the power supply to the area where this installation is being performed has been turned off at the breaker panel before cutting into the wall.
^Remove the drywall between the cut-
ting lines and replace it with plywood of a matching thickness (min. 1/2" (13 mm) thick). Tape the joints and refinish the wall.
^Proceed to the included installation sheet to complete the installation.
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