Plywood backing
The majority of the weight of the installed ventilation system will be supported by retaining plate A. 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.
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, proceed to "Attaching the retaining plates to the wall." )
To install a plywood backing board
^Make a mark, S + 16 3/4" (425 mm) above the cooktop and on the centerline.
^Make a second mark 12 3/4 "
(324 mm) underneath the first one.
^Hold retaining plate A against the wall so that the marks are visible through the holes of the plate (see "Installation / Retaining plate A"). Draw a line around the plate’s perimeter, then set aside the plate.
^Make a cutting line 3" (76 mm) above and 3" (76 mm) below the outline of plate "A".
^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 behind 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 cutting 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 "Attaching the Retaining plates to the wall" to complete the installation.
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