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Text excerpt from page 24 (click to view)
Plywood backing
The majority of the weight of the installed Ventilation System will be supported by the motor assembly. Its mounting bracket must be firmly attached to the stud framing behind the drywall. If studs are not located in the required locations, a plywood backing (min. 1/ " (13mm) thick)
2
^ Find the studs to the left and right of the mounting location by tapping the wall or using a stud finder. ^ Mark the center of each of the studs with a vertical line. 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 being worked in has been turned off at the breaker panel before cutting into the wall. ^ Cut out the drywall along the marked lines and replace it with plywood of a matching thickness (min. 1/ " (13 mm)
2
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 injury and property damage.
(If plywood backing is not needed, proceed to "Attaching the hood and motor assembly to the wall.")
To install a plywood backing board
thick). Tape the joints and refinish the wall. ^ To complete the installation proceed to "Attaching the hood and motor assembly to the wall."
^ Determine and mark the location of the motor assembly as outlined in "Attaching the hood and motor assembly to the wall." ^ Mark a horizontal line 3" (76 mm) above and 9" (229 mm) below the mounting screw locations.
