[. . . ] discard fan or return to an authorized service facility for examination and/or repair. Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of fuel burning equipment to prevent backdrafting. Follow the heating equipment manufacturer's guideline and safety standards such as those published by the National Fire Protection Association (NFPA), the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), and the local code authorities. When cutting or drilling into wall or ceiling; do not damage electrical wiring and other utilities. [. . . ] Consult a qualified electrician if the grounding instructions are not completely understood, or if doubt exists as to whether the range hood is properly grounded. If the power supply cord is too short, have a qualified electrician install an outlet near the range hood. Before making cutouts, make sure there is proper clearance within the ceiling or wall for exhaust vent. For vented installations, determine which venting method to use: roof or wall. Determine and clearly mark a vertical centerline on the wall and cabinet in the area the vent opening will be made. Excessive Weight Hazard Use two or more people to move and install range hood. Using 2 or more people, lift the range hood and set it upside down onto covered surface. To wire through top: Mark a line distance "A" from the left of the centerline on the underside of the cabinet. 1 cm) from wall, not cabinet frame 1 cm) from the back wall on the centerline of the underside of cabinet. *From wall, not cabinet frame To make a circular vent opening on the underside of the cabinet top: 1. Use a compass or a circle template to draw a circle with a diameter that is ¼" (0. *From wall, not cabinet frame Make 2 lines by measuring ³/" (9. 8 cm) down from underside of cabinet and mark on the centerline on the back wall. Use saber or keyhole saw to cut a rectangular opening in the wall for the vent. *From wall, not cabinet frame Install vent through the vent opening in upper cabinet or wall. 1 cm) from the back wall on the centerline of the underside of cabinet. If using rectangular vent, attach rectangular damper/vent connectors to the range hood using sheet metal screws. If using round vent, attach vent transition piece (purchased separately) to range hood top using sheet metal screws. NOTE: If the wall cap is directly behind the vent connector, the dampers in the connector and wall cap must not interfere with each other. For vented installations: Depending on your installation, remove either top or rear rectangular vent knockout. 5 cm) on either side of the hood center to accommodate off-center ductwork. 4 cm) space between screw heads and cabinet to slide range hood into place. [. . . ] This warranty is void if the factory applied serial number has been altered or removed from your major appliance. The cost of repair or replacement under these excluded circumstances shall be borne by the customer. If outside the 50 United States and Canada, contact your authorized Whirlpool dealer to determine if another warranty applies. If you need service, first see the "Troubleshooting" section of the Use & Care Guide. [. . . ]