Trace the hood outlet onto the cabinet, cut it out, and cut another hole for the duct.  If the cabinet is already hung, measure for the holes as carefully as you can before cutting them out.

Wiring.  Run non-metallic cable behind the wall and bring it out through a small hole in a place where the electrical junction box of the hood will cover it.  Strip away 6 to 8 inches of the sheathing from the end of the cable and attach a cable clamp at that point, just outside the wall.

Venting.  Run a 7-inch duct pipe into the cabinet from the attic or an exterior wall behind the cabinet.  The pipe should vent all the way to the outside, terminating in a roof cap or wall cap.  Secure each joint with sheet metal screws and tape it with approved duct tape.  Connect a transition fitting to the round duct for the rectangular opening in the hood, as well as any elbows need for changing the direction of the duct in the cabinet.  If an elbow won't fit, make a cardboard
Most range hoods are 6 inches high, although some are high as 30 inches.  They are 18 to 24 inches deep, sloping upward to the standard cabinet depth of 12 inches.  They come in widths to match ranges and cooktops, 30, 36, or 48 inches.  For energy conservation, many include a damper that prevents room heat from escaping when the unit is off.

Installing under a cabinet.  If you are mounting a ducted range hood under a cabinet, cut holes in the cabinet for the hood outlet and duct before installing the cabinet.  Mark holes for cutting by setting the cabinet upside down on the
floor and laying the hood upside down on top of it. 
template showing cutouts and have a sheet metal shop make a metal box.

Attaching the hood.  Lift or prop the hood into place and mark where the screw holes line up against the bottom of the cabinet.  Take the hood down and, on these marks, drill pilot holes for the screws.  Lift the hood back up, feed the wires into the junction box, and screw it into the junction box, and screw it to the bottom of the cabinet.

Using wire nuts, connect the wires inside the junction box.  Screw the ground wire to the grounding screw in the hood.  The connect the hood collar to the duct transition piece with sheet metal screws and wrap the joint with duct tape.

Installing A Range Hood

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