Turn off the power to your kitchen at the electrical box.
Remove the vent grille from the kitchen vent, using the screwdriver to loosen the screws. Gently lower the vent grille from the vent.
Pull the wire nuts off of the wires connecting the old fan to the electricity. Use the screwdriver to remove the fan from the brackets holding it to the wall. Lower the old fan from the vent.
Place the new vent fan into the vent. Slip the fan between the vent’s brackets and tighten the screws with the screwdriver to hold it in place.
Twist the fan's wires to their corresponding color. Twist the black wires to the black, the white to the white and the green to the green or copper wires. Place a wire nut over each wire connection.
Place the vent grille over the fan and screw it into the range hood.