How to Install a Range Hood Vent

Installing a range hood vent requires mounting the hood to wall studs or cabinet, connecting the ductwork to vent outside, and wiring the electrical connection. Most installations take 2-4 hours depending on whether ductwork already exists.

1. Size and Code Check First. Measure your cooktop to determine the right hood size - it should be at least as wide as your cooking surface. Check local building codes for height requirements, typically 24-30 inches above electric cooktops and 30-36 inches above gas ranges. Determine if you need ducted (vented outside) or ductless (recirculating) installation based on your kitchen layout and local codes.
2. Kill the Power. Switch off electricity at the circuit breaker for the area where you'll be working. Remove any existing range hood by disconnecting the electrical connection, removing mounting screws, and carefully lifting it down. Clean the wall area and check that the mounting surface is level and can support the hood's weight.
3. Anchor to the Studs. Hold the mounting bracket against the wall at the correct height and mark the screw holes. Use a stud finder to locate wall studs and mark their positions. Drill pilot holes and secure the bracket with wood screws into at least two studs. If studs aren't available in the right spots, use heavy-duty toggle bolts rated for the hood's weight plus 50 pounds.
4. Route the Vent Path. Mark the vent hole location on the wall or cabinet above where the hood will mount. The hole should align with the hood's exhaust port. Use a reciprocating saw or hole saw to cut through drywall, then drill a pilot hole from inside to mark the exterior location. Cut the exterior hole with appropriate tools for your siding material - wood, vinyl, or brick.
5. Seal Every Seam. Run rigid metal ductwork from the hood location to the exterior wall, keeping the path as straight as possible with minimal turns. Secure joints with metal tape and duct screws. Install a wall cap or roof cap on the exterior end, ensuring proper weatherproofing with caulk around the opening. Connect the interior end to a transition piece that will attach to your hood.
6. Wire to Code. Run electrical cable from your electrical panel to the hood location if no circuit exists. Most range hoods require a dedicated 15 or 20-amp circuit. Install a junction box in the wall or cabinet where the hood will mount. Connect the hood's wiring to the house circuit following the manufacturer's diagram - typically black to black, white to white, and green or bare copper to ground.
7. Level and Lock Down. With help from another person, lift the hood into position and hook it onto the mounting bracket. Align the hood so it's level and properly positioned over the cooktop. Secure it with the provided screws through the mounting holes into the bracket. Double-check that it's firmly attached and doesn't wobble.
8. Verify All Systems Go. Attach the hood's exhaust port to your ductwork transition piece using metal tape and screws. Make sure the connection is tight and sealed. Restore power at the circuit breaker and test all fan speeds and lights. Check that air flows properly to the exterior by holding a tissue near the outside vent while the fan runs.