Installing a range hood fan requires mounting the unit to wall studs, connecting rigid metal ductwork to an exterior vent, and wiring the electrical circuit per manufacturer specs.
Position the hood at the right height—30 inches above a gas range, 24 inches minimum for electric—and you’re ready to mark the wall, cut the vent opening, mount the hood to studs, and connect the wiring. The job takes a few hours with basic carpentry tools and a willingness to follow local electrical codes.
Measure and Mark the Wall Position
Start by unpacking the hood and removing the filter, exhaust fan, and electrical cover so you can access the mounting points and duct outlet. Draw a vertical centerline on the wall that aligns with the center of your cooking surface, then draw a horizontal line at the mounting height you’ve chosen. For gas ranges, that’s 30 inches above the cooktop; for electric, 24 inches is the minimum but 30 inches is standard for safety and performance. Mark the vent hole location based on where the hood’s duct outlet will sit.
Before cutting anything, check for studs and wiring behind the drywall with a stud finder. This is also a good moment to confirm the hood size matches your setup—if you’re working with a wider cooktop, our roundup of the best 36-inch hood fans can help you choose the right unit for the space. Mark the four corners of the vent template and drill locator holes through to the exterior so you know where to cut from outside.
Cut the Vent Opening and Run the Ductwork
Cut a small test hole first to verify nothing is in the way, then cut the exterior opening using an oscillating tool or hole saw. Remove siding and insulation as needed so the duct fits cleanly. Install the wall cap on the exterior with self-tapping screws and seal the edges with silicone caulk to make it watertight. On the interior side, install the damper into the back of the hood so the flap faces outward—this lets air exhaust freely when the fan runs and blocks backdrafts when it’s off.
Connect rigid metal ductwork (6-inch diameter for most residential wall-mount hoods) from the hood outlet to the wall cap using aluminum foil tape on every joint. Keep the total duct run under 30 feet with as few bends as possible. Plastic or flexible ducts reduce airflow and violate best practices, so stick with smooth galvanized or stainless steel pipe.
| Installation Requirement | Standard Spec |
|---|---|
| Clearance above gas range | 30 inches minimum |
| Clearance above electric range | 24 inches minimum (30 recommended) |
| Duct diameter | 6 inches for most wall-mount units |
| Duct material | Rigid metal (galvanized or stainless steel) |
| Maximum duct run | 30 feet with minimal bends |
| Damper flap direction | Faces outward (toward exterior) |
| Wire colors | Black (hot) to black, white to white, copper/green to ground |
Mount the Hood and Wire the Electrical
Screw the mounting brackets into wall studs, checking that they align with your vertical centerline. Lift the hood—get a helper, it’s awkward alone—and hang it on the brackets. Use a level to make sure the hood is parallel to the cooktop, then drive screws through the unit into the studs. Some hoods use keyhole slots; if yours does, partially install the screws first and slide the hood into place.
Before connecting power, turn off the breaker. Run the electrical line from your junction box through the knockout hole on the hood, strip the wires, and connect black to black, white to white, and the ground wire to the ground screw using wire nuts. Tuck all connections neatly inside the junction box and replace the cover. Reinsert the fan motor into its housing, install the filters, and seal every duct joint with foil tape one last time. Snap the trim piece over any exposed ductwork for a finished look, then restore power and test the fan.
FAQs
Can I install a range hood fan without existing ductwork?
Yes—ductless (recirculating) models filter the air and release it back into the kitchen, so no exterior vent opening is needed. Most ducted hoods can be converted to ductless with a charcoal filter kit, but the performance won’t match a properly vented setup.
What happens if I hit a stud when cutting the vent hole?
You’ll need to cut the opening larger and reframe around the stud, or relocate the vent if the stud is in the center. That’s why drilling locator holes and checking for studs before cutting is essential—it saves a major headache later.
Do I need a professional electrician for the wiring?
If you’re comfortable with basic wiring and local codes allow DIY work, the color-to-color connections are straightforward. But any new circuit run or work inside the breaker panel should be handled by a licensed electrician.
References & Sources
- Home Depot. “How to Install a Range Hood.” Step-by-step guide covering marking, cutting, mounting, and wiring.
- Lowe’s. “How to Install a Vented Range Hood.” Clearance specs, ductwork guidance, and mounting instructions.
- Vent-A-Hood. “Installation Support.” Manufacturer-specific wiring and mounting documentation.