What You Need to Know Before You Start

Installing a range hood yourself is possible if you have basic carpentry and electrical skills, but the job involves cutting into your wall or cabinet, running ductwork, and making an electrical connection—all of which can go wrong and create safety or building code problems. Most installations take four to eight hours if you are comfortable with a drill, saw, and stud finder. If you are not, or if your kitchen has plumbing or gas lines near where the hood will go, hire a licensed electrician and possibly a carpenter.

Before you buy or start, measure the width of your cooktop, check whether your kitchen has a clear path to the outside (or a place to vent into the attic), and find out what your local building code requires—some jurisdictions mandate a licensed installer for any hood that vents to the outside.

Key Takeaways

  • Range hoods must be 24 to 30 inches above the cooktop surface and centered over the burners, with the width matching or exceeding the cooktop width.
  • You need to run ductwork from the hood to the outside wall or roof, or use a recirculating filter if outside venting is not possible.
  • The electrical connection requires a dedicated 120-volt circuit; if you do not have one, you must hire a licensed electrician to add it.
  • Cutting into walls or cabinets risks hitting studs, wiring, or plumbing—use a stud finder and check your kitchen layout before you cut.
  • Many jurisdictions require a building permit and inspection for range hood installation, so check your local code before starting.

Measure and Plan the Location

The hood must sit 24 to 30 inches above the cooktop surface—measure from the top of your burners or cooking surface, not the countertop. Most hoods are 30, 36, or 42 inches wide; choose one that matches or exceeds your cooktop width. Center the hood over the burners so that steam and smoke rise straight into the intake.

Next, trace the outline of the hood on the wall or cabinet above your stove using a pencil. Mark the center point of where the ductwork will exit—this is usually the back or top of the hood, depending on the model. Use a stud finder to locate wall studs, electrical outlets, and any pipes or wiring behind the wall. If you hit a stud or find plumbing, you may need to move the hood slightly or call a professional to reroute utilities.

Check your local building department's website or call to find out whether you need a permit. Many jurisdictions do, and skipping this step can cause problems when you sell the house or file an insurance claim.

Choose a Venting Path: Outside or Recirculating

Outside venting (ducted) removes steam and odors completely and is more effective than recirculating. You will need to run ductwork from the hood to an exterior wall or through the roof. If your hood vents out the back, you need a clear path through the wall behind the stove. If it vents up, you need access to the attic or roof above. Ductwork should be as straight as possible—every bend reduces airflow—and should not be smaller than the hood's outlet diameter (usually 6 or 8 inches).

Recirculating hoods pull air through a charcoal filter and push it back into the kitchen. They do not require outside venting and are easier to install, but they do not remove moisture and must have the filter replaced every three to six months. Use this option only if outside venting is impossible.

If you choose outside venting and the path is complex—through walls, attic, or roof—hire a contractor who has done this work before. A poorly sealed duct can leak conditioned air and waste energy.

Install the Mounting Bracket and Hood Body

Most range hoods come with a mounting bracket that attaches to the wall or cabinet. Hold the bracket at the correct height and use a level to make sure it is straight. Mark the screw holes with a pencil, then drill pilot holes (slightly smaller than the screws) to prevent the wood from splitting. Screw the bracket firmly into place—it must support the weight of the hood and vibration from the fan.

Slide or bolt the hood body onto the bracket according to the manufacturer's instructions. Some hoods slide onto a rail; others bolt directly. Make sure the hood is level and centered over the cooktop before you tighten all fasteners. If the hood is crooked, the ductwork connection will be misaligned and the fan will vibrate.

Once the hood is mounted, connect the ductwork. If venting outside, attach flexible or rigid duct to the hood outlet and run it to the exterior wall or roof opening. Seal all joints with duct tape or mastic sealant to prevent air leaks. If venting through the wall, you will need to cut a hole in the exterior wall—this is where a contractor is worth the cost, because a poorly cut hole can let in water and pests.

Run the Electrical Connection

Range hoods require a dedicated 120-volt circuit with a 15-amp breaker. If you do not have an outlet near the hood, or if the nearest outlet is shared with other appliances, you must hire a licensed electrician to run a new circuit from your electrical panel. This is not a DIY job—mistakes can cause fire or electrocution.

If an outlet already exists within reach of the hood (usually behind or above it), you can plug the hood in directly. Make sure the outlet is grounded (three-prong) and that nothing else is plugged into it. Some hoods have a hardwired connection instead of a plug; if yours does, the electrician will connect it to the new circuit during installation.

After the electrical connection is complete, test the hood by turning it on and checking that the fan runs smoothly and the damper (a flap that prevents backflow) opens when the fan is on.

Seal and Insulate the Ductwork

Any gap in the ductwork allows conditioned air to escape and outdoor air to enter, wasting energy and letting in pests. Seal all joints with duct mastic (a putty-like sealant) or metal-backed duct tape. Do not use regular cloth duct tape—it degrades over time and fails.

If the ductwork passes through an unconditioned space like an attic, wrap it with fiberglass insulation to prevent condensation from forming inside the duct. Condensation can drip back into the hood or promote mold growth.

At the exterior wall or roof, install a damper hood or wall cap that prevents outside air from flowing backward when the fan is off. This is usually included with the hood or sold separately.

Test and Adjust Airflow

Turn on the hood and hold a piece of tissue or a lit match near the cooktop to see whether air is being pulled upward into the hood. If the tissue does not move or the flame leans away from the hood, the ductwork may be blocked, kinked, or too long. Check for kinks in flexible duct and make sure the damper is opening fully.

If the hood is noisy, the ductwork may be undersized or the fan may be vibrating against the mounting bracket. Tighten all fasteners and check that the duct diameter matches the hood outlet size. Some noise is normal, but a loud rattle usually means something is loose.

Run the hood for a few minutes while cooking to make sure it removes steam and odors. If it does not, the ductwork may be too long or have too many bends—this is a common problem when venting through a long run of attic space.

Frequently Asked Questions

Can I install a range hood myself if I have never done this before?

You can handle the mounting and ductwork if you are comfortable with a drill, saw, and level. The electrical connection must be done by a licensed electrician if you are adding a new circuit. If you are unsure about cutting into walls or running duct through the attic, hire a contractor—mistakes are expensive to fix.

What if I cannot vent the hood outside?

Use a recirculating hood with a charcoal filter instead. It is easier to install and does not require ductwork, but you will need to replace the filter every few months and it does not remove moisture from the kitchen.

How do I know if my ductwork is the right size?

The duct diameter should match the hood outlet size, which is usually printed on the hood or in the manual. Most residential hoods use 6-inch or 8-inch duct. Undersized duct reduces airflow and makes the fan work harder.

Do I need a permit to install a range hood?

Many jurisdictions require a permit, especially if the hood vents to the outside. Check your local building department's website or call before you start. A permit usually costs $50 to $200 and requires an inspection after installation.

What should I do if the hood is vibrating or making noise?

Tighten all mounting bolts and check that the ductwork is not kinked or rubbing against the hood. Make sure the duct diameter matches the outlet size. Some vibration is normal, but a loud rattle usually means a fastener is loose or the duct is undersized.