Range Hood — Kitchen Ventilation and Smoke Capture

A range hood is the ventilation appliance installed above a cooktop or range to capture smoke, grease, heat, and cooking moisture.

What It Is

The hood houses the filters, fan, lights, and duct connection that remove cooking byproducts from the kitchen. On ducted systems, air is exhausted outdoors; on recirculating systems, filtered air is returned to the room.

Types

Common types include under-cabinet hoods, wall-mount chimney hoods, insert liners, microwave-hood combinations, island hoods, and recirculating hoods. Capture area, blower power, and noise vary by design.

Where It Is Used

Range hoods are used above residential cooktops and ranges, especially in kitchens with gas appliances, high-output burners, or limited natural ventilation. Good hood sizing and duct layout affect real-world performance more than appearance alone.

How to Identify One

Look for the canopy or cabinet-mounted vent unit directly above the cooking surface. Grease buildup, poor smoke capture, noisy operation, nonworking lights, or visible dripping grease from the filters are signs the hood needs service.

Replacement

Replacement may be driven by poor ventilation, excessive noise, remodeling, or a failed blower/control assembly. Matching width, mounting height, duct size, and vent path is critical so the new hood performs better instead of just looking newer.

Range Hood — FAQ

Does a range hood have to vent outside?

Ducted hoods perform better because they remove heat, moisture, grease, and combustion byproducts from the home. Recirculating hoods help somewhat with grease and odor but do not exhaust moisture or gases outdoors. If exterior venting is feasible, it is usually the better option.

How often should range hood filters be cleaned?

Metal grease filters in a typical home kitchen often need cleaning every one to three months, depending on cooking habits. Frequent frying or heavy gas cooking means more frequent cleaning. Charcoal filters in recirculating units are replaced, not washed, on the manufacturer’s schedule.

Why does smoke escape even when the hood is on?

The hood may be too small, mounted too high, clogged with grease, or connected to a restrictive duct run. Cross-drafts from open windows and HVAC supply registers can also pull smoke away from the capture area. The blower itself is only one piece of the system.

Can I replace a microwave with a real range hood?

Often yes, but cabinet work, electrical changes, and a new duct path may be needed. The result is usually much better ventilation and easier maintenance. Measure the space and check whether the current setup actually vents outdoors before planning the change.