A kitchen ventilation appliance that captures cooking contaminants and either exhausts them outdoors or filters and returns the air.
Also known as: kitchen exhaust hoodcooker hoodventilation hood
A range hood is a kitchen ventilation appliance positioned over or near cooking equipment to capture cooking contaminants and either exhaust them outdoors or filter and return the air to the room. In a compact home, it can reduce airborne particles, heat, grease, and odors near cabinets and finishes, but it does not make cooking emissions disappear. A recirculating range hood filters and returns air. A ducted range hood sends captured air through a duct to the outdoors. Those configurations handle pollutants differently, and a hood is not automatically an outdoor vent.
What a range hood does in a small kitchen
The term covers the hood assembly, fan, filters, controls, and duct or recirculation configuration. A conventional canopy hood places an intake shape and fan above the cooking surface. Under-cabinet, wall chimney, island, insert, remote-fan, and downdraft systems use different physical arrangements, but they belong to the same ventilation category when they capture cooking emissions. What matters is where the hood captures air and what happens to that air afterward.
Cooking emissions build up quickly in a small room. A hood can help protect nearby cabinets and finishes and make a studio kitchen more comfortable, especially when the living area shares the same air. Its space cost is more than the visible canopy. Plan for the hood width and depth, mounting height, duct route, filters, sound, and any makeup-air requirement. A large or deep hood may intrude on a compact work zone, while a poorly positioned hood may capture less effectively even when its fan is powerful.
Size airflow around the cooking setup
Do not choose CFM from room size alone. The Home Ventilating Institute recommends 100 CFM per linear foot for a wall-mounted range and gives 40 CFM per linear foot as a minimum in its guidance. Its examples are 250 CFM recommended and 100 CFM minimum for a 30-inch hood, 300 and 120 for 36 inches, and 400 and 160 for 48 inches. For an island location, HVI recommends multiplying the rate by 1.5. These are HVI guidance values, not one universal legal requirement or a promise that every installation will deliver the advertised airflow.
Start by matching the hood width to the cooking range and use the appliance manufacturer's recommended mounting height. Then compare airflow, sound, power, width, depth, filter type, filter cleanability, duct size and route, backdraft damper, and makeup-air requirements. Duct length, bends, termination, filters, and static pressure affect delivered airflow, so a maximum CFM printed on a product page is not enough for a compact-kitchen decision. HVI-certified ratings can make airflow and sound comparisons more meaningful because the voluntary program uses designated-lab testing. For qualifying ENERGY STAR range hoods up to 75 watts, the ventilating-fan criteria include a 2.0-sone maximum under the program's test conditions. That criterion does not describe every hood or every operating condition.
Ducted versus recirculating range hoods
A ducted hood exhausts captured air through a duct to the outdoors. A recirculating hood passes air through filters and returns it to the kitchen. Both may have a familiar canopy shape, but they do not provide the same result. HVI says nonducted recirculation hoods provide no actual ventilation, and the EPA recommends outdoor venting if possible. If outdoor exhaust is feasible, recirculation can leave moisture, heat, and combustion products indoors. If a duct route is not feasible, recirculation may be the available configuration, but describe it as filtration and return air rather than outdoor ventilation.
The installation choice has a small-space tradeoff. A ducted system needs a practical route, a suitable termination, and a plan for the air leaving the room. A high-airflow system can require makeup air and can create combustion-appliance backdrafting in some homes. A recirculating system avoids the duct route but gives up outdoor exhaust. Check the actual appliance, building conditions, and local code or mechanical requirements instead of treating one configuration as universally correct.
Run and compare a hood carefully
The EPA recommends using a hood while cooking, venting outdoors if possible, leaving it on for 10 to 20 minutes after cooking, and using back burners when possible. If combustion appliances or makeup air are involved, consult a qualified professional before selecting or installing a high-airflow hood.
For a compact kitchen, measure the range width, hood depth, mounting location, duct path, and clearance to cabinets before shopping. Compare certified sound and airflow information under comparable conditions, and check the exact filter and installation guidance. Choose based on the capture position, airflow, sound, exhaust or recirculation setup, and installation requirements. The highest advertised CFM is not enough.
Frequently asked questions
How many CFM do I need for a range hood?
HVI gives location- and width-based guidance, including 250 CFM recommended and 100 CFM minimum for a 30-inch wall-mounted example. Treat that as a starting point, not a universal requirement. Use the cooking equipment manufacturer's guidance, check the hood's width and ducting, and confirm applicable local requirements for the exact project.
Is a recirculating range hood the same as outdoor ventilation?
No. A recirculating hood filters and returns air to the kitchen. HVI says nonducted recirculation hoods provide no actual ventilation, and the EPA recommends outdoor venting if possible. It therefore does not substitute for a feasible ducted exhaust route when outdoor ventilation is the goal.
Is a higher-CFM range hood always better?
No. Ducting, static pressure, sound, makeup air, and possible combustion-appliance backdrafting matter along with airflow. A larger fan can also be a poor fit for the room or installation. Compare certified performance and the installation conditions instead of choosing by maximum advertised CFM alone.