Kitchen ventilation · Boca Raton, FL
Does a Range Hood Need to Vent Outside in Boca Raton?
Does a range hood need to vent outside in Boca Raton? By default, yes: Florida's residential code sends a hood's air outdoors through its own duct. A listed ductless hood is the one exception. The second question arrives with a bigger hood: above 400 CFM the code asks for makeup air, and a house can stretch that line to 800 only when no gas appliance inside it vents by natural draft.
- Makeup air above
- 400 CFM
- · Unless the house exception applies
- House exception up to
- 800 CFM
- · No natural draft appliance inside
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What the Florida Code Says First
Most search results answer no. Florida's residential code starts from yes: it says that range hoods shall discharge to the outdoors through a duct that is airtight, has a backdraft damper and serves nothing else, and that the duct may not end anywhere inside the building.
The exception is narrower than the ads for ductless hoods suggest. A recirculating hood is allowed when it is listed and labeled, installed to the maker's instructions, and the kitchen gets its ventilation from somewhere else. It pulls air through a grease filter and a charcoal filter and hands it back to the room. The grease stays behind. The heat and the steam from the pot come back out.
So the honest answer depends on what sits under the hood. Over an induction cooktop in a kitchen with a window, a listed ductless hood is a legal choice. Over a gas range, read the third section before you pick one.
The Rating on the Hood Is the Number That Counts
The second line in the code is the one a luxury kitchen tends to reach. It is written about what a hood is capable of exhausting, not what you plan to run it at. A hood rated at 900 CFM that lives on its lowest setting is still a 900 CFM hood.
Above 400, Section M1503.4 of the residential code requires makeup air at roughly the rate the hood exhausts, through a damper that opens when the fan runs. Then comes an exception for houses: in a single-family dwelling, none is required up to 800 if there are no gravity vent appliances within the conditioned living space.
That phrase means a gas appliance that sends its exhaust up a flue by natural draft. A water heater like that in the garage sits outside that space. One in a closet off the hall sits inside it. Above 800, every house needs the makeup air, and the code wants it delivered to the kitchen or to a room open to it.
A Gas Range Changes the Advice
On a gas range the federal advice goes past the code. The EPA lists gas stoves among the main indoor sources of nitrogen dioxide, and its step for a kitchen is plain: install and use an exhaust fan vented to outdoors over gas stoves. A recirculating hood is built to catch grease, not combustion gases.
That is why the choice between ducted and ductless is really made when the range is chosen. An induction cooktop leaves the hood with steam, heat and odors, and a listed ductless hood can be a fair answer where a duct cannot go. A gas range, and above all a large one, points to a duct to the outside.
The part people skip is the second verb in that EPA sentence. A hood too loud to run gets left off, and a hood left off protects nobody. Listen to it at the speed you would really cook on.
