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Does a high-CFM range hood trigger makeup-air and electrical permits?
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I’m planning a kitchen remodel and want to understand the permit impact before I choose a range hood. I’m looking at a ducted-outdoors hood rather than a recirculating model, but I haven’t settled on the CFM rating or duct size yet.
The kitchen has a [gas/electric/induction] range. The house is [older and fairly drafty / tightly sealed with newer windows and weatherstripping], and there’s [no existing makeup-air system / an existing makeup-air system].
At what hood CFM level should I expect requirements beyond the normal electrical connection and duct installation? In particular, I’m trying to find out whether the building department may require:
- Dedicated makeup air, possibly interlocked with the hood
- A separate mechanical or ventilation permit
- Combustion-air or carbon-monoxide review if there are gas appliances in the house
- Limits on duct diameter, routing, or exterior termination
- Electrical inspection if the hood is replacing an existing one
I’m mainly trying to avoid choosing a hood that turns a straightforward cabinet and duct change into a larger HVAC project. What hood specifications and existing house conditions should I confirm with the building department before applying for permits?
1 reply
I wouldn’t assume there’s one universal CFM trigger. The commonly mentioned threshold may apply in one jurisdiction but not another, especially where local amendments or a different code edition are in effect.
Before choosing the hood, I’d ask the building department to review the manufacturer’s listed maximum airflow, not just the marketing name. Confirm:
- Which residential code and local amendments they use
- The CFM point at which makeup air is required
- Whether that air must be interlocked with the hood and heated
- Whether the work needs mechanical, electrical, building, or multiple permits
- Any separate requirements for gas appliances, combustion air, or CO protection
- Duct size, termination, and routing limits
Replacing an existing hood may still require an electrical inspection if the circuit, wiring, receptacle, or location changes. A like-for-like connection can be treated differently, but that’s also jurisdiction-specific. The safest budget comparison is to get the permit answer using the exact hood model and its listed airflow before ordering cabinets or ductwork.
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