Tag

#makeup air

2 articles tagged "makeup air".

Stainless steel wall-mounted range hood above a lit gas cooktop in a modern kitchen

Ventilation Sep 6, 2026

Range Hood CFM Guide: How Many CFM Do You Actually Need?

Two rules decide range hood CFM: 100 per linear foot for induction and electric, 1 per 100 BTU for gas. Sizing tables by cooktop width, plus why the number on the box is not what reaches your kitchen.

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Motorized makeup air damper and insulated duct installed in a basement mechanical room beside a water heater

Ventilation Sep 6, 2026

Range Hood Makeup Air: When Code Requires It & What It Costs

A kitchen exhaust system capable of exceeding 400 CFM triggers a makeup air requirement in IRC jurisdictions. What the code says, why backdrafting is the real hazard, and what a system costs.

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