Ventilation and fans

Size bathroom fans, range hoods and ceiling fans from HVI, ENERGY STAR and code figures, with the makeup air question explained.

Guides and calculators

Bathroom Exhaust Fan and Range Hood Calculator: CFM by Room

Work out bathroom fan and range hood airflow in cfm from HVI's guidelines, see the 2021 IRC table figure beside it, and find out when makeup air comes in.

6 min read Ventilation and fans

Ceiling Fan Size Calculator: Blade Size and Mounting Height

Find the ceiling fan blade size for your room from ENERGY STAR's chart, then check mounting height, wall clearance and downrod length before you buy one.

5 min read