How often should you clean a range hood filter?
Every month.
How to do it
Pop the metal mesh filter out and soak it in hot water with dish soap and baking soda, then rinse and dry.
Why it matters
Grease in the filter is a fire risk and stops the fan clearing smoke.
Recommended interval: every month, per Broan-NuTone.
General guidance for a typical home; the manufacturer's instructions come first.