Article overview
When a hood loses suction, start with airflow: filters, obvious duct restrictions, then blower and control diagnosis — not laundry exhaust myths.
A hood that used to clear the kitchen and now leaves a haze is an airflow problem until proven otherwise. Grease-loaded filters are the first, owner-accessible restriction. A crushed or disconnected duct is a different restriction. A worn blower is a third. Those are not interchangeable with dryer lint stories.
Clean filters with the power off. If suction returns, you found the maintenance issue. If it does not, stop disassembling the hood. Motors and electrical controls are diagnosis work.
Note whether all speeds are weak or only high speed, and whether the noise changed. A quiet weak fan and a loud weak fan are different clues.
Independent ventilation repair in Los Angeles County and Orange County starts with those clues, then a written estimate before any blower or control work.
