How Often Should a Commercial Hood Be Cleaned?

Frequency follows grease production

Two kitchens of the same size can need service at completely different intervals. What matters is how much airborne grease reaches the hood: a charbroil and fry line generates a heavy load, a bakery or steam-heavy kitchen far less. Hours of operation multiply whatever your equipment produces.

Typical planning ranges

• Solid fuel cooking — wood, charcoal and similar produce the heaviest, fastest accumulation and are commonly scheduled on the shortest interval of any kitchen type.
• High-volume operations — 24-hour kitchens, busy fry and grill lines, and large-scale production typically need service several times per year.
• Moderate-volume restaurants — most full-service kitchens land somewhere between quarterly and semi-annual once the first cleaning shows the actual load.
• Low-volume and seasonal kitchens — church kitchens, day camps, seasonal venues and lightly used break-room lines usually run the longest intervals, but they still need a schedule.

Treat these as planning ranges, not rules. Your local authority having jurisdiction, insurance carrier and landlord can each impose their own requirement, and theirs governs.

Signs your system is overdue

• Visible grease on the hood interior, filter frames or the underside of the canopy
• Grease dripping onto the cooking surface or pooling at the filter track
• Smoke lingering on the line instead of clearing during service
• The kitchen running hotter than it used to at the same production level
• Grease staining on the roof around the fan curb
• Fan noise, vibration or a noticeable drop in draw
• An inspector or insurer asking for documentation you cannot produce

Why intervals should be set from evidence

The first professional cleaning is also a measurement. How much material comes out of the duct and fan tells you whether your interval is right, too long or unnecessarily short. A provider who cannot describe what they removed cannot help you set a schedule.

Between scheduled cleanings

Filter cleaning is the in-house task that most affects how fast the rest of the system loads. Establish a routine — see hood cleaning maintenance and hood filter cleaning. It will not replace a full cleaning, but it slows accumulation between visits.

Common questions