United States
Hong KongVentilation: hoods, filters and the condensation problem
Ventilation must remove grease, steam, smoke, heat, odor and condensation so they do not accumulate on surfaces or drip into food. Filters are cleanable and cleaned on a schedule, and condensation dripping onto food is a contamination finding.
One question, and the reason it is a food safety topic rather than a comfort one is worth thirty seconds of your attention.
What ventilation is preventing
Grease vapor lands on ceilings, light fittings, walls and shelving, where it collects dust and eventually drips. Steam condenses on cold surfaces and runs. Smoke deposits particulate.
None of that is a pathogen on its own. All of it becomes contamination when it reaches food, which is why the Code frames ventilation as preventing accumulation rather than as air quality.
What is required
- Sufficient ventilation to keep rooms free of excessive heat, steam, condensation, vapors, obnoxious odors, smoke and fumes.
- Hood systems and filters designed to prevent grease and condensation collecting on walls and ceilings.
- Filters that are readily removable for cleaning and replacement, where not designed to be cleaned in place.
- Intake and exhaust air ducts maintained so they do not become a source of contamination.
Filters
Removable, cleanable, and actually cleaned. A grease-loaded filter stops filtering and starts dripping, which converts a control into a hazard.
Frequency depends on the cooking. A fryer line needs filters cleaned far more often than a sandwich station, and a schedule that treats them the same is a schedule written for the paperwork.
Water dripping from a ceiling, a pipe or a refrigeration unit onto a prep table is contamination. Putting a bucket under it is not a corrective action, and an answer option offering one is testing that.
The fire angle
Grease accumulation in a hood system is also the leading cause of commercial kitchen fires, and fire is one of the imminent health hazards requiring closure and notification.
So hood cleaning sits in two places at once: a food safety requirement and a fire prevention one. Most jurisdictions require professional hood cleaning at a documented interval on the fire side.
What an inspector looks at
Filters in place and reasonably clean. No visible grease on ceilings or light fittings above food. No condensation anywhere it could drip. Air moving in the right direction, so a toilet room does not exhaust into a kitchen.
The last one is structural and outside a manager's control, which is why it is worth noticing during a fit-out rather than during an inspection.
Common questions
Why is ventilation a food safety issue?
Grease vapor, steam and smoke accumulate on ceilings, fittings and shelving, then drip or fall into food. The Code frames ventilation as preventing that accumulation rather than as air quality.
How often should hood filters be cleaned?
Often enough to prevent grease accumulation, which depends on the cooking. A fryer line needs far more frequent cleaning than a sandwich station, and a uniform schedule usually means neither is right.
What if condensation drips onto a prep table?
It is a contamination finding. Placing a bucket under it is not a corrective action - the source has to be fixed and the surface cleaned and sanitized.
Is hood cleaning a fire requirement too?
Yes. Grease accumulation in hood systems is a leading cause of commercial kitchen fires, and most jurisdictions require professional cleaning at a documented interval under fire regulations.
What do inspectors check on ventilation?
Filters present and clean, no visible grease on ceilings or light fittings above food, no condensation where it could drip, and air moving so that toilet rooms do not exhaust into food areas.