Ventilation cleaning is a compliance job wearing a cleaning job's clothes. Regulation 6 of the Workplace (Health, Safety and Welfare) Regulations 1992 requires mechanical ventilation systems to be maintained in an efficient state, in efficient working order and in good repair, and the record of the last clean is what a fire risk assessor, an insurer or an environmental health officer asks to see. The photographs matter as much as the work.
What the standard is
The building engineering body BESA publishes TR19, the specification the trade and British insurers treat as the benchmark for cleaning ventilation systems. It comes in two parts: TR19 Air, for internal cleanliness and hygiene management of ventilation systems, and TR19 Grease, for fire risk management of grease accumulation in kitchen extraction systems. A contractor quoting ventilation hygiene should be able to say which one applies to your system.
What a proper clean produces
Access panels fitted where they are missing, because a system nobody can open is a system nobody has cleaned. Pre and post cleaning photographs at named positions. A measured verification of cleanliness rather than a visual opinion. A report naming the sections cleaned, those that could not be reached and why, and the date of the next recommended clean. If the paperwork does not name positions, it is not evidence of anything.
How often, and what decides it
Frequency follows use and risk, not the calendar. A kitchen extraction system serving heavy frying needs attention several times a year. A general office supply and extract system is usually annual or longer. What decides it is measured deposit rather than habit, which is why a survey before the first clean is money well spent and why a contractor offering a fixed frequency without seeing the system is selling a subscription.
Extract fans and the small stuff
Local extract in washrooms, tea points and small kitchens is easy to forget because nobody specifies it. A fan clogged with dust moves less air, runs hotter and is a common cause of complaints about smells that are blamed on cleaning. Put local extract grilles and fan casings on the periodic schedule of the main cleaning contract, and keep the ductwork itself with the ventilation hygiene contractor.
Questions people ask about duct cleaning near me
What is TR19?
The BESA specification for cleaning ventilation systems, widely referenced by British insurers. TR19 Air covers general ventilation hygiene and TR19 Grease covers kitchen extract fire risk.
How often should commercial air ducts be cleaned?
It depends on measured deposit and use. Heavy kitchen extract can need several visits a year; a general office system is often annual or less frequent.
What evidence should I get after a duct clean?
Pre and post photographs at named positions, a measured verification of cleanliness, a list of any sections not reached and why, and the recommended next date.
Does my insurer require duct cleaning?
Many commercial policies reference the grease standard for kitchen extract. Check the policy wording, because the evidence you must keep is usually specified there.