TR19 Air ventilation duct cleaning

What ventilation duct cleaning involves

Kitchen extracts carry grease, but every other ventilation system carries something too. Supply ducts collect dust and debris that get past the filters, and extract ducts from toilets, offices and other rooms gather dust and fluff over time. BESA’s TR19® Air covers the hygiene of these general supply and extract systems in offices, schools, hospitals, care homes and other buildings. It takes a risk-based, inspection-led approach: the system is inspected, its condition is measured and recorded, and it is cleaned when it needs to be. The Vent Hygiene Register expanded to cover TR19 Air from March 2026 (BESA: ventilation hygiene standards). We inspect the ductwork through access panels and grilles, photograph its condition, then clean it and the grilles and diffusers it serves. Our article on TR19® Air explains the specification.

We cover London and the South East, and have done since 2009. We’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, we hold CHAS, SafeContractor and ISO 9001, and we’re fully insured.

Problems we put right

• Dust and debris building up inside supply ducts
• Dirty grilles and diffusers around the building
• Stale or musty air in occupied rooms
• No record of when the ducts were last cleaned
• A system not inspected since it was installed

What we work on

• Supply ductwork
• General extract ductwork
• Grilles and diffusers
• Toilet extract systems
• Offices and schools
• Hospitals and care homes

Why it’s worth doing now

Ventilation ducts are out of sight, so they’re easy to forget for years. Dust and debris inside supply ducts can be blown into occupied rooms, and dirty grilles are often the first thing staff and visitors notice. Building owners have health and safety duties for the people inside, and TR19® Air gives a recognised way to show the ventilation is inspected and kept clean. An inspection now tells you what condition the system is in before anyone complains, and lets you plan any cleaning around the building’s quieter times.

What affects the quote

We don’t publish set prices, because no two systems are the same. Send us a few details and photos, or book a survey, and we’ll give you a fixed price before any work starts. The main things that change it are:

• The size of the system: number of canopies, length of ductwork, risers and fans
• How much grease or dirt has built up since the last clean
• Access: roof-level fans, ceiling voids, risers and how many access panels there are
• When the work can happen: overnight, weekends or school holidays
• Whether extras are needed, such as new access panels, filter exchange or damper testing
• How many sites you want covered on one schedule

Read our guide to what affects the cost.

What a good quote includes

• A survey or clear photos before the price is given
• Exactly which parts of the system will be cleaned or tested
• How areas that can't be reached will be recorded
• A certificate or written report with before-and-after photos
• Proof of insurance and accreditations you can check
• The recommended date for the next visit

Afterwards

You get a report with photos and a certificate showing the date, location and technician, ready for your maintenance log. Keep AHU filters changed on time, because they protect the ducts, and clean grilles as part of routine cleaning. Tell us if you change how rooms are used, as it can affect the system. We’ll recommend when it should next be inspected, and we can remind you when it’s due.