08:00 The building takes its first breath
A building breathes around eight times an hour. Behind the grilles, its kitchens, risers and dampers collect the grease, dust and fire risk nobody sees. We keep the whole system clean and safe: duct hygiene, kitchen extract, fire dampers and ventilation, all cleaned, tested and certificated to TR19.
10:30 On the tools
Two jobs, one team: the air a building breathes, and the grease, dust and dampers that put it at risk. Every line below is cleaned, tested and certificated by the same engineers.
13:00 How every job runs
The promise hasn’t changed in a decade. Every job (a school AHU or a takeaway’s grease duct) runs the same three-step spine.
Ductwork, grease extract and AHUs cleaned to TR19. Access panels opened, deposits removed and measured, before/after photographed.
Fire dampers dropped, systems balanced, airflows measured, clean rooms validated against the standard that applies.
Reports and certificates issued and filed: audit-ready evidence in your inbox, not a verbal all-clear.
15:45 Proven, not promised
Photographs, deposit measurements, test results, certificates, all filed and sent before we leave site. If it isn’t documented, it didn’t happen; so we document everything.
16:30 Recent work
Ventilation, ductwork and validation projects delivered across commercial, healthcare and science estates.
A ventilation camera survey of high-rise ductwork in Kensington and Chelsea for property and construction consultancy Calford Seaden.
Read the case study →Clean Ducts was called in to remedy failed ductwork at Castle Hill Hospital, Hull, restoring a clean-room ventilation system with survey, cleaning and testing.
Read the case study →Clean Ducts cleaned the full supply and extraction ventilation system at the National Physical Laboratory to BESA TR19 and HTM03, completed in ten days.
Read the case study →17:30 Where we work
18:15 Worth knowing
When grease ignites, a kitchen extract system can act like a chimney. Regular TR19 Grease cleaning of ductwork, canopy and fan is how you keep fire risk down.
Read →TR19 Grease-compliant kitchen extract cleaning for high-use fast food and QSR kitchens, with certified photographic reports your insurer needs.
Read →BESA created TR19 to define how ventilation systems should be cleaned. Here is what the standard covers, why it matters, and how often your building needs it.
Read →18:45 The detail
TR19 is BESA’s Guide to Good Practice for the internal cleanliness of ventilation systems, and it is the benchmark for everything we do. In practice that means ductwork cleaning that strips out the dust and debris your system collects as it runs, AHU cleaning so the plant that moves your air is as hygienic as the ducts it feeds, and deposit measurements taken before and after, so the result is proven rather than assumed. Where you cannot see the problem, duct camera inspections and smoke testing find the blockages and failures hiding behind the grilles. Many of our supervisors and engineers have over 30 years in the ventilation industry, and as a Vent Hygiene Associate member of BESCA our work is independently verified. Whether your building is an office, a school, a hotel or a clean room, the standard it is cleaned to does not change.
Every service in a commercial kitchen pushes grease-laden air into the extract system, and the layer it leaves behind is a fire risk sitting directly above the cooking line. Regular kitchen extract cleaning removes that build-up, keeps grease and odour moving efficiently out of the kitchen, and keeps you compliant with fire safety and health regulations. We design and install kitchen extraction systems that meet regulatory standards from day one, then keep them clean for the life of the kitchen, so the same team that built the system answers for its condition. The duty is the same whether you run one restaurant kitchen or a fast food estate with dozens of sites: deposits measured, photographed and certificated to TR19 Grease, so you can show exactly when the system was cleaned and to what standard.
Fire dampers are the shutters inside your ductwork that close to hold back fire and smoke between the compartments of a building, and they only earn their keep if they actually close. Annual fire damper testing covers locating and accessing every damper in the system, drop testing each one to prove it releases and closes, cleaning and resetting it, and recording the result with photographs. Any damper that fails is reported so it can be repaired, because an untested damper is an unknown sitting in your fire strategy. Comprehensive testing keeps your systems compliant with fire safety regulations, reduces fire risk and improves the safety of the building for everyone who uses it.
A building breathes what its ductwork holds. Cleaning your ducts improves the air people breathe, boosts system efficiency, reduces energy costs and prevents the potential health hazards that come from dust and debris build-up. Filtration matters just as much, and we advise on the best filtration options for your system so air quality, energy efficiency and long-term performance improve together. Where fresh air rates are critical, mechanical air ventilation keeps supply and extract in balance, and in hospitals and healthcare estates or education buildings, where people have the least choice about the air they breathe, hygiene is part of the duty of care. Planned maintenance keeps a clean system clean: routine inspection and cleaning prevent problems before they arise, keep the system operating at peak efficiency and extend the life of your equipment, rather than waiting for a failure to force the issue.
Every building has unique needs, so every job here starts with a survey rather than a guess. A ventilation survey assesses the performance and condition of your current systems: what needs cleaning, what needs testing, where access panels need installing, and where the quickest gains in ventilation and air quality sit. From that we scope the work and tailor the solution to your space, whether that is an office, a university, a hotel, a restaurant, a hospital or a clean room. Where systems are new, altered or critical, commissioning and balancing brings them to optimal capacity, and validation proves the system is performing as intended and meeting the standards that apply to it. If a system needs replacing rather than rescuing, our ductwork and AHU installation team handles the design and the fit, and when a fault does appear, prompt diagnosis and reliable repair restore the system with minimal downtime. The survey is free, and it ends the way every job here ends: with a clear record of what your building needs, and the evidence to prove what was done.
19:00 Same group, same standard
Clean Ducts is the ventilation-hygiene brand of Gemini AMPM Ltd, the employee-owned firm that has protected the South East’s buildings since 1997.
Gemini keeps the night. AMPM Building Services keeps the day. We keep the loop that never stops: the air, and everything it moves through. Same group. Same standard. Same name on the certificate. And the name means it: AMPM stands for Asset Management and Planned Maintenance, the discipline every one of these jobs runs on.
About the group24/7 The air doesn’t clock off
Book a free site survey and a named engineer comes back within 24 hours. Emergency? The group line is answered by an engineer, every hour of every day.