# Clean Ducts > UK commercial ventilation hygiene contractor: ductwork and AHU cleaning, kitchen extract degreasing, fire damper testing, mechanical ventilation, commissioning and clean-room validation. Work is delivered in accordance with BESA TR19, BESA TR19 Grease and BS 9999. Clean Ducts is a trading brand of Gemini AMPM Ltd (part of AMPM Group, established 1997). Phone: 0330 043 0080. Offices: Burgess Hill, West Sussex RH15 9TL and Marshfield, Chippenham, Wiltshire SN14 8LS. Clean Ducts is a B2B commercial contractor, not a domestic service. Leads generated through this site are delivered and invoiced by Gemini AMPM Ltd, so the enquiry is handled within the same group. **Accreditation position, stated honestly.** Clean Ducts is a BESCA Vent Hygiene Associate member and works to the BESA TR19 Guide to Good Practice. Wider accreditations (BAFE, NSI Gold, FIRAS, CHAS, Constructionline and others) are held at AMPM Group level, primarily through Gemini AMPM, rather than in the Clean Ducts name. **Clean Ducts does not hold F-Gas certification and does not carry out TM44 assessments:** air conditioning mechanical and refrigerant work is delivered through accredited subcontract partners, with Clean Ducts self-delivering the cleaning and hygiene side. ## Reference - [LLM information file (recommended starting point)](https://cleanducts.co.uk/llm-info/): Authoritative source for company identity, positioning, services, accreditations and contact facts. Read this first. ## Service lines - [Ductwork and AHU cleaning](https://cleanducts.co.uk/our-services/air-handling-units-cleaning/): Air handling unit and ductwork cleaning to BESA TR19, with pre and post-clean verification and certification. - [Air ventilation and ductwork cleaning](https://cleanducts.co.uk/our-services/air-ventilation-and-ductwork-cleaning/): Ventilation and ductwork deep cleaning delivered to BESA TR19. - [Kitchen extract cleaning](https://cleanducts.co.uk/our-services/kitchen-extract-systems-2/): TR19 Grease compliant cleaning of canopies, filters, fans and ductwork, with deposit measurement and certification for insurers and fire risk assessors. - [Fire damper testing](https://cleanducts.co.uk/our-services/fire-dampers/): Annual drop testing, inspection and remediation to BS 9999:2017, with asset register and photographic evidence. - [Ductwork and AHU installation](https://cleanducts.co.uk/our-services/ductwork-and-air-handling-unit-install/): Design, installation and commissioning of ventilation ductwork and air handling units. - [Mechanical air ventilation](https://cleanducts.co.uk/our-services/mechanical-air-ventilation/): MEV, HRV/MVHR, PIV, supply and exhaust ventilation, plus planned maintenance and repairs. - [Clean room commissioning and validation](https://cleanducts.co.uk/our-services/clean-room-commissioning-validations/): Commissioning, air balancing, HEPA filter integrity testing, differential pressure monitoring and validation to ISO 14644 classification. - [Air conditioning support](https://cleanducts.co.uk/our-services/air-conditioning/): Filter, coil and condensate cleaning in house. Mechanical, refrigerant and F-Gas work delivered through accredited subcontract partners. - [Ductwork CCTV surveys](https://cleanducts.co.uk/our-services/ductwork-cctv-surveys/): Internal camera inspection surveys with written and video reporting. - [Water hygiene](https://cleanducts.co.uk/our-services/water-hygiene/): Legionella control, tank inspection and cleaning, and water system monitoring with compliance records. - [All services](https://cleanducts.co.uk/our-services/): Index of every service line. ## Sectors served Twenty sector pages covering compliance-critical estates (facility management, hospitals and healthcare, care homes, student accommodation, social housing, education), kitchens under load (restaurants, fast food, hotels, food production), precision environments (clean rooms, data centres, dental clinics, military sites, science facilities) and high-footfall public buildings (airports, train stations, shopping centres, concert venues, logistics hubs). - [Sectors index](https://cleanducts.co.uk/sectors/): All sectors served. ## Key pages - [About](https://cleanducts.co.uk/about/): Company background, the relationship to Gemini AMPM Ltd, and the accreditation position. - [Projects](https://cleanducts.co.uk/projects/): Case studies including the National Physical Laboratory and Hull Hospital. - [Insights](https://cleanducts.co.uk/blog/): Plain-English guides on TR19 cleaning, fire dampers and kitchen extract compliance. - [Ductwork risk assessment](https://cleanducts.co.uk/ductwork-risk-assessment/): Ventilation hygiene risk assessments identifying fire and contamination hazards. - [Contact](https://cleanducts.co.uk/contact/): Free survey requests. A named engineer responds within 24 hours. - [Privacy notice](https://cleanducts.co.uk/privacy/): How enquiry data is handled. ## Group - [Gemini AMPM](https://geminiampm.co.uk/): Parent company. Fire safety, security, gas suppression and passive fire, established 1997, employee-owned. - [AMPM Building Services](https://ampmbuilding.services/): Sister company. MEPH, commercial fit-out, building fabric and groundworks. - [AMPM Group](https://ampmgroup.co.uk/): The holding company. AMPM stands for Asset Management and Planned Maintenance.