t: 020 8337 3516   f: 020 3277 1015   e: info@hawtl.co.uk

Air Hygiene Services

Howlett Associates offer a full range of air hygiene services including ventilation system inspections, dust thickness testing, wet thickness testing, bacteriological testing, humidity levels, carbon dioxide levels, kitchen extract cleaning, ventilation ductwork cleaning, AHU cleaning and heating/cooling coil cleaning

The health and Safety Executive Guidance HSG 202: General Ventilation in the Workplace; Guidance for employers; provides a summary of the actions required to ensure compliance with current legislation.

Specific guidance from HVCA TR/19 and CIBSE TM26 should be followed, which details inspection and cleaning frequencies

The Control of Substances Hazardous to Health Regulations 1999 (COSHH) regulations 6, 7 and 8 require that you undertake a risk assessment and prevent or control exposure of your employers to substances hazardous to health by using suitable control measures.

Maintenance, examination and testing of the control measures are required on ventilation plant to meet requirements of regulation 7 and are covered by regulation 9.

Workplace (Health & Safety and Welfare) Regulations 1992 Approved Code of Practice and Guidance L24 Regulation 5 requires the mechanical ventilation systems used for providing general ventilation are maintained (including cleaned as appropriate) in an efficient working order and in good repair. Regulation 6 requires that you ensure effective ventilation for any enclosed workplace by providing a sufficient quantity of fresh or purified air. The associated Approved Code of Practice states Mechanical ventilation systems (including air conditioning systems) should be regularly and properly cleaned, tested and maintained to ensure that they are kept free from anything which may contaminate the air.

Air Hygiene Reference Documents

  • CIBSE Technical Memorandum TM26, Hygienic Maintenance of Office Ventilation Ductwork.
  • HVCA Guide to Good Practice, Cleanliness of Ventilation Systems TR/19
  • BSRIA Facilities Management Specification, Standard Specification for Ventilation Hygiene FMS 1
  • HSG202 General Ventilation in the Workplace, Guidance for Employers.
  • HSG132 How to deal with Sick Building Syndrome, Guidance for employers, building owners and building managers.
  • CCFRA Guideline No.12 Guidelines on air quality standards within the food industry.
  • HTM 2025 Ventilation in healthcare premises.

Click here and email us for your free air hygiene technical sheets


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Howlett Associates Water Treatment Ltd
1st Floor, Park House, 1 - 4 Park Terrace,
Worcester Park, Surrey, KT4 7JZ.
t: 020 8337 3516
f: 020 3277 1015
e: info@hawtl.co.uk
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