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Standards
The increased awareness of the indoor environment together with the introduction of legislation has created a requirement for standards and guidelines to be set.
The various standards and recommendations currently available are as follows:
| Usage | Hours/day | Frequency |
| Heavy | 12-16 | 3 monthly |
| Medium | 6-12 | 6 monthly |
| Light | 2-6 | Annually |
| Readings | Description | Action |
| Micron readings between 0 - 50 | Clean | Report | Micron readings between 50 - 200 | Acceptable | Monitoring scheduled | Micron readings between 200 - 300 | Dirty | Program cleaning |
| Micron readings between 300 - 600 | Heavy | Urgent cleaning | Micron readings 600+ | Extremely Heavy | ASAP Closure of system |
AIB (Association of British Insurers) recommends that an extract system in a commercial kitchen should be cleaned and certified anything from annually to monthly, depending on the usage load
Health Technical Memorandum HTM 03-01 – Specialised ventilation for healthcare premises Part B : Operational management and performance verification has introduced new practices for the management of healthcare ventilation systems. Critical care systems are now to be inspected on a quarterly basis and all systems are to be inspected on an annual basis. Findings should be recorded and areas with visible dirt or deposits should be cleaned.
Health and Safety Guidance Notes 202 General Ventilation in the Workplace, Guidance for Employers “as a general rule, if you run your finger along the opening of a duct and it collects dust then it probably needs cleaning”.
CIBSE TM26: 2000 Hygienic maintenance of office ventilation ductwork
EVHA Cleaning and Hygienic Management of Ventilation Systems
NADCA Assessment, Cleaning and Restoration of HVCA Systems (2006)
Further details of these publications are in our reference section.
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