Dental clinic in Pipera – what does AC sanitising involve for a medical space?
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We have a dental clinic with 3 treatment rooms and a waiting room in Pipera, Mitsubishi wall units (2 × 12,000, 2 × 9,000 BTU), 3 years old. At the last inspection we were asked for proof of maintenance of the air-conditioning system. What does proper sanitising mean for a medical practice and what documents do we get?
What is really happening
In a treatment room, aerosols from the handpiece and scaler load the air with fine droplets that reach the cold evaporator, and patients follow one another all day – so a permanently wet evaporator and a large flow of people breathing what the unit blows. Ventilation-system hygiene standards (EN 15780) place medical spaces in the high cleanliness class, with more frequent inspections than offices; ASHRAE 62.1 asks for annual coil inspection as a minimum, not a target. For a clinic the reasonable minimum is a full quarterly clean and weekly filters by staff.
- Inspection: assessing condition and symptoms.
- Service check: checks and measurements appropriate to the unit.
- Cleaning: removing deposits.
- Sanitising: suitable treatment of cleaned surfaces.
The actual scope is confirmed before the visit.
- European standard EN 15780 defines cleanliness classes (low, medium, high) for ventilation systems and requires periodic inspections, at least annually. [CEN / BSI, 2011]
- ASHRAE 62.1 requires visual inspection of cooling coils for cleanliness and microbial growth at least once a year and cleaning whenever fouling or microbial growth is observed. [ASHRAE, 2016]
- Split units harbour opportunistic pathogenic bacteria, and temperature, humidity and unit age influence their pathogenic potential. [Building and Environment, 2024]
- Professional cleaning of split-unit components substantially reduced bacterial and fungal counts on all measured components. [Frontiers in Public Health / PubMed Cent, 2024]
What we do on site
- Booked outside patient hours (early morning or Saturday); 4 units = about 4 hours.
- Each unit: sealed double cover, hose to the bucket, foil on the dental unit and chair; alkaline detergent, adjustable pressure wash of evaporator, roller, pan and hose; chlorine-free sanitising.
- Filters washed; the 4 outdoor units washed in place.
- Test on each: temperature, drain, noise.
- Signed intervention sheet with the date, list of units, products used (name + data sheet on request), before/after photos – on WhatsApp and to your e-mail if you wish.
- See current rates on the Prices page.
What you can do yourself
- Staff: filters weekly, with warm water; log it in the cleaning register.
- Run the units on 'Fan' for 20 minutes at closing time.
- Keep our sheets in the hygiene file.
What NOT to do
- Do not use surface disinfectant spray in the units' grilles – it does not reach the biofilm and leaves residue.
- Do not accept a 'sanitising certificate' without a sheet stating what was actually done.
Prevention
Medical practice: full quarterly clean in season (minimum twice a year), filters weekly.
When to call us
Clinic quote: 0764 012 943 or WhatsApp with photos; Monday–Saturday 08:00–20:00; Pipera is 15 minutes away.
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Sources (8)
- knowledge.bsigroup.com/products/ventilation-for-buildings-ductwork-cleanliness-of-ventilat
- www.facilitatemagazine.com/good-practice-legal/explainer/2013/04/04/bs-en-15780-ventilatio
- www.ashrae.org/file%20library/technical%20resources/standards%20and%20guidelines/standards
- www.sciencedirect.com/science/article/abs/pii/S0360132324007662
- pmc.ncbi.nlm.nih.gov/articles/PMC11350112/
- www.researchgate.net/publication/370785437_Operation_of_air_conditioners_affects_the_micro
- onlinelibrary.wiley.com/doi/10.1155/2023/8984619
- www.osti.gov/biblio/902452
The information on this page is educational and based on cited sources; it does not replace medical advice. We do not do repairs, installation or refrigerant circuit work.