How to Protect Immunocompromised Patients in Your Clinic
A practical checklist for protecting immunocompromised patients in Singapore clinics: zoned waiting, 6+ air changes per hour and active air sterilisation.
Why immunocompromised patients face higher airborne risk in clinics
If you run an oncology, renal, geriatric or other specialist practice, your patients arrive with defences already lowered — by chemotherapy, dialysis, biologics, long-term steroids or simply age. They then sit in a shared waiting room alongside walk-in visitors, some of whom are incubating influenza or another respiratory infection and do not yet know it. Symptom screening at the counter will never catch every case.
That is the core problem: your most vulnerable patients share air with your most infectious visitors, at the exact moment their defences are lowest. Masks, hand hygiene and surface cleaning all matter, but none of them deals with the air itself.
The good news is that clinic air is controllable. With sensible zoning, the right air-change rates and properly sized equipment, you can substantially reduce the airborne load your patients are exposed to — without renovation works.
A three-part checklist for protecting vulnerable patients
1. Zone or fast-purge your waiting area
Where layout allows, seat immunocompromised patients away from the general queue — a corner, a side room, or a dedicated appointment block early in the day before the room fills. Where it does not, compensate with throughput: a purifier sized to turn the waiting-room air over five to six times an hour continuously dilutes whatever an undiagnosed visitor releases.
2. Push consult and treatment rooms to six or more air changes per hour
Public-health guidance since the pandemic (including the US CDC) recommends targeting at least 5 air changes per hour of clean air in occupied spaces. For clinics we recommend 5 or more, and 6 or more in consult and treatment rooms, where a vulnerable patient sits close to staff for extended, often unmasked conversation. Most clinic air-conditioning simply recirculates and delivers far less than this on its own, so portable H13 units usually do the heavy lifting.
3. Choose active sterilisation, not passive capture alone
A standard HEPA purifier captures pathogens and holds them on the filter. An active system goes further and neutralises them. For rooms where patients cannot afford exposure — and where your staff handle the filters at change time — that difference matters. We cover exactly how much difference below.
How much clean air does each room need?
Use one simple formula: required CADR (m³/h) = floor area (m²) × ceiling height (m) × target air changes per hour. For a typical Singapore clinic with 2.6 m ceilings, that works out as follows.
| Room | Typical size | Target ACH | CADR needed | Recommended unit |
|---|---|---|---|---|
| Consult room | 12 m² | 6+ | ~190 m³/h | Fillo Plus (CADR 300) |
| Treatment room | 16 m² | 6+ | ~250 m³/h | Fillo Plus (CADR 300) |
| Waiting area | 30 m² | 5–6 | ~390–470 m³/h | Classic 400S (CADR 480) |
| Large waiting hall | 60 m² | 5 | ~780 m³/h | Pro 800S (CADR 800) |
Two practical notes. First, round up — CADR is measured at top fan speed, and you will often run one step lower for noise. Second, in a small consult room the Fillo Plus actually delivers closer to nine air changes per hour, which is exactly the buffer you want after an aerosol-generating examination. Our air purifier size calculator does the arithmetic for any room.
Why passive HEPA alone is not enough for these patients
H13 is defined under EN 1822 as capturing at least 99.95% of particles at the most-penetrating particle size — which is why every AIRE room purifier uses H13 medical-grade HEPA as standard. But capture is only half the job. Pathogens trapped on a filter do not vanish; they decay slowly over hours while the filter sits in an occupied room.
That is why we pair H13 filtration with active sterilisation — UV-C light plus copper-silver ion technology. In chamber testing, this combination eliminated more than 99.99% of tested airborne pathogens (E. coli, Staphylococcus albus, Influenza A) within 60 minutes, versus roughly 4 hours 23 minutes for the same organisms to decay passively on a standard HEPA filter.
For a specialist clinic, that gap is the whole point. When patients cannot afford exposure, a system that neutralises what it captures within the hour supports infection control in a way passive filtration cannot. And because the UV-C operates inside a sealed chamber, it never reaches patients or staff. The distinction is worth understanding before you buy — our guide to air purifiers vs air sterilisers walks through it.
The setup we recommend for a typical specialist clinic
We already support dental and specialist clinics across Singapore, and the pattern that works is straightforward.
- Fillo Plus in every consult and treatment room. CADR 300 m³/h in a slim 244 mm cylinder that tucks beside the examination couch, with UV function, a dust sensor and operation under 53 dB — quiet enough not to intrude on a consultation.
- Classic 400S in the waiting area. CADR 480 m³/h with 8 fan speeds, so you can run it hard at peak load and drop towards 30 dB in quiet hours. It includes a child lock for family-facing practices.
- Pro 800S for larger clinics. CADR 800 m³/h covering up to 96 m², on castors so staff can reposition it, with a PM2.5 sensor and an air-quality light that visibly reassures patients the air is being managed.
AIRE holds FDA Class 2 medical device listing plus CE and RoHS compliance, and is certified to ISO 9001 and ISO 14001 — the paperwork your practice manager and auditors will ask to see.
Prove it in your own rooms before you commit
Air-quality claims are easy to make and hard to feel. So we do not ask specialist clinics to take our word for anything: we place the units in your actual rooms on a free 30-day pilot with zero upfront cost. Run them through real clinic days, check the noise level during consultations, then buy, rent or return.
Purified air is one layer of a wider protocol — see our guide to clinic infection control and air purification for how it fits alongside cleaning, layout and scheduling. For sizing advice on your specific floor plan, WhatsApp or call us on +65 8082 3699.
Frequently asked
Can an air purifier prevent infections in immunocompromised patients?
No single device can prevent infection, and we never promise that. What medical-grade purification does is reduce the airborne pathogen load patients are exposed to, which supports your wider infection-control measures — masking, hand hygiene, cleaning and sensible scheduling. Think of it as continuously lowering exposure in every occupied room.
How many air changes per hour should a specialist clinic aim for?
Public-health guidance since the pandemic, including from the US CDC, recommends at least 5 air changes per hour of clean air in occupied spaces. We recommend 5 or more for general clinic areas and 6 or more for consult and treatment rooms. Multiply floor area by ceiling height by your target ACH to get the CADR you need.
Is UV-C sterilisation safe to run while patients are in the room?
Yes. The UV-C lamp operates inside a sealed chamber within the purifier, so the light never reaches occupants — it only treats the air passing through the unit. That means it can run continuously during clinic hours, including around elderly and immunocompromised patients.
Which AIRE purifier suits a small consult room?
The Fillo Plus. It covers rooms up to 30 m² with a CADR of 300 m³/h, runs under 53 dB so it will not intrude on consultations, and its slim cylinder takes up minimal floor space. In a typical 12 m² consult room it delivers well above the 6 air changes per hour we recommend.
Related reading
- Where Air Purification Fits in Your Clinic's Infection Control Plan
- Clinic Waiting Room Air Purifiers: What Actually Works
- Medical-Grade vs Consumer Air Purifiers: The Real Difference
Not sure which model fits?
Tell us your space and we'll recommend the right AIRE unit — or set up a 30-day pilot with zero upfront cost.