Air purifiers for nursing homes: sizing wards and common areas

Key takeaways

• Size wards, the dining hall and common areas separately rather than applying one figure to the whole building.
• Treat shared wards like clinical spaces and aim higher on air changes per hour than a general office would need.
• A unit built for continuous operation can run overnight alongside the aircon without needing to be switched off.
• Verify any supplier's medical-grade claim against a listed certification rather than the word alone.
• A room-by-room survey gives an accurate unit count instead of a single estimate for the whole facility.

Why a nursing home needs room-by-room thinking, not one blanket figure

A nursing home is not one room. It is a mix of shared wards, a dining hall, corridors, an activity room and sometimes a small clinic bay, and each has a different floor area, ceiling height and occupancy pattern. Applying a single purifier model across all of them, sized for whichever room is loudest about air quality, usually leaves the rest under-served.

Wards hold residents for long stretches, often overnight, with recirculating aircon and limited natural ventilation. The dining hall sees short bursts of high occupancy at mealtimes, with cooking odours and close seating. Corridors and common areas are transit spaces with lower dwell time but higher foot traffic. Each of these calls for its own sizing decision rather than a facility-wide guess.

Our air purifier size calculator works from floor area, ceiling height and a target number of air changes per hour, which makes it straightforward to run the same formula room by room instead of once for the whole building.

Sizing shared wards separately from the dining hall

A shared ward houses residents who may already have reduced respiratory reserve, so it is reasonable to size it closer to a clinical space than to a bedroom at home. Recommended air changes per hour for clinics generally sit at five or more, and a ward with several beds and continuous occupancy fits that bracket better than the three to four changes typical of an ordinary home room.

The dining hall behaves differently. Occupancy peaks sharply at set mealtimes, cooking and food smells add odour load, and the room may double as an activity space between meals. Sizing it around the general commercial guidance of four to five air changes per hour, applied to its own floor area and ceiling height, keeps the calculation honest to how the room is actually used rather than borrowing a figure from the wards.

Run the calculator separately for each space and you end up with a defensible, room-specific unit count instead of one number stretched across very different rooms.

Continuous overnight operation alongside the aircon system

A common complaint from night staff is that a shared ward feels stale by early morning even though the aircon has run all night. Aircon cools and recirculates air, but recirculation alone does not remove particles or actively reduce pathogen load. It is common for the same body of air to keep cycling through the room without much fresh replacement, which is exactly when staleness builds up.

A purifier addresses a different part of the problem than the aircon does. It is built to run continuously, drawing air through filtration and active sterilisation stages around the clock rather than only when someone remembers to switch it on. Placing it away from the direct aircon airflow, so the two systems are not fighting each other for the same air pocket, matters more than most facilities expect.

Running the aircon and a correctly sized purifier together, both continuously, addresses ventilation and active air treatment as two separate jobs rather than expecting one system to do both.

Verifying a supplier's medical-grade claim before signing

"Medical-grade" gets used loosely across the air purifier market, so it is worth checking what actually backs the term before it goes into a procurement decision. Look for a specific, checkable certification rather than the phrase alone. AIRE units carry an FDA Class 2 medical device listing alongside H13 medical-grade HEPA filtration, CE, RoHS, ISO 9001 and ISO 14001 certification, all of which can be checked against the issuing body's own records rather than taken on trust.

Ask any supplier to point to the specific certification behind their claim, not just the label on the box. Our own approach to this is set out plainly on our claims verification page, which explains what we will state, what we will not, and how to check a brand's numbers, including ours.

A facility handling vulnerable residents has more reason than most to ask this question before it signs anything.

Getting a full-facility survey

Rather than estimating from a floor plan alone, a facility-wide survey walks each ward, the dining hall and common areas in person, measuring floor area and ceiling height and noting occupancy patterns before recommending a unit count. That avoids both over-buying for rooms that do not need it and leaving a busy shared ward under-sized.

For a facility already managing residents with varying health needs, this kind of survey also flags which rooms deserve priority if a phased rollout is more practical than fitting out the whole building at once. Starting with the highest-occupancy wards and the dining hall, then extending to common areas, is a reasonable way to sequence the spend.

A purifier chosen for elderly residents at home follows the same sizing logic scaled down, which is a useful reference if you are also fielding questions from family members about what they run at home.

Next step

If you manage a nursing home and want an accurate unit count for wards, the dining hall and common areas rather than a single facility-wide guess, a free room-by-room Air Report walks each space and sizes it on its own.

Frequently asked

Should nursing home wards and the dining hall be sized separately?

Yes. Wards hold residents for long stretches and are reasonably sized closer to clinical air-change targets, while the dining hall sees short bursts of high occupancy at mealtimes and is better sized on general commercial guidance. Running one figure across both usually under-serves whichever room was not used to set it.

Can a unit run continuously overnight alongside the aircon?

Yes. A purifier is built to run around the clock and handles filtration and active sterilisation, which is a different job from the aircon's cooling and recirculation. Placing it away from the direct aircon airflow avoids the two systems working against each other in the same room.

How can a nursing home verify a supplier's medical-grade claim?

Ask for the specific certification behind the claim rather than accepting the phrase alone, such as an FDA Class 2 listing, H13 medical-grade HEPA, CE, RoHS or ISO certification, and check it against the issuing body's own records. A supplier unwilling to name a checkable certification is a reasonable reason to keep asking.

Related reading

• Choosing an Air Purifier for Elderly Parents in Singapore
• How We Verify Our Claims