Office and co-working air purification

An office is several rooms, not one number

If you are responsible for air quality across an office floor, or across several branch offices, the first difficult question is rarely "which unit" — it is "how many, and where". Open desking, enclosed meeting rooms, a pantry and a co-working hot-desk area all move different volumes of air and hold different numbers of people at different times of day. A single figure per floor does not survive contact with the floor plan any better than in a facility with wards or dormitory rooms. Our sizing guide for office air purifiers and our guide to how many units your office actually needs both start from the same method: size each enclosed zone on its own, then add the zones together.

The sizing arithmetic, worked through

Required clean-air delivery (CADR, m³/h) equals floor area (m²) × ceiling height (m) × target air changes per hour (ACH). US CDC guidance sets a floor of at least 5 clean-air changes per hour for occupied indoor spaces, a sensible starting target for open desking and meeting rooms alike.

Take a 60 m² open-plan floor with a 2.7 m ceiling. At 5 ACH that is 60 × 2.7 × 5 = 810 m³/h. That sits right at the top of the Pro 800S's 800 m³/h CADR, so specifying a single unit leaves almost no headroom; splitting the floor with two Classic 400S units (960 m³/h combined) positioned at opposite ends covers the requirement with margin and mixes air more evenly across an open floor than one unit in a corner.

A 12 m² enclosed meeting room with the same 2.7 m ceiling, sized to a higher 6 ACH because of dense occupancy for the room's size, needs 12 × 2.7 × 6 = 194 m³/h — comfortably inside a single Fillo Plus (CADR 300). A 90 m² co-working floor with a 2.8 m ceiling at 5 ACH needs 90 × 2.8 × 5 = 1,260 m³/h, which a Pro 800S paired with a Classic 400S (1,280 m³/h combined) covers, though hot-desking density and back-to-back meeting room bookings can push the honest target higher — our guide to sizing a co-working space and our sizing calculator both work through that adjustment.

Matching the unit to the zone and the season

Desk zones and small meeting rooms suit the Fillo Plus or Classic 400S; a larger open floor or a co-working common area needs the Pro 800S's higher CADR and dual intake. Singapore's flu activity runs year-round with mid-year and year-end peaks, which is when facilities teams ask hardest about shared-air risk in an office — our guide to office air quality across flu season sets out what H13 HEPA filtration and active sterilisation can honestly cover and what they cannot. Workplace Safety and Health indoor air guidance is often assumed to apply only to factories and industrial premises; our guide to WSH indoor air quality guidance for a normal office explains where it genuinely applies. App-connected units such as the Fillo Plus run on Tuya WiFi, which raises a fair question about what data the app collects — our guide to what an app-connected purifier collects covers that against PDPA. A co-working operator considering air quality as a listed amenity should verify sizing and servicing capacity before it goes on the listing page, the subject of our amenity decision checklist.

Budgets, rollouts and servicing across sites

We do not publish a price list, because room count and coverage area vary too much between one office and the next; our budgeting framework guide sets out how to build a reasonable range before requesting exact quotes. A company with several branches gains more from one standard specification, procured and serviced centrally, than from approving requests branch by branch as they arrive — our guide to rolling out air purifiers across branch offices covers how to set that standard and coordinate servicing visits. Energy use is a fair question for a sustainability report; exact power draw figures sit in the product specification sheet rather than a general estimate, which our guide to air purifier energy use in a sustainability report explains how to request. Developers sometimes ask whether air purification counts toward green building certification criteria; our guide to green building certification context gives honest context without overstating a specific point contribution. Units are available to purchase or on serviced rental — filters, parts, preventive visits and two-way delivery included — quoted once the floor is sized; a one-month rental pilot exists for a branch or floor that wants units in place before a wider rollout, priced as rental rather than as a trial.

What we will not claim

We will not tell you that air purifiers reduce sick days, prevent flu transmission, or eliminate airborne risk in an office. We have no data linking our units to those outcomes in an occupied office, so we do not make the claim, and the flu-season guide linked above is explicit about that limit. What we will state and stand behind is clean-air delivery for a measured space, backed by the manufacturer's chamber-test data and the certifications listed on our verification page: H13 HEPA specification, CE, RoHS, ISO 9001/14001 management systems, and an FDA Class 2 medical device listing held by the manufacturer.

The next step is measuring the floor, not guessing at it

Before we recommend units for any floor, meeting room or co-working area, we run a Clinic Air Report: a S$150 site visit, minimum two rooms, every room measured on site, report emailed within two working days. If a specified unit does not reach the report's stated air-change figure once installed, we upgrade or add a unit at no extra cost. From there, our product range, our commercial rental page and our contact page cover procurement, whichever way the budgeting framework points you.