Enter the floor area, pick the room type, and we calculate the required Clean Air Delivery Rate (CADR) and show you the exact unit count from our range. No marketing approximations — straight ACH × volume maths.
Pick a room-type preset to load the typical target ACH for that use case, or override manually.
Formula: Required CADR = Floor area × Ceiling height × Target ACH. Target ACH values follow each standard's published guidance. The recommended unit count then rounds up to satisfy the target.
Three configurations that hit your target. Rounded up so you don't underspec.
Rated maximum airflow for each unit in our range, with the room size it covers at the common standard ACH targets. Coverage assumes a 2.8 m ceiling — the calculator above adjusts for your actual height.
Figures are rated maximum airflow (units run quieter below max). Coverage assumes a 2.8 m ceiling; taller ceilings reduce it proportionally — the calculator above handles this automatically. Prices ex VAT.
Standard ACH × volume — no inflated CADR, no marketing assumptions.
Room volume (m³) = Floor area × Ceiling height Required CADR (m³/h) = Room volume × Target ACH Unit count = CEIL(Required CADR ÷ Unit CADR)
Real-room CADR delivery is reduced by 10–25% by furniture, partitions, intermittent occupancy, and supply-air mixing inefficiency. We round unit counts up so you hit the target on a bad day, not just on a calm-air test bench. If your room is unusually open-plan or unusually obstructed, talk to us before ordering — we'll do a free CFD-light estimate.
Share the calculator output and your floor plan — we'll confirm the spec, price it in your currency, and ship a 30-day trial unit so you can verify on your real-world airflow.