Терміни повітроочисників простою мовою: CADR, CFM, MERV, PM2

Терміни повітроочисників простою мовою: CADR, CFM, MERV, PM2.5, ACH. Порівняння DIY з Dyson, Blueair. Зберіть свій CR Box менш ніж за 4000 грн.

When choosing or building an air purifier, three metrics determine whether it will actually clean your air effectively: CADR (how fast it cleans), MERV (how fine the particles it catches), and CFM (how much air it moves). Understanding these numbers lets you size a purifier correctly for any room.

Commercial air purifier manufacturers rarely publish honest CADR figures, and many budget models use low-grade MERV 8 filters that miss fine PM2.5 particles and airborne pathogens. By building a Corsi-Rosenthal box with a genuine MERV 13–16 filter, you get verifiable, independently tested performance at a fraction of the cost.

Use the detailed guides below to understand what each metric means in practice, how to calculate what you need for your room, and why our DIY kits consistently outperform commercial alternatives on all three measures.

  • Higher CFM = more air moved per minute. Divide your room volume (m³) by the desired air changes per hour to find the required CFM.
  • Our Blanc model delivers 350 CFM; the Obsidian dual-fan variant reaches 600 CFM, covering rooms up to 60 m².
  • Running costs: at 350 CFM, our kits consume 50–100W, costing roughly €35–70/year at EU electricity rates.

  • A higher CADR means the purifier cleans air faster. For a 30 m² room, aim for a CADR of at least 200 m³/h.
  • Corsi-Rosenthal boxes achieve 300–600 CFM CADR — comparable to commercial purifiers costing 5× more.
  • Look for ACH (Air Changes per Hour): for allergy or asthma sufferers, 4–6 ACH is recommended. Our kits achieve this in rooms up to 40 m².

  • MERV 13 filters capture particles down to 1 micron — including most airborne virus carriers. MERV 16 approaches HEPA performance.
  • Standard HVAC filters are typically MERV 1–4. Our kits use MERV 13–16, capturing pollen, dust, PM2.5, and most pathogens.
  • MERV ratings above 13 require adequate fan power — our kits are specifically designed to maintain airflow through high-MERV filters.

How to Choose the Right Specification for Your Room

Bedrooms & Small Rooms (up to 20 m²)

Target CADR 150–200 m³/h, MERV 13 filter, 150–200 CFM fan. Our Blanc Fanless Kit with a single quiet fan is ideal — low noise (under 35 dB) and sufficient air throughput for restful sleep.

Living Rooms & Offices (20–40 m²)

Target CADR 300–400 m³/h, MERV 13–15 filter, 300–350 CFM. Our Blanc Complete Kit with a 20×20 fan array achieves this reliably and meets Energy Star 2026 consumption limits.

Large Rooms & Open Plan (40–60 m²)

Target CADR 500–600 m³/h, MERV 14–16 filter, 500–600 CFM. Our Obsidian Dual-Fan Kit uses two 20×20 box fans in a Corsi-Rosenthal configuration, independently tested by Intertek to achieve 6 ACH in a 60 m² room.

All CADR and CFM figures for our kits are independently verified by Intertek using ANSI/AHAM AC-1 and ISO 16890 test protocols. See our certifications page for full test reports.