Lär dig om tekniska luftrenings termer som CADR, CFM, MERV-betyg, PM2.5 och ACH på enkelt språk.
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.
MERV (Minimum Efficiency Reporting Value) är ett betygssystem från 1-20 som mäter luftfiltereffektivitet. Högre MERV-betyg fångar mindre partiklar, men begränsar också luftflödet mer. För DIY-luftrenare ger MERV 13-16 den bästa balansen mellan filtrering och luftflöde.
- 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.
CADR (Clean Air Delivery Rate) är branschstandarden för att mäta luftrenares effektivitet. Det anger volymen av ren luft som produceras per minut, mätt i kubikfot per minut (CFM). En högre CADR betyder snabbare och mer effektiv luftrening.
- 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.
CFM (Cubic Feet per Minute) mäter volymen av luft som strömmar genom en luftrenare eller ventilationssystem. Det är en kritisk specifikation som bestämmer hur snabbt en luftrenare kan behandla luften i ditt rum.
- 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.