CADR Calculator for Dust Removal
Find the minimum Clean Air Delivery Rate for your room.
Dust is a complex mixture of skin flakes, fabric fibers, dust mite feces, pollen, soil particles, and microplastics. Particle sizes range from 0.5 μm (fine dust that stays airborne for hours) to 100 μm (visible dust that settles quickly).
For effective dust control, we recommend the standard 4.8 ACH. A True HEPA filter captures 99.97% of dust particles at 0.3 μm, which covers the vast majority of dust composition.
The key to dust control isn't just CADR — it's consistent filtration. Running a purifier 24/7 on low is far more effective than intermittent high-speed bursts. Dust accumulates continuously, so your filtration should be continuous too.
📐 How CADR Is Calculated
Formula: CADR = (Sq Ft × Ceiling × ACH) ÷ 60
AHAM recommends ≥ 4.8 ACH. Allergies: 6 ACH. Smoke/Asthma: 8 ACH.
Based on 240 CFM minimum Smoke CADR:
💡 Tips for Dust
- ✓ Run the purifier 24/7 on low — consistent filtration prevents dust accumulation.
- ✓ Vacuum and dust BEFORE running the purifier on high — this captures disturbed particles.
- ✓ HEPA filters last longer with less dust — vacuum pre-filters weekly to extend HEPA life.
- ✓ For construction dust, budget for filter replacement every 2–4 weeks during active work.