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Air purifier room size calculator
Estimates. AHAM rule: CADR ≥ 2/3 × area × (ceiling ÷ 8). ACH target: CADR = volume × ACH ÷ 60. Electricity = ENERGY STAR kWh/yr (16 h/day) × rate. CADR is measured at top fan speed. Data: ENERGY STAR (2026-10-17), rates: EIA July 2026 (preliminary).