1. Room Volume: Length × width × height = cubic feet (or meters³).
2. Target Air Changes per Hour (ACH):
3. Airflow (CFM): (Volume × ACH) ÷ 60.
Example (Jaipur living room): 16′ × 12′ × 10′ = 1,920 ft³. At 18 ACH → ~576 CFM.
4. Body & Features:
Add-ons: Night mode, ice trays (where supported), direct feed, ducting (select models).