One drawing explains every purifier decision: where particles enter, why room volume is the number that matters, and what a purifier can and cannot reach. Toggle the room state, then size yours on the control panel.
Pollen, traffic soot and cooking smoke re-enter constantly. Clean air is a rate you maintain, never a level you reach once.
The purifier serves every cubic meter, not the corner it sits in. That is why the calculator below starts from your room, not from a product.
Smoke CADR is third-party measured airflow of clean air. Ionizer and plasma modes are not, and this drawing treats them as decoration.
Delivers 4.0 air changes per hour. Boxes often print CFM: look for 141 CFM or higher.