The Aprilaire 5000 and Blueair Blue Pure 211I Max serve fundamentally different roles, with the Aprilaire designed for whole-home HVAC integration (per manufacturer specs) and the Blue Pure for standalone room use up to 635 sq ft at 350 cfm CADR (per Blueair data). The Blue Pure wins on portability and features while the Aprilaire excels only when whole-house coverage is required. Direct compar...