Honeywell HPA304 AllergenPlus True HEPA Air Purifier for Large Rooms

The Honeywell HPA304 is a large-room HEPA air purifier engineered for spaces up to 2,250 sq ft (465 sq ft per air change in 1 hour). It features true HEPA filtration (traps 99.97% of particles 0.3 microns and larger) plus a carbon pre-filter stage to reduce odors, smoke, pet dander, pollen, and dust. The unit offers three fan speeds including Turbo Clean mode for rapid air cycling. At 17 lbs and 22.3" tall, it's a substantial but portable tower design. Replacement filters are genuine Honeywell cartridges; the brand emphasizes that third-party alternatives may not meet performance specs. Noise levels typical of large purifiers (generally 50–70 dB depending on speed). No smart features, air-quality sensor, or app control—purely mechanical speed selection. At $235, it sits in the mid-to-premium range. Best suited for allergy sufferers and pet owners in large homes who prioritize proven Honeywell engineering and HEPA certification over connected features.