RENPHO Air Purifier for Allergies and Asthma. Breathe fresh, clean air with the RENPHO R-M003 True HEPA air purifier. This air purifier features a 4-in-1 H13 True HEPA filtration system to quickly and effectively purify indoor air. Cleans spaces up to 2420 ft² (225 m²). Suitable for larger rooms or spaces. The powerful air purifier also has a PM2.5 readings display and an indicator that changes color, which makes it easy to monitor the air quality.