The Blue Signature SP4i is optimized for rooms up to 705 square feet, where it delivers an impressive 4.8 air changes per hour (ACH)—ensuring consistently clean, refreshed air throughout the space.

Thanks to its high-performance design, the SP4i can also be used in larger rooms; however, the number of air exchanges per hour will naturally decrease as room size increases.

With industry-leading Clean Air Delivery Rates (CADR) of 455 for Smoke, 434 for Dust, and 450 for Pollen, the SP4i is engineered to provide exceptional air purification for a wide range of indoor environments.