±SurfaceShield™ technology combined powerful ventilation Kills Viruses and offers effective protection against bacteria, mold, and fungi growth in your bathroom or other humidity prone environments. Offering super-quiet sound rating of 1.0 sone, the SurfaceShield™ 110 CFM Exhaust Bath Fan generates powerful air circulation with minimal background noise. There are two lighting modes in the SurfaceShield™ LED light, an everyday white light perfect for task lighting and the SurfaceShield™ continuous antimicrobial mode.