Clean Air Tested Large Rooms: HEPA Sensor UV-C Showdown In our latest test, we explored the GermGuardian AC3000B Air Purifier, designed for rooms up to 1043 sq. ft. We were impressed by its dual filtration system: the True HEPA filter captured 99.97% of particles as small as 0.3 microns, while the UV-C light neutralized airborne microbes. The air quality sensor was a standout feature, automatically adjusting fan speeds based on pollution levels. For larger spaces, the powerful AC3000B performed without fail, maintaining steady fresh air circulation. While the UV-C light’s sanitizing effects were subtle, the HEPA sensor’s intelligence ensured optimal efficiency without constant manual oversight. Overall, this purifier delivered reliable, quiet purification, making it a strong contender for expansive homes seeking balanced performance.