Beam. The top-of-line Serenity IQS series comes with a 10-year warranty, a self-cleaning Gore-Tex fabric HEPA filter, optional outside venting, and an anti-microbial bucket to stop microbe growth between emptying. An LCD display provides real-time system maintenance alerts. The motor delivers 600 to 640 air watts of power depending on the system size, which can be calibrated for an overall cleaning area from 7,000 to 12,000 square feet. A sound-reduction package includes an anti-vibration mounting system, canister sound insulation, and an optional muffler that reduces overall power unit noise to as low as 65 decibels. 800.369.2326. www.beamvac.com.