Nilfisk ALTO Aero 21 HEPA - Contractor-Grade Wet/Dry HEPA Vacuum Airflow: 127 CFM / Waterlift: 84 Inches Push & Clean: Automatic filter cleaning system keeps suction high Certified HEPA Filter (99.97% @ 0.3 microns) exceeds industry standards for hazardous collection (ie. lead, silica, asbestos, mold) Silent Power: 64 dB(A) Blower Port