Cen-Tecs Aura 94423 is specified to permit the contractor, remodeler, builder, or woodworking professional to capture the dust and debris generated by power tools as the dust is being generated. The 94423 permits the power tool to be operated through the vacuum and as the power tool turns on, the vacuum operates to insure dust collection. When the power tool shuts off the vacuum continues to run for five seconds to clear the tool and hose and the automatic filter shaker activates for ten seconds to clean the nylon pre-filer and HEPA filter of fine dust. Also features a 16 ft. 1-1/4 in. x 1-1/2 in. conical electro-static dissipative (ESD) hose with three quick change tool adapters to fit to all major brands of power tools The Aura is a 6 Gal. HEPA dry vacuum designed for source capture of dust created by power tools, drywall sanding, masonry cutting, and wood working as the dust is generated to protect you and keep the worksite clean. The vacuum has a two stage by pass motor that provides 126.5 CFM of airflow and 94.5 in. of water lift. The plug on the control panel permits control of the vacuum through the power tool when the power tool is energized. The Aura has two primary levels of filtration for fine dust. A durable nylon filter bag surround and protects the HEPA filter from everything but very fine dust helping to preserve the HEPA filter. The second HEPA filter captures 99.997% of all dust 3 microns and larger.