From Factory Literiture The S-Series dust collector is an enclosure-less, silent and simple to set up dust collector for your wood dust collection needs. Ideal for indoor installation, the S-500 has an operating capacity of 3000 CFM at 5.0" Wg. The fan operates at a low rpm resulting in quieter operation compared to competing indoor dust collection systems. It is equipped with the Super Bag filter which is safe for use with wood dust and is 99% efficient. Quick to install and easy to operate, it is the ideal solution for the small shop or single work-cell operation. It is designed to be used indoors and is compliant with the latest NFPA 664 guidelines - reference 8.2.2.5.1.4*(7). Key features Neat, compact, unobtrusive Quick and easy to install Bag or steel bin dust collection options Standard units in three sizes One bag size fits all Silent running 1,450 RPM fans Simple setup and maintenance Quick Fit versatile clip together duct connections Typical applications Woodwork, dust extraction from small and medium workshops Mixed workshop applications Educational workshops – ceramics, crafts, woodwork