HEPA vacuum requirements as defined by the EPA: "HEPA vacuum means a vacuum cleaner which has been designed with a high-efficiency particulate air (HEPA) filter as the last filtration stage. A HEPA filter is a filter that is capable of capturing particles of 0.3 microns with 99.97% efficiency. The vacuum cleaner must be designed so that all the air drawn into the machine is expelled through the HEPA filter with none of the air leaking past it."

The HEPA cartridge filters included with these wet/dry vacs have been individually tested and certified to have a minimum efficiency of 99.97% at .3 microns in accordance with IEST-RP-CC001 test requirements and meets the EPA's Lead Renovation, Repair and Painting (RRP) requirements.