All stainless steel construction. This unit is equipped with a true ULPA Filter (U15) located upstream of the motor. This unit is EMI/RFI Shielded and will not disrupt computers and other sensitive electronic equipment. This unit is static free and ESD safe. Any static produced while vacuuming is quickly and effectively discharged to the ground. This unit is cleanromm compatible and can be used in the pharmaceutical industry. This unit is designed for general cleanup in contamination controlled environments. This is a dry only vacuum cleaner. All of our ULPA vacuum cleaners are Aerosol Leak Tested before leaving our facility.