HEPA Filters (High Efficiency Particulate Air filters) are used throughout the laboratory for filtration of radioactive and non-radioactive particles. Common uses are in exhaust hoods to ensure that radioactive particles are not released to the air and in vacuum cleaners to make sure that fine particles of hazardous substances such as lead and asbestos are not re-suspended in the air where work is being done. Their use can be required as part of the Work Controls instituted during an experimental or work review. The need for HEPA filtration on a device can be recommended or required by various personnel. The Industrial Hygiene Group is the prime provider of surveillance tests that determine if the HEPA filter is clogged or compromised in its filtering capacity. Details of this program are found in several IH Standard Operation Procedures.