HEPA Filter
Description
An extremely dense, pleated mechanical air filter that is commonly used in air purifiers. A HEPA filter (High-Efficiency Particulate Air) is the gold standard for air purification, designed to capture at least 99.97% of airborne particles that are 0.3 microns in diameter, such as dust, pollen, mold, and bacteria. HEPA filters are composed of randomly oriented fibers (usually fiberglass) that stop and retain particulates as the air flows through it. the US EPA has designated 0.3 microns as the most difficult size particle to capture. Other size particles, both larger and smaller are retain more efficiently than the 99.7% measurement. HEPA filter are widely used in air purifiers and vacuum cleaners especially in critical environments such as laboratories, hospitals and museums.
Properties
- HEPA filters are not washable and must be replace to remain effective
- HEPA filters do not capture gases, smoke, or odors; for these, they must be paired with activated carbon
- HEPA filters force motors to work very hard; thus they should not be placed on equipment not designed for their use
Resources and Citations
- EPA: What is a HEPA filter?
- AIC Conservation Wiki: Cleaning Exhibit Objects on Display
- Heath and Safety Technical Exchange: Lead Sucks-HEPA Saves and A Heap’o HEPA Information. Chris Stravrodis and Batyah Shtrum. Western Association for Art Conservation (WAAC) Newsletter Vol 19, No. 3. September 1997. pages 12-15.
- AIC Conservation Wiki: Filters for Ventilated Cases