High-efficiency particulate air filter
Also found in: Medical.
high-efficiency particulate air filter[‚hī i¦fish·ən·sē pər‚tik·yə·lət ′er ‚fil·tər]
An air filter capable of reducing the concentration of solid particles (0.3 millimeter in diameter or larger) in the airstream by 99.97%. Also known as HEPA filter.
High-efficiency particulate air filter(HEPA)
An air filter that captures a high percentage of all particles, including very small particles not caught by other types of filters.