AstroCel I HEPA filters are used primarily in “cleanrooms” and “clean benches,” areas which require the very highest levels of contamination control. The filter consists of water-proofed, fire-retardant fiberglass media formed into a series of pleats. Corrugated sheets of aluminum separate the pleats to permit maximum usage at minimum resistance. The media is enclosed in and foam bonded to a filter frame made of 3⁄4" fire retardant particle board. Gasketing is available on the upstream, downstream or both faces.

“H”-level filters are scan tested at 99.99% efficiency to insure the filter is free from pin hole leaks. Factory scanning detects these leaks which are repaired before the filter is released for shipment. AAF uses a proprietary static scan test with a challenge aerosol of non-toxic, polyfunctional alcohol . For pharmaceutical and those applications requiring PAO, AAF offers scanning with this material using a light scattering photometer.

An economical, non fire retardant model of the AstroCel I with particle board sides is available in limited sizes.