title: Air filters for germ-free isolators.
abstract: A germ-free isolator must have a perfect bacterial filter. This paper describes a new, relatively inexpensive, stainless-steel filter frame, which is easily and quickly assembled and protects the enclosed filter material at all times. Resistance to the flow of air was less than 4 inches of water at an airflow of 30 ft(3)/min through the filter frame with 204 inches(2) of surface area and four, one-half inch thick pieces of fiberglass filter material. This filter performed satisfactorily in our gnotobiotic laboratory and was found to be consistently 100% efficient in removing an aerosol containing Serratia marcescens from an air stream under a variety of operating conditions.
mesh_terms: D000391:Air Microbiology / Q000295:instrumentation; D005374:Filtration; D005856:Germ-Free Life; D005898:Glass; D012706:Serratia marcescens