TY - GEN AU - Carl W Coblentz AU - Paul R Achenbach C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1959-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.6404 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1959 TI - Performance tests of four cleanable impingement air filters types 44 (two thicknesses), FS 304 and FS 504 ::manufactured by The Farr Company Los Angeles, California ER -