TY - RPRT TI - Performance test at 2000 cfm of model HP-2A dry type replaceable filter : manufactured by Farr Company Los Angeles, California AU - Hunt, Charles M PY - 1967 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 9474 DO - 10.6028/NBS.RPT.9474 ER -