TY - RPRT TI - Air delivery and arrestance tests of a "Puritron" air cleaner, model F-20 : manufactured by Michael Electric Company New Haven, Connecticut AU - Coblentz, Carl W AU - Achenbach, Paul R PY - 1960 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 6673 DO - 10.6028/NBS.RPT.6673 ER -