Abstract
Air filtration in a laminar air flow hospital room (LAFR) reduced the quantity of electrostatically precipitated dust to 20.8% of that in prefiltered air and to 24.7% of the amount present in a normal room. Eight metals were found in the LAFR dust whereas prefiltered and normal room dust had 10 and 13 respectively. NaCl was the only crystalline compound identified in the LAFR air whereas SiO2 and CaSO4 • 2H2O were in all other samples analyzed. No viruses or microorganisms were isolated from the LAFR dust.