technical specifications:- particle size: omni-directional air inlet with pm 10 separation through an impactor followed by pm 2.5 separations through a wins impactor sampling rate: constant sampling rate of 1m3/hr unaffected by voltage fluctuation and filter choking maintained by critical orifice system. filter media: filter holder designed to accept any standard 47 mm diameter filter media. Sample volume: dry gas meter records the total air volume sampled. Power requirement: single phase ac 220 volts, 50 hertz supply. Sampler unaffected by +/- 10% fluctuation in supply voltage.