By particle size, filters pollutants, using diameter 47 mm 3 and install it into the tunnel through the exhaust sample dilution dilution (Dilution Tunnel) vault, for example, is made of material that does not rust.
The filter pollutants, particle size to 47 mm in diameter and fitted with a set of three tunnels through the diluted exhaust dilution (Dilution Tunnel) sampling unit made from a material that will not rust.
The size of filter pollutants particle diameter were used 47 mm 3 series and installed into the sample dilution tunnel exhaust through the dilution. (Dilution Tunnel) series samples made from materials that do not rust.