is created by the flow of the air through the filtration system and by the motion of the vacuum cleaner as it is moved from place to place the turbulence causes the water to move through out the regions of the low chamber 50 this has a cascade effect in that water comes into initial contact with a significant portion of the air and thereby trap the dust in this process the contaminated air is filtered to substantially remove the dust that is entrained in the air clean air that is substantially dust free travels through tube 64 and exits through exit 41 the upper baffles assure that moisture is recovered the depth of the reservoir and the amount of water employed should be sufficient so that the water covers tube inlet 80 even when the exhaust filtration system is tilted at an angle as shown in fig1 to increase the amount of water dispersed or sprayed into region 78 the lower edge of the baffles 52 can be designed to be further from reservoir 54 in addition the upper baffles 60 can be designed to be closer to partition 70 in order to reduce the amount of moisture loss as is apparent additives such as for example disinfectants bactericides and perfumes can be added to the water in the reservoir the exhaust filtration system is particularly useful for vacuuming hospitals and preparing clean rooms for use in fabricating semiconductors fig3 is an embodiment of the exhaust filtration system which is particularly suited for being attached to the exterior of a conventional vacuum cleaner for instance inlet 42 can be connected to an exhaust outlet formed on an air impervious jacket that enshrouds the dirt collecting filter bag the system includes lower chamber 82 and upper.