AIR FILTRATION SYSTEMS

摘要

An air filtration system is described for removing oil and grease entrained in air extracted from the region above a cooker. The system comprises a first mesh screen filter leading to a first chamber, in which two nozzles (10) create two separate continuous water curtains (15a, 15b) which overlap when viewed in the direction of the air flow to form a combined curtain which extends across the region through which the air passes. The extracted air then passes via a second mesh screen filter (11) into a second chamber (12), which is identical to the first chamber (9), and in which two further nozzles (13) are provided which create two further water curtains (15c, 15d). The water curtains (15a, 15b, 15c, 15d) cool and condense vaporised oil and grease within the air, and the condensed oil and grease droplets fall with the water into a container. The main bore of each nozzle is of circular cross-section, but a profiled plate causes the resulting water curtain to have a width which is narrow relative to the diameter of the nozzle bore. The water contains dissolved ozone and can also be "grey water".