Abstract
This chapter describes many applications in which large quantities of warmed fresh air can be supplied to replace air withdrawn from the space either directly to atmosphere or after passing it through extraction hoods, booths, or gratings. Rooms or booths in which paint spray guns are used have to be supplied with efficient means of air extraction to remove the excess spray mist, to prevent the mist from settling on the article being sprayed, and to obviate discomfort and possible hazard to health of the spray gun operator. In woodworking factories, the waste timber in the form of sawdust or chips is withdrawn from the woodworking mill through a ducted air-wood waste collection system that picks up the waste product close to the tool or machine head and conveys it with the air to a cyclone where the air and wood waste are separated. When dealing with the exhaust of gases or fumes, it is generally necessary to employ canopy hoods placed above the vats, tanks, or cooking equipment at a sufficient height to permit the workpieces to be lifted in and out. As the air extracted via the canopies must be replaced by warmed supply air, the canopy hoods should be designed so as to be effective when handling the minimum volume of exhaust air.
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