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From the complexities of the centrifugal filter, the Handbook moves on to one of the simplest forms of filter, used mainly for dust removal from air, in ventilating situations. These are the pad or panel filters, consisting of thick sheets of filter
medium, or thinner materials folded to occupy the same space as a pad, contained in a rectangular frame and intended to fit tightly in a corresponding rectangular hole in a dividing wall. They are made in vast numbers, to standard dimensions (usually delineated in inches rather than metric dimensions), and intended to be used once and then discarded – or at most discarded after only a few use/clean cycles.
The purposes of dust filtration include:
● making or keeping a working or living space healthy to occupy and/or work in
● prevention of environmental air pollution, by capturing contaminant particles as they leave a manufacturing process, furnace or machine
● proper maintenance of machinery by preventing the ingress of dust particles that would damage the workings
● improvement of product quality, as in prevention of dust deposition on photographic film or semiconductor surfaces
● recovery of valuable dusts from a manufacturing process, that would otherwise
represent economic loss
● bulk recovery of solids transported by air as in a pneumatic transport process
● protection of workers from hazardous dusts at or near their point of generation.
The proper management of dust collection follows a basic rule of any pollution control technology, namely that it is best to deal with a dust suspension as near to its source as possible, rather than after it has been diluted with gas from other
sources. Thus, fume from a smelter should be treated in hoods immediately over the smelter, rather than in the general exhaust from the smelter building.