Depending on the type of dust, and the method of fire and explosion protection, extraction can be by either a dust colleciton or wet separation system.
The type of extraction used should be determined by whether the purified air will be recirculated back into the plant, or vented outdoors. Wet separators involve lower initial investment costs, whereas dust collectors provide advantageous lower operating costs.
Fire and explosion protection methods are required if the dust is combustible or explosive.
Additional secondary filters must be installed when processing stainless steel because of the carcinogenic qualities of the dust.