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add-on control device

An add-on control device is an air pollution control device, such as carbon absorber or incinerator, that reduces the level of pollutants in an exhaust gas.

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add-on control device

An add-on control device is an air pollution control device, such as carbon absorber or incinerator, that reduces the level of pollutants in an exhaust gas.

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The control device usually does not affect the process being controlled and thus is "add-on" technology, as opposed to a scheme to control pollution effected by altering the basic process itself.