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Free passage
The dimension of the free passage usually refers to the largest spherical object that may pass through the impeller.
Free release fire pump
Free release fire pumps are standard pumps used as fire pumps. These standard pumps are not made for fire pump application, which can cause poor functionality in a sprinkler-pump application due to risk of clogging and instabilities in System pressure.
Frequency converter
A frequency converter is an electric device that converts a current with one frequency to a current with another frequency.