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The filter housing determines the maximum allowable flowrate for a filter. HYDAC defines these values in our housing pressure loss curves, located on the last page of every filter tech data sheet (also referred to as the sales brochure). Flowrate should never be used as the sole deciding factor in filter selection. The clean element pressure drop should be calculated for both the operating temperature and for cold start conditions. These pressure drop calculations determine filter selection. Refer to # 12 below for additional details.