Orifice-defining entry plate for filtration device

A filter unit for use with a filtrating fluid flow system, the filter unit configured to receive a flow of a fluid containing particulate matter, the filter unit defining a fluid flow zone, the filter unit including a filter unit entrance for the fluid at a first end of the fluid flow zone, the filter unit comprising:

• a filter structure comprising a fluid-permeable filter material configured to at least partially filter the particulate matter from the flow of fluid;
• and
• an entry plate formed of a nonporous material, the entry plate located proximate the filter unit entrance and mounted upstream from the filter structure relative to the flow of fluid with at least a portion of an outer edge of the entry plate engaged against and positioned within the filter unit entrance, the entry plate and the filter structure together defining a fluid cavity within the filter structure, the entry plate having one or more acutely angled faces sloping inwardly into the fluid cavity and extending into the fluid cavity terminating at an orifice defined therein through which the flow of fluid is configured to be constricted and to pass into the fluid cavity and toward the filter structure, a portion of the fluid-permeable filter material of the filter structure being aligned relative to the orifice to intercept the flow of fluid after the fluid has passed through the entry plate, the filter structure and the entry plate configured such that all the fluid flow passing through the entry plate impacts upon the filter structure.