A substantially closed loop filtration and convection system is configured to move fluid/oil volume within a fryer vat. The vat has a flow directed inlet, which directs flow of cooking fluid in a direction across the bottom of the vat directing the flow of oil and crumbs/debris across the vat, up and across a flow separation portion toward and into a cleaning zone portion of the vat. A crumb tray or crumb/debris catch system is disposed in the cleaning zone adjacent to the vat.