Patent ID: 8858889

Claim:
A contaminate control device comprising: a housing having an inlet and an outlet, the housing having an axis; an axial flow filter fluidly disposed coaxially within the housing and coupled between the first inlet and the first outlet, the axial flow filter having an inlet and an outlet, wherein the axial flow filter is configured to flow a first gas portion through a first filter media in an axial direction parallel to the axis and directly between the inlet of the housing and the outlet of the housing; a radial flow filter disposed circumferentially about the axial flow filter and fluidly coupled between the inlet of the housing and the outlet of the housing, the radial flow filter having an inlet on an inner diameter and an outlet disposed on an outer diameter, wherein the radial flow filter is configured to flow a second gas portion through a second filter media in a radial direction directly between the inlet of the radial flow filter and the outlet of the radial flow filter while the first gas portion is flowing through the axial flow filter; and, a flow restrictor fluidly coupled between the inlet of the axial flow filter and the inlet of the housing; wherein the flow restrictor is sized to provide a first pressure drop between the flow restrictor and the inlet of the axial flow filter that is substantially equal to a second pressure drop between the inlet of the radial flow filter and the outlet of the radial flow filter for a predetermined flow rate through the axial flow filter and radial flow filter.