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A precipitation resistant ventilator for a structure enclosing an interior space. The ventilator encloses a space that is in communication with the structure interior space. A thin sheet of air permeable water resistant material is disposed within the ventilator interior. The thin sheet of air perme

A precipitation resistant ventilator for a structure enclosing an interior space. The ventilator encloses a space that is in communication with the structure interior space. A thin sheet of air permeable water resistant material is disposed within the ventilator interior. The thin sheet of air permeable water resistant material forms a barrier that excludes the entry of precipitation and other foreign matter into the roof structure while still allowing air exchange.

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A precipitation resistant ventilator for a structure enclosing an interior space. The ventilator encloses a space that is in communication with the structure interior space. A thin sheet of air permeable water resistant material is disposed within the ventilator interior. The thin sheet of air perme

A precipitation resistant ventilator for a structure enclosing an interior space. The ventilator encloses a space that is in communication with the structure interior space. A thin sheet of air permeable water resistant material is disposed within the ventilator interior. The thin sheet of air permeable water resistant material forms a barrier that excludes the entry of precipitation and other foreign matter into the roof structure while still allowing air exchange. oducing a plurality of live objects to a singulator. The singulator isolates the individual live objects and places them in a pallet on a conveyor. The system may detect and remove cadavers from amongst the live objects. The conveyor leads the live objects to a grasper. The grasper positions the legs of the live objects so that a shackler can secure the legs of the live objects with a shackle. The live objects and the shackle are then inverted and passed on to a shackle line. The shackle line may be a kill line buffer or a kill line. uid. 14. A method for planarizing a microelectronic substrate, comprising: positioning the microelectronic substrate proximate to a substrate support with a first surface of the microelectronic substrate facing toward a planarizing surface of a planarizing pad; biasing the microelectronic substrate toward the planarizing surface by directing a flow of liquid toward a second surface of the microelectronic substrate facing generally opposite the first surface; moving at least one of the microelectronic substrate and the planarizing pad relativ