Plenum chamber for discharging gas jets against strip material

Claim 1

A GAS DISCHARGE UNIT FOR DISCHARGING JETS OF GAS AGAINST AND GENERALLY ACROSS THE PATH OF MOVEMENT OF AN ADJACENT MOVING STRIP OF MATERIAL COMPRISING. (A) A PLENUM CHAMBER HAVING AT LEAST A PORTION THEREOF HAVING A DISCHARGE WALL WITH A PLURALITY OF ORIFICES IN SAID WALL. (B) SAID CHAMBER ADAPTED TO BE POSITIONED WITH SAID DISCHARGE WALL EXTENDING GENERALLY ACROSS THE PATH OF MOVEMENT OF THE STRIP MATERIAL TO BE TREATED AND WITH A PAIR OF WALLS, ADJOINING SAID DISCHARGE WALL, EACH WALL FORMED WITH AN INLET OPENING TO PROVIDE FOR INGRESS OF AIR TO SAID PLENUM CHAMBER; (C) AN INNER AND AN OUTER COMPARTMENT MEANS WITHIN SAID PLENUM CHAMBER, SAID INLET OPENINGS COMMUNICATING WITH SAID OUTER COMPARTMENT MEANS; (D) A DUCT INSERT HAVING AN IMPERFORATE WALL; (E) SAID INSERT BEING POSITIONED WITHIN SAID INNER COMPARTMENT WITH SAID IMPERFORATE WALL GENERALLY PARALLEL TO SAID DISCHARGE WALL AND SPACED FROM SAID DISCHARGE WALL; SAID DISCHARGE WALL FORMING A WALL OF SAID INNER COMPARTMENT; (F) A GAS INGRESS MEANS IN SAID INSERT FOR THE ADMISSION OF GAS UNDER PRESSURE; AND (G) AT LEAST ONE SINDOW IN SAID INSERT AT A POINT INTERMEDIATE SAID DISCHARGE WALL AND POSITIONED SYMMATRICALY WITH RESPECT TO THE TRANSVERSE CENTERLINE OF THE ORIFICES IN SAID DISCHARGE WALL WHEREBY GAS DISCHARGE FLOW FROM SAID WINDOW INTO SAID CHAMBER IS CONSTRAINED TO DISCHARGE GENERALY SYMMETRICALLY THROUGH SAID ORIFICES OF SAID DISCHARGE WALL.