Draft-free air curtain closure

Claim 1

IN CAR WASH BUILDINGS AND LIKE WORK SPACES WHERE OPEN ACCESS FOR VEHICULAR AND OTHER TRAVEL IS DESIRABLE, THE EXCLUSION OF INCLEMENT WEATHER AND DRAFTS THROUGH SAID OPEN ACCESS TO SUCH WORK SPACES IS NECESSARY, AND A RELATIVELY CONTINUOUS EXTRICATION OF WASTE AND WORK PRODUCT AIR FROM THE WORK SPACE IS IMPORTANT TO PERSONAL HEALTH AND SAFETY, THE IMPROVEMENT COMPRISING; AN AIR CURTAIN STRUCTURE RECEIVED AND MOUNTED IN CONTIGUOUS RELATION TO A DOORWAY ACCESS TO A WORK SPACE, SAID AIR CURTAIN STRUCTURE INCLUDING A PLENUM CHAMBER PART EXTENDING OVER AND ACROSS SAID ACCESS AND HAVING DUCTS CONNECTED THERETO AND DISPOSED IN CLOSE FITTED RELATION ALONG ADJACENT SIDES OF SAID ACCESS, A FRESH AIR INTAKE OPENING PROVIDED IN THE OUTER DISPOSED SIDE FACE OF SAID PLENUM CHAMBER PART, DISCHARGE OPENINGS PROVIDED IN SAID DUCTS RELATIVELY ALLIGNED ACROSS SAID ACCESS FOR PROVIDING CURTAIN AIR FROM EACH THEREOF FLOWING TRANSVERSELY ACROSS SAID ACCESS, SAID INTAKE OPENING BEING DISPOSED APART FROM SAID DISCHAWRGE OPENINGS TO PRECLUDE THE RECICULATION OF CURTAIN AIR, MEANS WITHIN SAID PLENUM CHAMBER PART FOR ATMOSPHERICALLY CONDITIONING FRESH AIR RECEIVED THROUGH SAID INTAKE OPENING FOR SUBSEQUENT USE IN SAID WORK SPACE, BLOWER MEANS PROVIDED IN SAID AIR CURTAIN STRUCTURE FOR INDUCTING FRESH AIR THROUGH SAID INTAKE OPENING AND DISTRIBUTING CONDITIONED AIR TO SAID DUCTS IN SUFFICIENT VOLUME FOR DISCHARGE UNDER PRESSURE ACROSS AND IN THE PLANE OF SAID ACCESS PROVIDING AN AIR CURTAIN SEALING SAID ACCESS AND FOR DEFLECTION WITHIN SAID WORK SPACE AT LEAST IN PART THEREBEHIND, SAID BLOWER HAVING SUFFICIENT CAPACITY FOR PROVIDING MAKE-UP AIR IN SAID WORK SPACE MORE THAN COMPENSATING FOR THE EXTRICATION OF WASTE AND OTHER AIR FOR PRESSURIZING SAID WORK SPACE TO BACK-UP SAID AIR CURTAIN AND PRECLUDE DRAFTS AND THE LIKE THERETHROUGH.