Cabinet for mounting, enclosing and cooling electrical apparatus

Claim 1

IN A STRUCTURE FOR MOUNTING, ENCLOSING AND COOLING ELECTRICAL APPARATUS HAVING DIFFERENT TEMPERATURE CAPABILITY LIMITS, THE COMBINATION COMPRISING: (A) A HOUSING INCLUDING AN UPPER PORTION HAVING AN AIR INTAKE OPENING THEREIN AND A LOWER PORTION HAVING AN EXHAUST OPENING THEREIN, SAID INTAKE OPENING BEING OF GREATER THAN SAID EXHAUST OPENING; (B) A VERTICAL TRANSVERSE PARTITION WALL MEMBER EXTENDING WITHIN SAID HOUSING AND VERTICALLY DIVIDING SAID HOUSING INTO FIRST AND SECOND COMPARTMENTS, SAID VERTICAL TRANSVERSE PARTITION WALL MEMBER HAVING AN OPENING THERETHROUGH PROVIDING A RESTRICTED AIR FLOW COMMUNICATION PASSAGE BETWEEN SAID FIRST AND SECOND COMPARTMENTS; (C) MEANS FOR MOUNTING AND INCLUDING ELECTRICAL APPARATUS WITHIN SAID HOUSING IN THE ORDER OR INCREASING TEMPERATURE CAPABILITY LIMIT SO THAT THE ELECTRICAL APPARATUS HAVING THE LOWER TEMPERATURE CAPABILITY LIMIT IS DISPOSED AT THE TOP OF SAID FIRST COMPARTMENT AND THE ELECTRICAL APPARATUS HAVING THE HIGHEST TEMPERATURE CAPABILITY LIMIT IS DISPOSED AT THE BOTTOM OF SAID SECOND COMPARTMENT; (D) MEANS AT THE UPPER PORTION OF SAID HOUSING PROVIDING A FIRST PLENUM CHAMBER HAVING A RESTRICTED OPENING THEREIN IN DIRECT AIR FLOW COMMUNICATION WITH SAID FIRST COMPARTMENT; AND (E) MEANS FOR ESTABLISHING A FLOW OF AIR TO SAID PLENUM CHAMBER OPERATIVE TO PRESSURIZE SAID CHAMBER AND ESTABLISH A SEIRES AIR FLOW PATH WITHIN SAID HOUSING FROM THE TOP OF THE BOTTOM OF SAID FIRST COMPARTMENT AND THROUGH THE RESTRICTED AIR FLOW PASSAGE IN SAID VERTICAL TRANSVERSE PARTITION WALL MEMBER INTO SAID SECOND COMPARTMENT.