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A three column cryogenic rectification system for producing at least one of oxygen and nitrogen employing a medium pressure column which is operating at a pressure between the operating pressures of the higher and lower pressure columns, and which receives an air feed which is at a lower pressure th

A three column cryogenic rectification system for producing at least one of oxygen and nitrogen employing a medium pressure column which is operating at a pressure between the operating pressures of the higher and lower pressure columns, and which receives an air feed which is at a lower pressure than the air feed to the higher pressure column. The medium pressure column processes oxygen-enriched liquid from the higher pressure column and is reboiled by a fluid taken from below the top of the higher pressure column.

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A three column cryogenic rectification system for producing at least one of oxygen and nitrogen employing a medium pressure column which is operating at a pressure between the operating pressures of the higher and lower pressure columns, and which receives an air feed which is at a lower pressure th

A three column cryogenic rectification system for producing at least one of oxygen and nitrogen employing a medium pressure column which is operating at a pressure between the operating pressures of the higher and lower pressure columns, and which receives an air feed which is at a lower pressure than the air feed to the higher pressure column. The medium pressure column processes oxygen-enriched liquid from the higher pressure column and is reboiled by a fluid taken from below the top of the higher pressure column. mmunicate with the outside of said casing (11) is formed in said casing (11), wherein an air suction opening (38) is formed in said casing (11), thereby allowing said utilization side air passageway (35) to communicate with the inside of said room through a duct (17) connected to said air suction opening (38); and wherein a baffle plate (41) is positioned in said air suction opening (38) so that refrigerant leaking from said refrigerant circuit (20) into said utilization side air passageway (35) is prevented from flowing into the inside 25 of said room. 5. An air-conditioning apparatus comprising an outdoor casing (11) for housing a refrigerant circuit (20) charged with refrigerant, wherein a utilization side air passageway (35) in which a utilization side heat exchanger (24) for said refrigerant circuit (20) is disposed and a heat source side air passageway (31) in which a heat source side heat exchanger (22) for said refrigerant circuit (20) is disposed are formed in said casing (11), said passageways (35) and (31) being in communication with the inside and the outside of a room, respectively, wherein an opening portion (40) allowing said utilization side air passageway (35) to communicate with the outside of said casing (11) is formed in said casing (11), wherein said refrigerant of said refrigerant circuit (20) comprises a substance whose atmospheric specific gravity is greater than that of air; wherein said utilization side air passageway (35) communicates with the inside of said room through a duct (17) connected to a bottom portion of said casing (11); and wherein said duct (17) is connected to said casing (11) so that one end of said duct (17) projects into said utilization side air passageway (35). 6. An air-conditioning apparatus comprising an outdoor casing (11) for housing a refrigerant circuit (20) charged with refrigerant, wherein a utilization side air passageway (35) in which a utilization side heat exchanger (24) for said refrigerant circuit (20) is disposed and a heat source side air passageway (31) in which a heat source side heat exchanger (22) for said refrigerant circuit (20) is disposed are formed in said casing (11), said passageways (35) and (31) being in communication with the inside and the outside of a room, respectively, wherein an opening portion (40) allowing said utilization side air passageway (35) to communicate with the outside of said casing (11) is formed in said casing (11), wherein said utilization side air passageway (35) in which utilization side blower means (12) is disposed is zoned into an upstream passageway (36) on the upstream side of said utilization side blower means (12) and a downstream passageway (37) on the downstream side of said utilization side blower means (12); wherein said refrigerant circuit (20) is so arranged in said upstream passageway (36) and in said heat source side air passageway (31) as to detour said downstream passageway (37); and wherein said opening portion (40) is formed so as to allow said upstream passageway (36) of said utilization side air passageway (35) to communicate with the outside of said casing (11). 7. An air-conditioning apparatus comprising an outdoor casing (11) for housing a refrigerant circuit (20) charged with flammable refrigerant, wherein a utilization side air passageway (35) in which a utilization side heat exchanger (24) for said refrigerant circuit (20) is disposed and a heat source side air passageway (31) in which a heat source side heat exchanger (22) for said refrigerant circuit (20) is disposed are formed in said casing (11), said passageways (35) and (31) being in communication with the inside and the outside of a room, respectively; wherein said air-conditioning apparatus further comprises: heat source side blower means (13) disposed in said heat source side air passageway (31); detection means for detecting the presence or absence of a refrigerant leak from said refrigerant circuit (20); switch