In the blocks of complex air purification (BСP) modern air separation plants is used a fiberwise backfill aluminum oxide and synthetic zeolite. The effectiveness of aluminum oxide mainly influences the quality of air entering the separation unit. Reports about the development and production of the air dryer brands «New Sieve ANT-4A» based on zeolite LTA. This product has been tested in the laboratory of JSC «Cryogenmash» and fully meets the high requirements given company to the air dryer for BСP.