and the rate of passage of fibers through 10a the rate to be employed in any given treatment can easily be determined by pilot trials and by monitoring the ozone concentration at open ends 10b fans 13 are employed to obtain good circulation of the ozone steam mixture within 10a and to ensure good contact between this mixture and the fabric generally the gas flow occurs in the direction depicted in fig2 and 3 the gaseous mixture flows upwardly from the center of the bottom wall of the apparatus past the fabrics or garments under treatment aided by fans 13 when the gaseous current reaches the top wall of 10a the direction changes so that the flow travels along the top wall and downwardly along the side walls baffles 17 help to compartmentalize the gas flow in the embodiment depicted in fig3 auxiliary walls 27 and 28 further aid in compartmentalizing the flow of the ozone steam mixture in this way more efficient ozone utilization is realized usually about 94 95 of the ozone generated is absorbed by the fabric it should be apparent at this point that cross sectional circulation of the ozone steam mixture is desirable and indeed is facilitated by baffles 17 on the.