Machine I.D. (mm) ꞉ 28.5, 29.5, 30.0, 30.5 Machine O.D. (mm) ꞉ 30.0, 31.5, 32.0, 32.5 Patient I.D. (mm) ꞉ 25.5 Patient O.D. (mm) ꞉ 29.5 Resistance (PA)꞉ 15 at 30L/min Bacterial filtration efficiency*(%)꞉ 99.999