Compare Centrifugal Extraction Dust Read more Remove Code Speed (RPM) Air Flow (CMH) Power (Watt) ST Press (PA) PH (Volt) SIS21/CF-C646-4C/3/4 1665 1608-3918 3000 892-745 380 SIS21/CF-C646-5C/5.5/4 1400 3054-7450 5500 1401-1156 380 SIS21/CF-C646-4C/7.5/4 1350 8022-10740 7500 1343-1156 380