Compare Centrifugal Blower Siroco Read more Remove Code Speed (RPM) Air Flow (CMH) Power (Watt) ST Press (PA) PH (Volt) SIS-21/SCF-2.5# 2800 758-2617 2 1542-1269 380 SIS-21/SCF-3# 1400 2033-3500 1.5 800-175 380 SIS-21/SCF-4# 2800 4000-6500 4 1300-980 380