Thermally protected. UL recognized. CSA or ULc certified. Centrifugal blower with sleeve bearing. CFM at Static Pressure as follows: 180/144/112 at 0.1", 170/140/109 at 0.2", 165/134/106 at 0.3", 165/130/100 at 0.4", 150/122/90 at 0.5", 140/117/76 at 0.6", 130/87/58 at 0.7", 110/72 at 0.8" and 90 at 0.9". 60Hz Frequency. 1360/1100/830rpm at free air. 115 Volt. 3 Speed. 1.95 amps at free air. Nameplate CFM: 180.