Rittal 3244140 TopTherm Filter Fan Unit Brand: Rittal. Part Number: 3244140. Rittal TopTherm Filter Fan Unit, 3-Phase, 400/460 VAC, 0.17/0.21 A, 93/140 W Power, 65/66 dB Sound Level, 412/453.2 cfm Air Flow, Threaded/Surface Mounting, AC Motor, NEMA 3/3R/4/4X/12/IP54/IP55/IP56 Enclosure, 13 in W x 0.98 in D x 13 in H Dimensions. Additional Description: RTL -3244140 (O) SK FILTER FAN 424 CFM 400 V 3~ 50 HZ AND 460 V 3~ 60 HZ 400/460V. Catalog Description: SK fan and filter units TopTherm, 700/770 m³/h, 400/460 V, 3PH, 50/60 Hz, WHD: 323 x 323 x 25 mm..