Rittal 3244110 TopTherm Filter Fan Unit Brand: Rittal. Part Number: 3244110. Rittal TopTherm Filter Fan Unit, 1-Phase, 115 VAC, 0.9/1.25 A, 100/145 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 -3244110 (O) FILTER FAN 424CFM 115 V 50-60 HZ. Catalog Description: SK fan and filter units TopTherm, 700/770 m³/h, 115 V, 1PH, 50/60 Hz, WHD: 323 x 323 x 25 mm..