Rittal 3241110 TopTherm Filter Fan Unit Brand: Rittal. Part Number: 3241110. Rittal TopTherm Filter Fan Unit, 1-Phase, 115 VAC, 0.52/0.48 A, 40/42 W Power, 54/56 dB Sound Level, 135.4/147.1 cfm Air Flow, Threaded/Surface Mounting, AC Motor, NEMA 3/3R/4/4X/12/IP54/IP55/IP56 Enclosure, 10 in W x 0.98 in D x 10 in H Dimensions. Additional Description: RTL -3241110 (O) FILTER FAN 135CFM 115 V 50-60 HZ. Catalog Description: SK fan and filter units TopTherm, 230/250 m³/h, 115 V, 1PH, 50/60 Hz, WHD: 255 x 255 x 25 mm..