Rittal 3243110 TopTherm Filter Fan Unit Brand: Rittal. Part Number: 3243110. Rittal TopTherm Filter Fan Unit, 1-Phase, 115 VAC, 0.78/0.8 A, 75/90 W Power, 59/61 dB Sound Level, 323.7/353.1 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 -3243110 (O) FILTER FAN 353CFM 115V 50-60 HZ. Catalog Description: SK fan and filter units TopTherm, 550/600 m³/h, 115 V, 1PH, 50/60 Hz, WHD: 323 x 323 x 25 mm..