Rittal 3238110 TopTherm Filter Fan Unit Brand: Rittal. Part Number: 3238110. Rittal TopTherm Filter Fan Unit, 1-Phase, 115 VAC, 0.24/0.22 A, 19/18 W Power, 46/49 dB Sound Level, 32.4/38.8 cfm Air Flow, Threaded/Surface Mounting, AC Motor, NEMA 3/3R/4/4X/12/IP54/IP56 Enclosure, 5.8 in W x 0.63 in D x 5.8 in H Dimensions. Additional Description: RTL -3238110 (O) FILTER FAN 39CFM 115 V 50/60 HZ. Catalog Description: SK fan and filter units TopTherm, 55/66 m³/h, 115 V, 1PH, 50/60 Hz, WHD: 148.5 x 148.5 x 16 mm..