Rittal 3243100 TopTherm Filter Fan Unit. Rittal TopTherm Filter Fan Unit, 1-Phase, 230 VAC, 0.39/0.37 A, 70/87 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 -3243100 SK FILTER FAN 353 CFM 230 V, 50/60 HZ. Catalog Description: TopTherm fan-and-filter units, color: RAL 7035, supply includes: Complete unit ready to install, including filter mat, description: Complete fan unit for tool-free mounting on surfaces. Air throughput from 20 - 900 m³/h, standard protection category IP 54..