3244110 Rittal Filter Fan, 115 V ac, AC Operation, 587m³/h Filtered, 770m³/h Unimpeded. Rittal TopTherm fan and filter units are efficient, easy to assemble and versatile. The TopTherm series requires no tools during assembly, exchange or maintenance. The fan module and power connection are simple to position to suit the needs of the application, a latch on the grille allows for fast filter replacement and the electrical connections are managed with spring clamp terminals.