Rittal TopTherm Fan and Filter Units 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. TopTherm units feature efficient technology that enables greater pressure stability and more constant air flows.Stock No: 756-9935 is a temperature indicator. Features and Benefits:€ Flexible assembly options€ Minimum installation depth€ Even air distribution