Rittal Corporation’s new generation of TopTherm filter fan units are designed to allow for the complete installation, maintenance and configuration without tools. Rittal filter fans utilize the standard foam-in-place gasket so they easily maintain the UL Type 12 or IP 54 integrity of an enclosure without the additional use of screws. The new filter fan line is easily upgraded to IP 55 through the additional use of fine filter mats. And, newly designed rainproof shrouds provide an easy upgrade to a UL Type 3R/4(X) or IP 56 rating.