For over 60 years Pfannenberg has been protecting electrical enclosures from heat damage and ingress of liquid and solid objects. For indoor applications, Filterfan® protects against water and dust (NEMA 12/IP55). For extreme applications (NEMA 4/4X) the addition of a rainhood provides weatherproof protection. Hammond Manufacturing now offers the Pfannenberg Outdoor Rated Filterfan® (NEMA 3R) designed for outdoor weather where resistance against falling rain, ice formation and UV degradation is important to ensure operation of apparatus inside enclosure.