Slim Line Filterfans 4.0 from Pfannenberg deliver high-efficiency thermal management for industrial enclosures, offering airflow rates up to 427 CFM. Engineered with flow-optimized fins and rotor blades, these units achieve superior air circulation. A patented, four-corner click mechanism enables tool-free, rapid installation and quick filter replacement. Their fluted filter mat's folded design extends filter lifespan by up to 300% over traditional materials. Rated IP55/NEMA Type 12, Filterfans protect against dust and moisture, meeting UL/cUL (NITW2) and CE standards.