STEGO Filter Fans are designed to provide cooling by forced air circulation in enclosures and cabinets containing electrical and electronic components. The interior temperature of an enclosure can be reduced by channeling cooler, filtered outside air into the enclosure, thus expelling hot inside air. The Filter Fan Plus series encompasses a new air-flap technology on the air outlet side, reaching an unparalleled high degree of airfl ow. A unique ratchet mechanism is used for easy installation, providing safe and secure mounting while guaranteeing a tight seal. The FPI system draws cleaner, cooler air into the enclosure, while the FPO system draws warmer air out. These fans are suitable for indoor use and are UL/NEMA Type 12 rated.