The Cyclone 21 avionic cooling fan is designed to keep aircraft instruments cool while flying. This three-port avionic fan is FAA PMA approved and tested under RTCA DO160D which makes it well suited for aircraft, rotorcraft, and military applications. The Cyclone 21 features high performance ball bearings, a balanced communicator, lock-rotor protections, silicone and conformal coatings. This avionics cooler is designed for operation in harsh environments on experimental, sport, general aviation, rotorcraft, business & commercial aircraft, as well as mobile, marine and military vehicles. This Cyclone 21 avionic cooler (EDMO# CRB122253) has a 28 VDC operating voltage and a 2-wire wiring option.