The SAFE 128 is an axial fan that is designed to attach directly to an avionics unit's cooling port. Providing a nominal 20 CFM (no load) of cooling air. The SAFE 128 provides an alert output whenever the fan RPM drops below a preset level. SANDIA Aerospace cooling fans use high quality, brushless blower motors and or RunQuiet technology. The SAFE128 unit is FAA PMA and have passed stringent environmental testing to ensure years of reliable service.