•ECM - KRYO FORTRESS Fan Pack - Refrigeration •Unit Bearing •Electronically Commutated (ECM) •Thermally Protected •Totally Enclosed Air Over •IP66/67, -40°C to 55°C (-40°F to 131°F) •Ball Bearing •23.5 Leads, with Right-Angle 2-Pin Plug •CFM 355 •9.532 Bolt Circle