... 1.air flow 51000m3/h 2.cone fan can save 20% of energy than the simple fan. 3.Galvanized frame, Die- ... cast 1 Reasonable cone designing, low noise, big air flow, strong ventilation, low ... breaking, aesthetic durability.6. There are two types of fan house, slant wall type, upright wall type, could ... Also protection class: IP55, insulation class: F grade. cone fan