Chore-Time Brock International's Endura fans feature a long, glass fiber composite shroud and HYFLO shutters with a cable attachment that allows HYFLO doors to float left or right together. The 3-phase, 60-hertz version of the fan produces 26,900 CFM and 23.3 CFM/Watt performance at a static pressure of 0.10 inches of water column. The 3-phase, 50-hertz version generates 26,500 CFM and 22.9 CFM/Watt.
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