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  1. mike4472

    Ventillation fans in a vacuum - fans are failing - windings fault to earth

    Have you thoght about a motor driven by something other than electricity. My first thoughts are an air driven motor. Obviously some thought would need to be given to venting the waste air cos it probably won't sit too well with your vacuum.
  2. mike4472

    Battery Room Ventilation Fan

    Have you considered a fan with a flameproof motor? Have you checked the number of 'wet' cells against the volume of the room. Can you generate enough hydrogen to exceed the lower explosive limit.
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