Equipment for Onions and Potatoes “Klima” Axial fans. “Klima” Axial fans. Number of fan blades variable. Number of blades depending on back pressure. Beside blades, diameter is also important for air and pressure. Plan of cel with fans on 80% capacity. Fans setup page. Fan status: off – stand-by – on – alarm/failure. Vertical air circulation. Horizontal air circulation. Easy to move. Intensive circulation along bags and through bins and crates.