Here is a video of a high performance elevator fan, which uses a 6-blade propeller, instead of a blower wheel, which I think is quieter and less annoying sounding than the turbine fan. Posted in response to DieselDucy's video with me laughing over the loud fan.

Link to Fan site-[ Ссылка ] Link to Replacement Propellers-[ Ссылка ]
Link to elevator fan video with uproarious laughter-[ Ссылка ]

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