1:20
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Industrial fan spinning
0:20
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Domestic kitchen fan exhaust, very close
0:50
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Fan winding up and running, lacks definition
0:13
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Vent exhaust from industrial engineering building loop
1:40
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Industrial fan spinning in the distance
0:40
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Mine vent in the distance 1
0:23
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Mine vent in the distance 2
1:02
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Large vent turn on and run then a clunky off 1
0:24
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Large vent bangs and clunks with swells
0:19
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Large vent turn on and run then a clunky off 2