Old bathroom extractor fan starts, accelerates the blades' rotation, steadies into an irregular whirring, constantly speeding up and slowing down as the impeller and the vanes make various noises. Switched off it spins down to a stop. Close prospective. Industrial, Air ventilators
Description: Old bathroom extractor fan starts, accelerates the blades' rotation, steadies into an irregular whirring, constantly speeding up and slowing down as the impeller and the vanes make various noises. Switched off it spins down to a stop. Close prospective.
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