Re: UPS in a wooden cupboard
I appreciate that this is not actually answering the question, but might it be worth re-locating the UPS to someplace where the noise will not be nuisance ?
I put mine in the bathroom, in a cupboard with a mesh door. The continual slight heat output avoids any risk of the plumbing freezing in severe weather.
Be aware that even a slight increase in temperature significantly reduces the life of the batteries.
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