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Another fan isn't really an option as it is in a very awkward place to get to and I would like it to automatically turn back on again as the people in the office won't turn it back on again...

Hi There,  I have a 240v extractor fan in an office building which needs to be on most of the time and is quite noisy. However if an important call is being made it needs to be able to be turned off temporarily for a set time, some where between 5 and 30 minutes. Any idea what type of switch I...