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Any contactor specialists out there?

I have multiple machines that are connected via extraction ducting to a 2KVA 3 phase extraction fan on the external wall.

At the moment I rely on machine operators to switch the extraction fan on before using any of the machines (not all machines are used at the same time). Trouble is they forget sometimes and this causes problems.

I am thinking there ought to be a contactor out there to which you can just add additional input modules, so if I wire back a 230V signal from each machine to an input to the contactor from each of the machines, then if any machine is switched on the contactor will make to switch on the fan.
Then all I need is one last function to delay the off by say 30 minutes after the last machine has been switched off.

I know there is other ways of doing this, but wanted to explore what could be the simplest route if there is such a modular contactor.
 
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