That sounds terrible, and likely unacceptable. These things will require you keep a paper trail of back and forward emails and details of conversations etc. Your complex has a property manager (usually who ever arranges your AGMs) that you should speak to on this, and get him to help you. The committee should have first been approached by the owner for permission to make the renovation changes, and they should have checked that it was likely ok to proceed – or not. They should now be the ones who take on this battle for you and for the sake of the building. If they don’t or wont’ you need to go to your State authority for the steps to have someone independent understand it and compare what’s happened with what the law allows. If the owner has acted without approval the authority may require them to remove the offending fan at their own cost. That is not your problem as it seems like they should have asked first and not created this problem for all involved. Good luck with it all.