Fan noise sounds like rattling. Intermittent

HI everyone, my iMac starting making what sounds like a rattle coming from the fan, I do not know which, but if you face the iMac it sounds like its on the left hand side. if you are playing a game or have multiple windows open and move the mouse or trackpad to move the window up and down the rattle gets louder. If you leave the window alone the sound fades to nothing. It's been sent off once to a company called opal, approved fixers. This was sent back to me after 2 wks with no fault found. Now it's doing the noise again. If I play any game via steam it comes back. I describe the noise as a bit of paper banging into a desk fan.
Any info would help, first time posting. Windows convert.

Welcome to the iMac Users Forum. It sounds like there could be something touching but the fans get louder at higher speeds. Here is a Widget that you can use to monitor fan spped, internal temps and a lot of other things:
http://islayer.com/apps/istatpro/
If you had it worked on during warranty Apple may cover you as it wasn't fixed the first time around. It would be worth asking (not here) apple repairs support.

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