Smell from iMac 21.5 (2017) rear vent

I bought an iMac 21.5 (2017) (since it was the only available Mac in the store). I haven’t actually used it that much ever since I bought since online classes was pushed next month. I just updated to Big Sur , install Zoom, Chrome, Skype and MS Office, sync my email and did little browsing. I use it 2x a week max or not at all. First day of using it, iMac did emit a faint smell. I thought it was normal since it was my first time to use it. As I continue using it, I notice that the smell is getting stronger. Though I can only smell it if I get too close to the unit. I actually tried sniffing my Mac (LOL) and found out that it is coming from the rear vent. I’m trying to book for a repair but the nearest service center is packed. I just want to know if anyone had a similar experience. (I know Mac M1 is already out but I needed a computer asap because of online school also M1s were not locally available and the only Mac available was this one. )