Quick question about something in my room?

Hi, I live in an apartment complex and my bedroom is right next to a utilities/maintenance closet...the vent right next to that wall runs 24/7 and is SO loud and annoying. I can't even tell what the noise is but I had a maintenance man come in and he basically said I just have to deal with it or find a way to make it to where I cannot hear it. So, I was wondering if I could put duct tape over it to see if that would cover the noise. I ask because I don't know if this could start a fire or pose any other problems. Also, any other ideas would be welcome. Thanks for your input!