got the borrowed vivosun up and running - it does already rattle, but must ask owner. i've put it on for 5 minutes every hour, so it's a small inconvenience.
not so annoying when i'm at work during the day.
still keen for a quieter fan - but this will be a temporary stop-gap measure, until i get my replacement back.
Save up some money and get one of those pc fans bro..they make little to no noise, or you can extract one from a pc..but i wouldn't recommend it with one that your using..Hope this helps!
Depending on your ventilation system, a PC fan is most likely not going to cut it. If you have ducting, a filter, or a grow space much larger than a computer.
PC fans are good for moving air around d inside your room, but not at exhausting, unless you have no ducting, no filter and a small small grow room. Even then you're gonna need more than one, and will have light leaks coming out of your ass.