Interesting about the noise in the aerosol fan, as I've never heard a thing from them on my twin Z3200s even when the cover's off and I'm watching the fan run. I'm pretty sure they are OEM parts but could be wrong. The hurricane-like sound coming from the PSU fan is something else and I've been wanting to replace those for years. It's quite a surgery, though, and both of those printers are kept very busy every day.