Originally Posted by aaa12585
Thanks for the heads up!
I'm not familiar with the term when talking about fans and such. At first I thought you meant a make-shift dust filter, but I think you're talking about something like an air duct, correct?
A shroud is a spacer. Ghetto version is a gutted fan housing. Concept is that it eliminates the dead spot immediately in front of the fan motor. There are also built versions. Martin at Skinneelabs
did testing on this. He also does fan testing. I think he has posts here at OCN on this.