It's enough but it doesn't completely solve the issue. I have the BitFenix Pro in the front and what I ended up doing was tearing apart the stock 200mm fan and using it as a shroud that pulled the fan away from the mesh. It sounds a ton better and it wasn't that difficult to do. It took me maybe 15 min total for dis-assembly of the fan and mounting it to the BitFenix with a couple zipties.
It's worth a shot even for a temp solution.
cheers mate and good luck