Vortex stabilisation for fan

This is a early design of a vortex stabilisation for fan.

If you stack 2 fans they will not gain 2 times the movement of air, this is because the air from the first fan makes vortex streams. The second fan have to fight those first then move them true the fan blades, this negate the second fan making it not efficient.

By having a space between the fans and straightening the air the air can be moved more easy and this improves the stacking of fans to a degree.

This is made to be used inside of a old or broken fan case. I had 2 fans that failed and that's why i made this.

The dual fan fins worked better for increase of pressure but i keep the original if someone want that one.