Home made fan shroud.

The shroud is 1/2 inch off the fins, sealed on the top, bottom and side tanks. I can feel it pulling air from the right hand side .
I agree w/ rrr . I just finished reworking a single 16" shroud for two 14" fans. I painted it black to make it look better ! I used an alum. spoolgun to weld it, hard to make look good on that thin a metal. Got to finish wiring all 3 fans today . (two pullers/1 pusher)