I made it at TechShop
Step 1: Materials and tools
120 MM computer fan ( preferably > 70 CFS air flow and <25 DB noise level)
120 MM fan screen
AC/DC transformer ( if needed, check the specifications for your fan -in the USA, 12v DC and 120v AC fans are common)
Polyethylene DVD stack cover
Polyethylene DVD jewel case
4 6x32 screws (length should be at least 1/4 inch longer than the depth of your fan)
(6 feet) 1 1/4" corrugated plastic drain hose
120x120mm closed cell foam sheet 1/8 " thick (for gasket)
hand rotary tool with small drum sanding bit
Step 2: Construction
2. Cut the jewel case into two pieces at the hinge. Discard one piece, and cut and/or grind a circular hole corresponding to the bore of the fan in the remaining piece
3. Weld the the modified jewel case piece to the base of the DVD cover. I used a soldering iron. Ensure that you have the appropriate respirator and ventilation to safely weld the plastics you are using.
4. Cut/grind four holes for the tubing
5. Drill 4 holes in the jewel case and gasket corresponding to the mounting holes at the corners of the fan.