Step 1: What You'll Need
A foot of 3 - inch diameter PVC tubing
A 3 - inch diameter computer fan (mine was 12V)
An AC/DC adapter, with a DC output the same as your fans
Filter for a room air conditioner
Hose clamp for the 3 - inch pipe
I already had the fan and adapter laying around, but everything shouldn't cost more than 20 dollars.
You will need the following tools:
Drill and various bits
Soldering iron + solder
Hot glue gun + sticks
Step 2: Preparation
Next, make one larger hole in between the two smaller ones to accommodate the toggle switch.
Step 3: Assembly Pt. 1
The twist and solder each of the positive wires to the prongs of the toggle switch. (Positive on the adapter has a white stripe)
Step 4: Assembly Pt. 2
Then, place the fan on the top, make sure its centered with the air flow going AWAY from the pipe, and hot glue the corners down. Then, form a nice tight seal around the edges of the fan and pipe.
Step 5: Put on the Filter
Place it on top of the pipe, opposite side of the fan, and secure it with the hose clamp. Tighten as hard as you can, then trim off the excess filter corners.
Step 6: All Done!
This was my first instructable, so if you like, lemme know!