-Paper Towel (Bounty)
-Hot Glue gun
-Two thick gauge wires
-Neon Sign from walmart (Beer sign) $30
-Xbox Fan <Powerful (or similar)
-12V DC Adapter (Works Excellent. I didn't know my Xbox fan was so powerful)
Take the shoe box and cut two sides out for the "air filter." Cut a third hole out on the top for a fan. Hot glue the fan into place. Take your paper towel and cut it out to the right size to fit into your box. Secure it in place with staples and electrical tape. Take your neon sign case apart. De solder the two copper wires connected to the thin wires. Solder on your thick gauge wires. Put it back together (Make sure you pull through your wires too). Hot glue gun the neon sign casing into the box. Put the lid on. Plug it in and you are set.
Here is the video:
Note: I used this to sterilize my room because my basement leaked and mold grew.
If I were to use this in my grow box, then I would just have it between the carbon filter and the grow room.
Sorry for the poor narration. - The audio that was supposed to come with the video was much better but didn't record.