IF you search thru the last few weeks of posts for "humidifier" you can see several threads and some pix posted.
Be sure to get a humidifier with a round opening. I use Sunbeam model #699 (www.sunbeamhealth.com/products.asp?id=5. Take out the "spout" and set pvc pipe directly in it. The opening in this model accepts 2" pipe that you can get at home depot. I bought a straight length, elbow and another straight one. (be sure to measure first!).
I rinse it daily with hot water and clean with mild bleach and water solution (rinse well!) weekly to stave off any fungal or bacterial problems. Go to my setup page and you can see other pix. I think skater2337 as the dual setup that runs the whole length of cage top. Calrton runs a smaller pipe thru the hole in the cage and has drilled small holes so that the mist comes out along the length of pipe.
Hope this helps!
lele
Luna's setup
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0.1 veiled - Luna
0.2 felines - Kyndra and Líta
1.0 African Clawed Frog - Skipper
0.5 Mad. Hissers
0.1 Chilean Rose Hair Tarantula (no name yet)
0.1 Goliath Bird-Eater Tarantula - Natasha