Fan timer suggestions

I need a timer for a fan to recirc air in my rat room.. I want a timer that cam be set to turn on for 10 min or so at a time every 4 hours or so. Any ideas

I have a couple of these running in my room

They have 15 minute intervals

Works great

http://www.homedepot.com/webapp/wcs/...cStoreNum=3026

I use these for my ACs in the summer :)
http://www.homedepot.com/webapp/wcs/...84&R=100685884