I am building a UV light box according to the specs on http://www.eepjon.com/ubldit.htm

There they mention the need for a fan while on http://unblinkingeye.com/Articles/UVBox/uvbox.html Ed shows a box without a fan.

Do you have a fan in your box and if so, where did you get it? I'm trying to find one locally as I already have ALL of the other materials here. I just don't want to cut the plywood without knowing the size of the fan before I begin.