Yes, I know this is a Lock Picking Web Site, but from what know of it, a lot of professionals hang out here also. In light of that, I thought I would offer to share some information on changes to NFPA 80 '07 - Fire Doors. Basically there is now an annual inspection requirement and a field recertification ability/process if you have modified a door in the field.
If there is interest, we can discuss it... If not, we'll drop it... If there is very little interest, PM me and I'll let you know what's going on...
Stay safe and open those locks for fun and profit!
Dave