We are going to be putting in a new Fire Alarm system which will include Mass Notification messaging. Does anyone know of a good technical forum on this subject, NFPA 72?

Have you tried mircom's website there is big section on mass-notification or wikipedia emergency communications systems? Do you have any specific questions? if you fill in the contact forms on mircom's website they will also give you free design support based on their products. there is also a posted case-study on mass notification + fire alarm system installed at Fort Hood Military Base in Texas.

Try contacting a professional fire alarm installing person to discuss all things fire-related and emergencies of all kinds. It's very important because it affects Home security. In this case, improving our knowledge about fire prevention is very important So finding a good technique is very important. https://www.cspalarms.ca/