Multiple bath room switches.

[Smart $]

I have never seen an rtu shut down with a duct smoke maybe if the system was addressible there was a relay in the rtu seeing the duct smoke would require a slc loop. This set up is not addressible and the fire panel is hundreds of feet away. Just looking for an altenative than running back too it.

As I said my FAS experience is limited.

I started a new thread on the subject in your behalf....

http://forums.mikeholt.com/showthread.php?t=149836