Comment by ssl-3

Birds? Yeah, perhaps. We didn't have any trouble with false alarms that I recall at one shop I worked at with a (relatively small, alarmed) warehouse space where the overhead door was usually open during warm days. I can see it happening, but the false alarms would happen regardless of the intensity of interior alarms.

And the system should not be armed when desirable people are inside, so that problem seems like it is for the birds.

When employees forget their codes and trip the alarm when they're the first ones into the shop at whatever time, they can just go outside to escape the hellish indoor torment. Not perfect, but not so bad either when the goal is to keep people out. :)

Perhaps the smoke should have a harder trigger than the noise, though, if for no other reason than it's a consumable that eventually needs to be fed more money every time it is activated.