Very Early Smoke Detector
I think the unit you might be refering to is a VESDA unit. Essentially a very sensitive smoke detector. From the little I know about them, I don't know how effective they are in larger areas with substantial air flow. They are often fitted in prison cells or police station cells as the air flow is not great and you don't want fires in those sort of places.
Pretty sure that they don't come cheap though and they have to be calibrated annually and monitored by means of a fire panel. They aren't the sort of thing that you buy and stick a 9v battery into.
However, even if the smoke detector goes off, the difficulty remains in establishing that the alarm was set off by the air entering the building from outside.
If you have to resort to this sort of action then, perhaps there can be an argument that things are getting just a little bit ridiculous.
Having said all that, I am going out to get rid of all that fresh air that insists on hanging around my house.
Yes, I smoke and just a little fed up with getting continually pushed into cormers by a society that is more than happy to spend the tax dollars I contribute through my legal use of a legally sold product...........