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There is a Pertronic 2151 BPI photoelectric smoke detector that might solve your problem It’s advertised as having a custom integrated circuit incorporating signal processing to reduce false alarms. The sensing chamber is sealed against back pressure air flow and the chamber is also protected by a fine mesh screen to limit access by dust and insects. The alternative is to limit smoke and vapours in your unit or trying to disperse them with a fan.
The cost of a weatherproof detector is $125 (GST excl.) before fitting. The weatherproof detectors are wired directly into the fire detection system connecting to the fire indicator panel. The non-weatherproof detectors rotate and click into a base with metal contacts. As far as I know, all detectors wired into the fire emergency system need to be programmed before fitting so that the fire panel identifies their location if they are triggered by smoke/heat.
Our 6-year old non-weatherproof detectors in the car park and common areas of the building have been triggered an average of almost 3 times per year which puts them on the limit for a nuisance fine from the Fire & Emergency Services on top of their call-out fees. Which is why we’re installing weatherproof detectors in the car parks.
Our smoke and heat detectors have been triggered by a bug, a ‘baby’ spider’s web (almost invisible to the naked eye) and cigarette smoke (in a fire stairwell). The most common causes of ‘false alarms’ has been humidity, dust and corrosion of contact points (in the base the old detector clicks into).
On a positive note, in six years, we haven’t had to schedule an annual practice fire/emergency evacuation. Unfortunately, the boy-who-cried-wolf syndrome now applies in our building.
Doesn’t sound right as the bathroom exhaust fan services one unit and not ‘all’ units. Even if part of the exhaust fan is mounted on the exterior wall of the affected bathroom, it still only services one unit.
If the exhaust fan motor/motors are being replaced and are in the cavity between the bathroom ceiling and the floor of the unit above, it’s ‘within’ the owner’s unit.