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.