you cant, Fire systems work by either detecting light via a small area, if it becomes darker or so due to particules blocking it, it sets it off, anothere is a slightly more radioactive kind, it shoots a beam of somethings across to the other side, like a laser, if this laser' is interrupted the alarm ges offf.

try blowing dust into it. If it is a particle-based detector dust will also obscure the sensor and set it off. Temperature might as well if it has the red liquid inside a glass cylinder. just heat that up or shatter it with something.

hold a bag of just-popped popcorn up to a detector for a few seconds.

OP here - Don't really mean without any kind of smoke or aerosol spray, but more like the stealthiest way to do it.

>>294
find a detector in an unused place with a microwave, pop some popcorn and hold the bag up to the detector for a few seconds. Or just set the microwave for like 15 minutes and the bag will just light on fire. Maybe a piece of paper in there for like 20 minutes would do the trick too.

Saw my mate set off the alarm at uni dorms by "drying" ganja in the communal microwave. Burst into flames. Not real stealthy though.
Man we were so wasted.....hmm scissors...

>>317
"drying"???  why?  Was it fresh picked?  can you even do that in a microwave?  

stupid