I'm having a hard time finding any references as to whether Sulfur Hexafluoride, a clear, heavier than air gas used for leak detection in buildings, would set off smoke (either ionizing, photoelectric, or aspirating) detection systems. Does anyone have any background or references on this subject they'd like to share?
Well almost anything sets off smoke detectors.
Now it has to get to the level of the detector for it to sense it.
Now if you think that you can isolate the gas say in a few rooms or areas, cover the smoke detectors during the test time.