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thanks Terry quick google found it here for only $13.50 a can! http://www.sparkydirect.com.au/p/931871/can-of-smoke-lt711.html There you go, you too can start up a smoke alarm testing company :)

Here's some info regarding positioning http://www.changeyourbattery.com.au/positioning.html I'd be interested in how the smoke alarm companies test using smoke simulation.