Maybe a little off-topic... I want to measure the airflow rate (from a small axial fan) through a ducted system. I am thinking of using a smoke test and time how long it takes to get through the system (which comprises 100m ducting and a similar overall area channelled box). Any traps? What type of "smoke" works best? What errors are typically in this sort of measurement? How is this sort of thing is usually done? Are there any better ways to measure air flow rate? Maybe measure pressure somehow and use the pressure vs airflow graph from a datasheet? Any other traps?
Any help appreciated.
Thanks Dave :)