Very good..... It would indicate to me that you have it pretty well mastered.... About 2.5 to 3 min into test your cigarette smoke was drifting from right side of picture right towards hood which indicates you have air coming from behind you.....
This is by far the best series of test I have yet to see.........
As for the adventurous, there are chemical smoke sticks made and sold (not a hazmat item) for testing air flow/air currents.....
GOOGLE search: "smokes stick hvac".... or something similar
http://store.metermall.com/shared/St...FRcdawodBwmUag
Probaly can find a number less than 12 in a purchase and cheaper with some searching....
There is also is recipes on GOOGLE for "smoke bombs" but I don't recommended trying those.... And some ingredients may be hard to get, and manufacturing processes may be unsafe...
Dale
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San Francisco - A Few Toys Short of a Happy Meal