One thought here - are you doing the incense test with the torch on? I seem to remember someone saying it should be done this way. The fumes you are trying to vent are hot and the hot air may help to carry the fumes (and smoke) up enouch to be captured by the hood. I use a box-type fume hood with a baffel across the front. The smoke does waft up, but it is captured and exhausted. Without the front baffel, some smoke does escape. I haven't tried testing without the torch on - actually I just turn the oxy down until I can see a little smoke to test the exhaust.
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Judi
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