AIR

If you had the option of using fresh air from outside with your indoor grow setup, would you? From what I recall there are less contams outside and it seems that it might be better air. I'm soon to go back to my basement set-up and I was trying to figure out how to make it even better, like running dryer tubing from outside to inside. Thoughts?

It depends on the season. In the winter when your house is all closed up, the air can get pretty stale, while outside air is relatively clean. In the summer, when your AC is running, and the trich spores fill the outside air, your house air is probably cleaner. For a grow chamber, it really probably doesn't matter, as sterility isn't an issue. For clean work, you still need a glovebox or flowhood year 'round.

Learning something new everyday.

good luck with the setup

alot depends on the area of the country, too.
season as well.
figure wet warm rainforests of the pacific northwest are full of mold while dry west texas air is relatively 'clean'