I'm having air circulation problems in my mini-greenhouse. The setup is as follows:
1" pvc pipe frame, 4'L, 3'H, 2'd, covered in clear vinyl, flourescent grow lights suspended above, room temp(averages about 72F)
Contains mostly neps, also some drosera and cephs. The plants are sitting on plastic crates.
I haven't found a happy medium of high humidity and good air circulation. If I leave a corner of the vinyl open, the humidity drops(or fluctuates) too much. Leaving it closed keeps the humidity up, but sooty mold appears. I bought a 6"diameter fan for the enclosure, but it causes too much "wind," and causes the humidity to flucutate wildly(which my nep. lowlanders really don't appreciate...). I suspect a smaller fan(such as those found on a cpu motherboard) might work, but have been unable to find anything smaller than 6" that runs on a/c power. [img]http://www.**********.com/iB_html/non-cgi/emoticons/new/smile_l_32.gif[/img]