I was actually thinking about flow hoods and what they do recently. do you think if someone used a homemade one that would bee sufficient, if they used the correct filters and fan! i read that people make them to grow orchads and mushrooms, 2 notoriously impossible growing projects. i would assume if they are sterile enough to keep those alive they would be asceptic enough to keep out any microbial dangers. this iis a question id like to know the. answwer to, if this is the case there wouldn't be much of an excuse for anyone not to have one.