been reading some things on the internet for making a flowhood.

I am a science DIY'er. I really would like to start some micropropagation at home, but one of the requirements is a genuine flowhood.

A flowhood is basically air pushed through a hepa filter. It ensures that the air around your sterile media containers is free of contaminations.

Has anyone on /diy/ ever built a flowhood? How would you do this? I checked google and read some of the online guides, but none of them seem to really point me in the right direction.

So what do you think /diy/?