Forgive me if this is obvious, but in the scant 2 months I've been haunting this and other forums, I haven't seen any pics of a Still Air Box with 3 holes.
For reasons we all understand, it's a pretty good idea to keep fire outside the box. I think nearly everyone agrees about this. However, 35 years ago, when I was a young idiot instead of the distinguished old idiot I am today, I did not have this knowledge. I modeled my inoculation box after a sketch I saw in the classic Oss and Oeric guide to growing mushrooms. It clearly showed an alcohol lamp inside the box, and I reproduced this design faithfully.
It worked well enough, for a few weeks. Before doing an inoculation, I would lavishly spray the interior of the box with Lysol, and then I would spray my hands and arms as well. Sometimes, I'd spray the lids of my agar and grain jars, too, in case any loose spores were hiding there. Then I would light the alcohol lamp, and get down to business.
Imagine my surprise when, one day, I lit that lamp and a blue ball of fire blossomed in the air around my lighter. It was kind of beautiful, actually. The plastic covering my box melted away and a column of fire shot up into the room. Tongues of flame enveloped my arms, singing all the little brown hairs. Foom!!!! And then it was over.
I completed the rest of that agar transfer in the open air, and there were no contaminants. ;)
Anyway, when I took up mycology again a couple of months ago, I remembered that little incident. So, when I made my new box I made sure to cut a third hole in the back side, so that I could sterilize my loop without having to remove my hands.
It's a really small thing, but convenient.