Quote Originally Posted by RalphLambrecht View Post
I was in Howard Bond's darkroom once, and he has no darkroom door at all. The whole entrance is designed as a light trap. You walk around a double corner in which the walls are painted flat black. It is open and yet light tight, which is great for a teaching darkroom where people can go in and out without disturbing the session. It takes some floor space but is very convenient and offers a lot of ventilation.
That's how I had my two darkroms at work in the 70's & 80's, one was dedicated to negatives & emulsion manufacture the other printing and the light trap u-shape entrances take relatively little extra space compared to what's needed for a hinged door anyway particularly if you also add a curtain either side. The added convenience is well worth while particularly when others use the darkroom as well.