My darkroom is about 10' x 10'. I have a small Doran fan/ vent that just doesn't work all that well. I decided to try my air purifier. Its not just any air puri fier. Its an exceptional machine that destroys odors, its an Alpine if anybody i s familiar with it. I'd say it takes out 90% of the odor. There is a little ambe r light inside it, and sometimes a little green light comes on. It does not effe ct my printing, but I don't know if I can block this light when proccessing my f ilm. I was just wondering what everyone who proccesses black and white here does . Calumet sell a ventilator called Vent Axia. Does anyone have experience with t his. I have a window in my darkroom. I built a frame out of wood the size of the window and covered it with light tight plastic, attached to the frame was the D oran fan. The frame is easily removable, so I could attach another type of fan/ ventilator if anyone has any suggestions. I admit my Doran fan is a small one, m aybe meant for a room 6'x8', but do they work that well at all, anyway? Thanks.