I got no answers for this, but I built my fuming hood finally (few months ago). I went to the Chemistry University and I asked some students to show me their fuming hoods. Those were some professional ones, for sure, but I saw the system.
The most complicated part (but not THAT difficult to make actually) is the pulley system that holds the door opened where you let it. You just have to figure out the weight of the door + the friction force given by the sliding action. In my case the friction was kind of big and the door didn’t slide well. Grease did the job perfect, now it slides like professional ones. To find the weight, trial and error will do. The door slides using two U shaped aluminium rails that get one into the other.
I bought a fan for ventilating pubs. The bigger, the better (in certain limits, sure).
I’ll answer to other questions if anybody is interested to build one, if I can help.
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