Fuming hood plans and details

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    Hello there!

    I’m building a fuming hood out of acrylic (also known as “plexiglass in some places).

    I wanted to ask the more experienced guys in here if anyone could help me with some details, maybe a plan for building it. Especially at the door: a sliding one or a flipping one? I agree sliding is better, but how you do the sealing on it, and also the system to stop at a certain height? Also, the Mercury vapors are heavier than air, so they’ll get to the bottom of the box; do I have to make a bevel there, so they don’t get out of the box? If yes, how big? When you turn on the fan, where is the air entering the box? (I assume in the bottom, as long as there should the Hg vapors concentrate).
    I bought a fan for ventilating pubs with a debit of 280 cube meters per hour (through a pipe of 125 mm diameter). I was wondering if that’s enough, though it sounds good to me. I know it’s not a professional chemical resistant fan (those are WAY too expensive), if it breaks I don’t really care, I’ll buy another one.

    It would be a pity that this forum, full of so much useful information, to just disappear.
    Hoping that someone will hear my call, thank you in advance,



    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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