Fume hoods plans ?

[elfixx]

I, i'm new here this is my first post but i've been reading almost every topic for a month. I'm trying to build my own fume hood using a squirel cage blower and y pipe. Can anybody tell me why the air is blowing at both end of the pipe instead of blowing 1 way and sucking air trought the other? or can anyone post a good fume hood plan?

 

[butcher]

would need venturi effect, like a dredge works, or steam jet pump, water jet pump Etcetera. I have not made one sorry not much help, but this should get you pointed toward sucking air.

 

[butcher]

http://www.escoglobal.com/ductless/PDF/Ductless_booklet.pdf

 

[Mida]

The apparatus you see in the in the image is supposed to be a substitute for a fume hood,using it for small batches.Pratically,it will neutralize any toxic and corrosive vapours of AR,during the distillation.
The thing not clear to me is why you have to pass the vapour in the acetic acid solution,before to pass it trought the soda.Any suggestion?