A gallery of home built hoods and fume scrubbers _hood_

[SRM]

Just be aware that exposing wood fibers to some of the acids used in refining can create a fire hazard at the minimum.

 

[J.Najam]

Just be aware that exposing wood fibers to some of the acids used in refining can create a fire hazard at the minimum.

Oh alright, will bear that. Ive to replace a shelf on this anyways as its wood is torn exposing the underlying fibers as mentioned. Also Ive to cover it with an epoxy paint I guess Ill give it a white one.

But the main concern is the scrubbing setup and Im kind of trying to figure that out atm.

 

[J.Najam]

I have decided to let go of the scrubber as it doesn't seem to be a viable option here if someone has a better suggestion kindly redirect me there. Im planning on using and installing an exhaust fan directly and draw a PVC shaft from the cabinet to near the pipes then install a blower under the PVC pipe
View attachment VID20240922174514.mp4
and extend the opening straight atop. I still am confused about the fan and/or blower needed in this setup.

If anyone thinks a scrubber can be easily setup here, kindly enlighten me with the knowledge. This video is all the working space I really have.

 

[Martijn]

if someone has a better suggestion kindly redirect me there.

Slow reactions in large beakers filled to max. one third to leave room for the vapors (NO2, HCl) to condense back on the wall and watch glass to reuse the acid and your fume hood fan will dilute and disperse the few vapors that do will be escape below emission levels in terms of grams per kubic meter of expelled air.

 

[Martijn]

I still am confused about the fan and/or blower needed in this setup.

If you use a venturi to suck air from the hood, it does not matter which kind of fan you use. As long as the output is good enough to make it work.
Test the flow at the opening of the fume hood with the smoke of an incence stick.
A venturi basically means creating a conical restriction at the point where the fume hood air comes in.

 

[J.Najam]

Slow reactions in large beakers filled to max. one third to leave room for the vapors (NO2, HCl) to condense back on the wall and watch glass to reuse the acid and your fume hood fan will dilute and disperse the few vapors that do will be escape below emission levels in terms of grams per kubic meter of expelled air.

Thanks for the response,

All my procedures are carried out with a watch glass, barely do I remember doing any without it.. I have seen some fume emissions but if they can be controlled by so much then I think as you have mentioned it ahould be okay.

If you use a venturi to suck air from the hood, it does not matter which kind of fan you use. As long as the output is good enough to make it work.
Test the flow at the opening of the fume hood with the smoke of an incence stick.
A venturi basically means creating a conical restriction at the point where the fume hood air comes in.

On the other hand I redrew the diagram based on what I understood so please do correct me if wrong again. Also would I really need a blower here or another simple fan would do the trick too?

 

[Yggdrasil]

Thanks for the response,

All my procedures are carried out with a watch glass, barely do I remember doing any without it.. I have seen some fume emissions but if they can be controlled by so much then I think as you have mentioned it ahould be okay.


On the other hand I redrew the diagram based on what I understood so please do correct me if wrong again. Also would I really need a blower here or another simple fan would do the trick too?

I'd do it the opposite way.
Let the blower blow through the venturi and then let the suction in from the side.

 

[J.Najam]

I'd do it the opposite way.
Let the blower blow through the venturi and then let the suction in from the side.

Like this?

 

[Yggdrasil]

Like this?

Like this

 

[J.Najam]

Oh OK. Well here's the issue, if you notice I don't have an opening from the top, rather from the side in the video I have shared. And at this point in time, I'm trying to figure out the best possibility of fume extraction from the hood itself...

 

[Yggdrasil]

Oh OK. Well here's the issue, if you notice I don't have an opening from the top, rather from the side in the video I have shared. And at this point in time, I'm trying to figure out the best possibility of fume extraction from the hood itself...

Does not matter as the fan should be ate the end and blow as straight as possible through the venturi.

 

[Yggdrasil]

Oh OK. Well here's the issue, if you notice I don't have an opening from the top, rather from the side in the video I have shared. And at this point in time, I'm trying to figure out the best possibility of fume extraction from the hood itself...

This is the same

 

[J.Najam]

Ah, that pretty much clears stuff up. So I have final questions hopefully. The fan you're recommending is at point A or B? Also is there any specific CFM or blade speed requirement for either the blower or the exhaust fan?