fumehood when building my lab

[Vicke]

Hi.
I am building me a little lab in my garden and i want to start building the fume hood.
First i was thinking of the idea of blowing air in a larger pipe to get a underpressure in the hood, but i also came to think about a hughe fan i have laying in my garage that i can put outside the wall blowing in to the lab creating a overpressure inside and then i just need a pipe from the fume hood and out?
Do you think this is a good idea? at least i will get enough flow for all fumes to get out?
I will be making my own nitric acid and HCL acid and alot of different experiments with acids and cemicals so it might be alot of fumes some times.
Do anyone have a good opinion about this or how did you guys solve fume problems?
I have read on the forum a bit but some things it hard to get in my area.
Tanks!

 

[necromancer]

here is some links that NobleMetalWorks put together

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=40&t=12120&hilit=fume+hood

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=84&t=13454&p=135003&hilit=fume+hood#p135003

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=56&t=12757&p=137680&hilit=fume+hood#p137680

A thread about NOx emissions.

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=47&t=14289&p=143437&hilit=fume+hood#p143437

A thread about one person's set up

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=61&t=13739&p=138003&hilit=fume+hood#p138003
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here is a google search of GRF for scrubber
https://www.google.ca/search?q=scru...j0j4&sourceid=chrome&espv=2&es_sm=93&ie=UTF-8

 

[Vicke]

Thank you alot of good information!
I was thinking of blowing out all the fumes in the nature as most people do when working outside and eaven i have done earlier.
I am again thinking of the first idea of blowing air in a larger pipe made of pvc.
I will use glass to build the fume hood so it wuld resist all chemicals ill use, am i right that regular glass shuld do fine?
Can i use sillicone to glue it all together or shuld i use something else?
Mostly chemicals ill use is to process gold, platina, silver, palladium and to make the acids nitric and HCL so both acids and bases, might eaven use other things becous i like chemistry and experiments.
I need to do some tests with the pressure and flow i can get with the method so i can feel safe when working.
Thanks!

 

[Smack]

Glass not a good idea. Plastic=good idea, safer and easy to work with, back it with wood if you have to.

 

[Vicke]

Okey thanks.
I would like it transparrent so i can have only a little hole to put my hands in so glass was what i came to think of.
I will see what i can find.

 

[necromancer]

here is some ideas

http://www.gloveboxes.com/

 

[Vicke]

Thanks!
Ive got my fan today it is a high pressure ring blower and i think it is hard to find a better fan for this job, so culd be a idea too look them up when you are building.( don't know what you guys are using )
I will order HDPE for the hood it is cheap and has good chemical resistance.
Ill use PVC pipes for the fumes and maby PTFE from the blower into the hood.
Does it seem good so far?

 

[necromancer]

the site administrator may have a very good fan, not sure if its sold yet.

 

[Smack]

Polycarbonate (Polycarb) is easy to work with and very durable, not brittle like Plexiglass (Acrylic). The size of your hood should determine the CFM you will need.

 

[Vicke]

Okay will the polycarbonate resist the chemicals as good as the polyethylene?
I have no idea what cfm i will have
The fan i think blows about 70m3/h and 2 bar but that will blow in a larger pipe and i do not know how to calculate or messure it.
Thanks

 

[butcher]

The opening to your hood will require a certain CFM air flow.

 

[Vicke]

Okay i was thinking of buying material for a 900mm wide hood with 200mm opening to easily reach everything inside, and then ill mount the vent and move the shortside in till i get a good suction in the opening.

 

[4metals]

Start with a drum, add a funnel, you can put the piece you cut out on a track and slide it up and down to close the opening off. The funnel costs about $100 here. http://www.usplastic.com/catalog/item.aspx?itemid=40274&catid=639&clickid=searchresults



You will still need at least a 200 CFM exhaust. (340 cubic meters/hr)
I know a backyard barn refiner who put in a small hood like this and used this blower. http://www.wholesalemarine.com/rule...ducting.html?gclid=CLO67rmqw70CFeMF7Aod3X0AGQ The model is 240 but it doesn't list the CFM anywhere but he assumes 240 is the CFM. Anyway he was worried about corrosion so he bought 2 to have a spare on hand in case he needed to do a quick change out. 18 months and the spare is still in the box.

 

[Vicke]

That is a good idea realt but sadly i have not realy space for that. In my lab.
I have a bench with a shelf above that i am using as bottom and top for the hood.
and olso i wuld like to be able to use larger setups in it so it is good if it is wide.
Thanks

 

[Vicke]

I have the ventilation on place it is kinda good suction, what i understand it flows 200m3/h if ive got it right.
And i have decided to buy two large storage boxes and put one upside down on top of the other and cut holes for hands and ventilation.
That will make it easy to replace and clean if something happens and it will be no leaks if anything pours out in it.
The pipe on the outside is goung straight up about 4meters to be above all other buildings in my garden but do i have to worry about condens that will fall back down?
Maby i need to take a hole in the 90° bend and a drain pipe to a canister outside?
Thanks.

 

[goldenchild]

Start with a drum, add a funnel, you can put the piece you cut out on a track and slide it up and down to close the opening off. The funnel costs about $100 here. http://www.usplastic.com/catalog/item.aspx?itemid=40274&catid=639&clickid=searchresults



You will still need at least a 200 CFM exhaust. (340 cubic meters/hr)
I know a backyard barn refiner who put in a small hood like this and used this blower. http://www.wholesalemarine.com/rule...ducting.html?gclid=CLO67rmqw70CFeMF7Aod3X0AGQ The model is 240 but it doesn't list the CFM anywhere but he assumes 240 is the CFM. Anyway he was worried about corrosion so he bought 2 to have a spare on hand in case he needed to do a quick change out. 18 months and the spare is still in the box.

I'm a bit blown away by this.

 

[necromancer]

Start with a drum, add a funnel, you can put the piece you cut out on a track and slide it up and down to close the opening off. The funnel costs about $100 here. http://www.usplastic.com/catalog/item.aspx?itemid=40274&catid=639&clickid=searchresults



You will still need at least a 200 CFM exhaust. (340 cubic meters/hr)
I know a backyard barn refiner who put in a small hood like this and used this blower. http://www.wholesalemarine.com/rule...ducting.html?gclid=CLO67rmqw70CFeMF7Aod3X0AGQ The model is 240 but it doesn't list the CFM anywhere but he assumes 240 is the CFM. Anyway he was worried about corrosion so he bought 2 to have a spare on hand in case he needed to do a quick change out. 18 months and the spare is still in the box.

I'm a bit blown away by this.

i am confused by this..... you being funny ?? there is no punctuation or icons (all black and white).

 

[Vicke]

I will have alot smaler opening than 4metals so it shuld be enough and if it turns out not to be i have a second fan.

 

[goldenchild]

Start with a drum, add a funnel, you can put the piece you cut out on a track and slide it up and down to close the opening off. The funnel costs about $100 here. http://www.usplastic.com/catalog/item.aspx?itemid=40274&catid=639&clickid=searchresults



You will still need at least a 200 CFM exhaust. (340 cubic meters/hr)
I know a backyard barn refiner who put in a small hood like this and used this blower. http://www.wholesalemarine.com/rule...ducting.html?gclid=CLO67rmqw70CFeMF7Aod3X0AGQ The model is 240 but it doesn't list the CFM anywhere but he assumes 240 is the CFM. Anyway he was worried about corrosion so he bought 2 to have a spare on hand in case he needed to do a quick change out. 18 months and the spare is still in the box.

I'm a bit blown away by this.

i am confused by this..... you being funny ?? there is no punctuation or icons (all black and white).

No I'm serious. So simple but never thought of it. It gives me ideas for my next hood.

 

[Richard NL]

No I'm serious. So simple but never thought of it. It gives me ideas for my next hood.

Indeed a very good idea!!

What if we would take a ibc container,much more space.
A used one is very cheap.
One stacked on the other.

The only problem i can think about is fire/heat.

Best regards Richard.