It is always good to know what have been done in that used hood. You do not want to buy some one contamined with unimaginable variety of nasty chemicals. If it is from some well established lab working with harmless stuff, OK. If it was from some other PM refiner who you does not know personally, I would reject.How much was it to make? I have chances sometimes to buy a used one for 150-250. If it's cheaper to make maybe I will do that.
Just studied what a fume hood needs to be from google and came up with my own designThe scrubber and exhaust system look good, how did you design them? I'm also looking to build a fume hood and am looking for advice before starting. Any other good threads that you looked at?
Gov. of Canada stuff, no idea what they were used for; if sold to the public would they really sell stuff that contaminated?It is always good to know what have been done in that used hood. You do not want to buy some one contamined with unimaginable variety of nasty chemicals. If it is from some well established lab working with harmless stuff, OK. If it was from some other PM refiner who you does not know personally, I would reject.
My old colleague once in a while done a "towel test" - he wetted one square of paper towel in water, "cleaned" the bench, corners, intriguing "dusty" deposits and vent hole insides... And since he has done AAS regularly, he shoved it into the machine and then decided if he is interested
Hard to say. I would say if they knew it is bad, they won´t do that. But if they know, that is different question usually, decomissioned stuff is sold by people who know nothing about it, and also history of the stuff...Gov. of Canada stuff, no idea what they were used for; if sold to the public would they really sell stuff that contaminated?
EDIT: Saw your other reply, could you recycle those 1cm thick plexiglass sheets from monitors as an interior wall attached to wood/plywood?
The old Dish Washers are PERFECT for an inside fume hood. If you search appliances stores and or repairHow about using a dishwasher for starting point for a small fume cabinet?
They're made from chemical resistant plastic and are readily available used for cheap or even free on Craigslist.
Just strip one down to the basic cabinet and remove the pump and spinner assembly. And turn the whole thing upside down. That gives you a round opening on top to attach the vent hose to.
Attaching the door shouldn't be too hard.
It's not very big but for up to a couple gallon size containers. It should work well.
The simplest design is to weld metal chassis from regular square steel profiles, and use thick PE foil for "curtains". Bench would be made of plywood reinforced with some same steel square profile from the bottom.
Exhaust hose would be simply taped to the top PE foil, and from the sides there would be "walls" made from multiple layers of that thick PE foil. Front of the hood will have PE foil curtains - depending on the length of the bench, divided to 3 or 4 segments. For work, you will simply take the segment and place it on the top of the hood. There is no need to have hermetically sealed walls, bottom or top of the hood if you have good exhaust fan, there is always negative pressure inside.
Metal chassis would be then treated with thick acid resistant paint layer.
Not artistic look, but we done well with this oversimplyfied design. Life expectancy is some few years of very heavy use of AR, lots of NOx-es and acids evaporation. All depends on the chassis maintenance. If you manage to protect it well - it will pay off. It is even advantageous to build the chassis from plastic-wood composite. Not that strong as steel, but fairly said - if you do not place any weight to the top of the "roof", there is no need to be super strong
Some folks use regular old table as a bench, and make the "box" from 4 props and the top piece of some thin plywood. Then the sides walls are made of multiple layers of thick PE foil and front from that same foil, cut into few segments. If you feel like investing some money into it, you can buy plexiglass plastic panel and build the front out of if. Sliding upwards/downwards for opening/closing the front of the hood. Like normal regular hoods use to have.
Gov. of Canada stuff, no idea what they were used for; if sold to the public would they really sell stuff that contaminated?
EDIT: Saw your other reply, could you recycle those 1cm thick plexiglass sheets from monitors as an interior wall attached to wood/plywood?
How about using a dishwasher for starting point for a small fume cabinet?
They're made from chemical resistant plastic and are readily available used for cheap or even free on Craigslist.
Just strip one down to the basic cabinet and remove the pump and spinner assembly. And turn the whole thing upside down. That gives you a round opening on top to attach the vent hose to.
Attaching the door shouldn't be too hard.
It's not very big but for up to a couple gallon size containers. It should work well.
Small, yet interestingThe old Dish Washers are PERFECT for an inside fume hood. If you search appliances stores and or repair
companies they are very cheap, especially if they don't work you can pick them up for nothing. Inside is designed to catch and retain fluid. Once the metal and door comes off they are incredible light and very portable. By adding plexiglass to the opening you have an enclosed and air tight unit. Easy to cut holes in the top for exhaust and light. Here are a couple photos of a FREE fume hood
Didn't think to use a washer, great idea; flip it upside down and you have your vent hole as well.The old Dish Washers are PERFECT for an inside fume hood. If you search appliances stores and or repair
companies they are very cheap, especially if they don't work you can pick them up for nothing. Inside is designed to catch and retain fluid. Once the metal and door comes off they are incredible light and very portable. By adding plexiglass to the opening you have an enclosed and air tight unit. Easy to cut holes in the top for exhaust and light. Here are a couple photos of a FREE fume hood
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