Fume hood sources Canada - Page 1
Forum section: electronics / general

author: WarSim
author_rank: Frequent Contributor
timestamp: February 01, 2014, 07:49:39 pm
content: I have done several searches for every work I could think of on the topic and receiving zero finds.I am a little surprised that there isn't a single post found on the subject.I am moving and setting up a new lab. Because I mill and tin my own prototypes I am looking for a fume hood solution. This is not a business, just an advanced hobby setup the budget is small. I should be able to duct out solder fumes, IPA, liquid tin ... fumes without breaking the bank.I have done a lot of searching on the subject but fall short of a solution due to to the lack information.For example one type of blower that should be compatible is a bilge blower. Bilge blowers for several certifications must be safe to exhaust vapours of in-flammable liquids. Surprisingly enough not all areas have this requirement. Therefore it can not be assumed that all marine bilge blowers can be used in in-flammable vaporize environments.Further to make these searches useless not a single blower of any general type specifications do not include certifications either. Therefore tracking back to their capabilities to the certification requirement is not possible.For failed solutions I have found cheep fan/blowers that should be usable with no useful specs or blowers with defined specifications vastly exceeding my requirements and budget.I know there is a middle ground, I have seen it in use by others. I can not seem to source it for myself. Can anyone help with a few leads? I am in Canada moving to Ontario.Sent from my iPad using Tapatalk

author: WarSim
author_rank: Frequent Contributor
timestamp: February 01, 2014, 08:02:49 pm
content: Yes there is a USCG certification but as far as I could find it contains nothing on flammable environments.I only found specs on certifications on how the CFM is measured, the CFM required and the inlet and vent placment.Beyond the warning of flammable vapour buildup nothing else is mentioned on the subject.No static pressure requirements either.Sent from my iPad using Tapatalk

author: ConKbot
author_rank: Super Contributor
timestamp: February 03, 2014, 12:12:27 pm
content: Good thinking being concerned about what all you're venting. But what are the flammable liquids you'll be venting? IPA has a lower explosive limit of 2%, but a OSHA PEL of 400 PPM (0.04%) So you'd have to worry about poisoning yourself from the fumes well before you have to worry blowing up your fume hood.Even with a little 50CFM kitchen hood ( 0.0807 lbs of air in a cubic foot) you'd have to evaporate 0.0807 lbs/minute (0.051246 lb/fl-oz for IPA) or 1.574 ounces/minute of pure IPA. So if youre not anywhere near evaporating that much, you should be far enough below the LEL that vapor flammability isnt a concern.Just to be on the safer side I'd use an induction motor and not a brushed motor if I had mains AC available to me

author: WarSim
author_rank: Frequent Contributor
timestamp: February 03, 2014, 06:11:08 pm
content: Yes the reason for the venting is almost entirely for the removal and dilutions of toxins. I agree that I will be dealing with low combustible levels in general.I am trying to prevent negative possibilities. For decades the safety processes in my work environment was to prevent all possibilities. The lawyers argue the weight probabilities if something bad happens.I conceded that a vent fire is not probable but it is possible, I have seen one. I also accept that the vent flash fire ignited from a vent fan spark did not result in losses. It was a small flash fire that made a loud bang from hot IPA vapour. The person it happened to was using heat and IPA to remove epoxy conformal from a damaged board.I was hopping to order an induction motor driven fan or a TENV motor driven fan. Unfortunately I can't find the needed specs to select the right fan. At this point i believe, I am left with finding a local source where I can inspect it's construction. Any configuration is possible, I am finding the parts first. Then I will design the system from what I can obtain.The only factor against an induction motor is I don't have a red seal. To make it happen I would need to find an experienced electrician to sign off first. In my experience new electricians have issues with applying the rules to non commercial applications. It is the largest reason why I use walk warts when I can. This way there is a definite line between red seal / CSA territory and CSA only teratory. I am done paying a red seal for hours explaining how my circuits work just because I have an AC power source option. Oops, a bit of a rant there.Sent from my iPad using Tapatalk