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Safety -- Make sure you are safe!

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  #1  
Old 2013-09-14, 8:56pm
eigna19 eigna19 is offline
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Default ventilation and air exchange

Do I need the same size fan for my air exchange that I have for my ventilation? I think i am going to get this fan for my ventilation... 6" S600 Centrifugal Inline Fan 269 CFM 6 Do I need to get two of them?
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Old 2013-09-14, 9:20pm
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houptdavid houptdavid is offline
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For? You do not need to blow air in
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Old 2013-09-14, 9:25pm
eigna19 eigna19 is offline
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Oh, Just an open air duct, no fan huh. Here I thought I was going to be blowing cold air in, lol. Thank you
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Old 2013-09-14, 9:34pm
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But that fan is too small
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Old 2013-09-15, 7:10am
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Fan is to small... Minimum 500cfm... Also best to calculate fan size by measuring "face opening" of hood and calculating fan size by what opening of hood size is and what size duct you are using to move exhaust air...And nature abhors a vacuum.... As your exhaust fan draws air out of hood (over torch), it causes a slight low pressure or vacuum... Nature will try to fill that vacuum by pushing fresh air into area, thusly trying to fill low pressure and causing the clean makeup air flow you desire...

Dale
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Old 2013-09-15, 2:22pm
eigna19 eigna19 is offline
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Dale,
I was going to go with this vent set-up http://www.andreaguarino.com/VENTILATION.html where would I put the make up air duct? Behind me, or above me?
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Old 2013-09-23, 4:45pm
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I have often wondered what your take on this system would be Dale. I know a lot of people go with this, but for the life of me, I just don't see how this can work, as efficiently as a hood, there just has to be no control in collecting the nox to evacuate it. After seeing those pictures taken with special equiptment that could photo the gasses released from a torch while it was running in the Glassline article years ago, much less what happens when glass is manipulated melting and spewing gasses in the torch flame, for me, I just would not feel safe with that.
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Old 2013-09-24, 7:18pm
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It relies on pure velocity and air flow (volume) to capture ...

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Old 2013-09-24, 9:15pm
LarryC LarryC is offline
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Quote:
Originally Posted by Mary K View Post
I have often wondered what your take on this system would be Dale. I know a lot of people go with this, but for the life of me, I just don't see how this can work, as efficiently as a hood, there just has to be no control in collecting the nox to evacuate it. After seeing those pictures taken with special equiptment that could photo the gasses released from a torch while it was running in the Glassline article years ago, much less what happens when glass is manipulated melting and spewing gasses in the torch flame, for me, I just would not feel safe with that.

If they are designed correctly they can work very well. The downside is that the effective capture area is small so they can be restrictive to work under. I used a good one for years before moving to my current space which has a 8 ft by 5 ft hood.
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Old 2013-09-27, 1:12pm
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I would be interested in reading that Glassline article. Do you remember what issue?
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air exchange, fan, ventilation


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