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Studio -- Show us your studio setup

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  #1  
Old 2012-06-12, 6:26pm
Kapferaa Kapferaa is offline
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Join Date: May 13, 2012
Location: St.Pete Beach, FL
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Default Ventilation help

I have read a lot about this but it does not make much sense.... I have a bobcat waiting to be used but need some help with ventilation.

The torch will be set up in my shop which has 10 feet tall ceilings and measures 17x45 feet. I am planning to have my torch set up on a steel table infront of a door with a hood on the table venting through the door. Table is 24 inches deep and the distance to the door another 6-12 inches depending on how close the torch can be to the hood. Ventilation will be straight through the door.

I keep looking at the calculations and can't figure out what size fan I need.....

Would appreciate any suggestions!
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  #2  
Old 2012-06-12, 7:54pm
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cheng076 cheng076 is offline
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First of all the size of the room does not matter for CFM calculations. What does matter is the size of the hood or whatever 'catchment' you use. The distance to the door and whether the bad gasses vent thru it or a wall or ceiling only matters if A. you must have at least 10 feet of seperation between the air comming in and the air going out or B. the ducting is long enough or has other 'friction' causing issues that reduce the efficiency a whole bunch.

So to get the size of the fan you need measure the size of the hood; how wide is it in feet by how deep is it (deep as in front to back) in feet. Multiply those numbers together then multiply by 125 (a constant) and that will give you a minimum fan size in cubic feet per minute.

PJH
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  #3  
Old 2012-06-13, 8:36am
Kapferaa Kapferaa is offline
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Default Hakko fume extraction

Hi PJH

I guess I have to get a hood that fits my space first and then do the math from there.
I also looked at this today and i am not sure if something like this would work for my torch with a bigger hood piece..

http://www.hakkousa.com/detail.asp?C...ID=4878&Page=1
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  #4  
Old 2012-06-13, 8:52am
Kapferaa Kapferaa is offline
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I just answered my own question, the Hakko fume extractors will not work.

Ho do you decide what size hood you need?
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  #5  
Old 2012-06-13, 8:56am
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cheng076 cheng076 is offline
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That system is designed for a very much smaller volumn of contaminated air removal than what is generated by even the smallest glass working torch.

Typically you will want at least 36" of bench width to work in and you said the bench is 24" deep. As a minimum I would suggest a hood about 30" to 36" wide and 20" deep, mounted at about forhead level. There are several systems out there that are similar to the link but much bigger and they can and do work well. Do a search for hoods and look at the various configurations people are using. Something as simple as a 24" dia. funnel shape on the end of 6" or 8" ducting can work. The above mentioned hood would require about 650 CFM fan size BTW.

Dale often mentions an informational website but I can't recall what it is at the moment; I thought I had it bookmarked. See if you can find that site as he/they have a lot of good info there.

PJH
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  #6  
Old 2012-06-13, 8:59am
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cheng076 cheng076 is offline
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Found it!
Artglassanswers.com
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  #7  
Old 2012-06-13, 10:29am
Kapferaa Kapferaa is offline
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Thank you,

I was just on that and it has great info!

I think the 24 inch funnel will work for my space and I found a source for a 650 cfm fan as well.

This is coming together now
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  #8  
Old 2012-06-13, 1:42pm
Kapferaa Kapferaa is offline
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I guess I should have posted this in safety...
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  #9  
Old 2012-06-13, 3:15pm
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cheng076 cheng076 is offline
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Studio works...
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  #10  
Old 2012-06-13, 6:14pm
Kapferaa Kapferaa is offline
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Sure does. Looked all over for one of those funnels today without luck...will try again tomorrow
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  #11  
Old 2012-06-13, 8:57pm
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cheng076 cheng076 is offline
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Look for a vent terminal or vent terminal plenum. You may have to have a HVAC shop make one... maybe cost $15 to $20 .
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