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Studio -- Show us your studio setup |
2012-06-12, 6:26pm
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Annette
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Join Date: May 13, 2012
Location: St.Pete Beach, FL
Posts: 19
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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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2012-06-12, 7:54pm
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Curmudgeon Engineering
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Join Date: Feb 15, 2006
Location: Near Seattle, WA
Posts: 1,723
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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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2012-06-13, 8:36am
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Annette
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Join Date: May 13, 2012
Location: St.Pete Beach, FL
Posts: 19
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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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2012-06-13, 8:52am
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Annette
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Join Date: May 13, 2012
Location: St.Pete Beach, FL
Posts: 19
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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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2012-06-13, 8:56am
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Curmudgeon Engineering
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Join Date: Feb 15, 2006
Location: Near Seattle, WA
Posts: 1,723
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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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2012-06-13, 8:59am
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Curmudgeon Engineering
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Join Date: Feb 15, 2006
Location: Near Seattle, WA
Posts: 1,723
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Found it!
Artglassanswers.com
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2012-06-13, 10:29am
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Annette
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Join Date: May 13, 2012
Location: St.Pete Beach, FL
Posts: 19
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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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2012-06-13, 1:42pm
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Annette
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Join Date: May 13, 2012
Location: St.Pete Beach, FL
Posts: 19
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I guess I should have posted this in safety...
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2012-06-13, 3:15pm
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Curmudgeon Engineering
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Join Date: Feb 15, 2006
Location: Near Seattle, WA
Posts: 1,723
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Studio works...
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2012-06-13, 6:14pm
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Annette
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Join Date: May 13, 2012
Location: St.Pete Beach, FL
Posts: 19
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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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2012-06-13, 8:57pm
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Curmudgeon Engineering
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Join Date: Feb 15, 2006
Location: Near Seattle, WA
Posts: 1,723
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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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