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Safety -- Make sure you are safe! |
2008-06-13, 4:11pm
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szglassy
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Join Date: Dec 20, 2007
Location: Palm Coast,Florida
Posts: 253
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Hood size for my torch??
Hi everyone!
I am in the process of planning and re-configuring my new vent system.
The question:
How do you determine the hood size if I am using a Carlisle cc?
Can the same set up also be used when using a minor?
Not both torches at once, but if that was the case of 2 work stations, that means 2 seprate systems?
OH YEA........humidity also plays a factor!
I have been reading all of the threads and could not find anything on that subject.
Thanks!
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2008-06-13, 4:45pm
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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Its not determined by "torch" type...
It starts by selecting a hood size and working from there....
http://www.lampworketc.com/forums/sh...ad.php?t=94212
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2008-06-13, 5:38pm
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Curmudgeon
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Join Date: Apr 12, 2006
Location: Victoria BC Canada
Posts: 5,810
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Quote:
Originally Posted by Dale M.
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Isn't how close the hood is to the torch just as important as how large the hood is?
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Dennis Brady
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2008-06-13, 8:51pm
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
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True..... I over look that fact and tend to think people will put hood as close to torch as practical. Probably a mistake on my part.
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2008-06-14, 6:42am
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Curmudgeon
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Join Date: Apr 12, 2006
Location: Victoria BC Canada
Posts: 5,810
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Quote:
Originally Posted by Dale M.
True..... I over look that fact and tend to think people will put hood as close to torch as practical. Probably a mistake on my part.
Dale
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There seems to be evolving two completely different approaches to hood location. For want of any other terms, I call them the "Amercan" method and the "Italian" method. The "American" method is to install a large fixed position hood similar to those used for kitchens - usually 2 ft or more up from the work station. The "Italian" method is to install a small funnel head positioned only a foot away from the work station.
The "Italian" method could provide the same calibre of exhaust venting as the "American" while using considerable lower capacity fans. Also, having enclosed walls to create a booth would allow for lower capacity fans.
I would think that any figure being suggested to calculate fan capacity requirements would have to consider "air entrapment area" and distance from exhaust port as being equally important, if not perhaps more important, then hood area.
I wonder also if the size of the torch being used isn't also a major consideration in determining exhaust requirements. The larger the torch, the greater the exhaust needs.
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Dennis Brady
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2008-06-14, 10:59am
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szglassy
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Join Date: Dec 20, 2007
Location: Palm Coast,Florida
Posts: 253
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I am reading your thoughts on a American vs. Italian systems.
It seems like a simpler set up to have a funnel,than to build a hood yourself.
True or false?
I have an installer for the electrical and mounting, I'm doing the rest on my own.
That means getting the facts and formulas straight before I do anything!
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2008-06-14, 12:19pm
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
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Actually I have always fancied the funnel system, but "several people" who have been adamant that it is not effective keeps swerving me away from the funnel system. Only problem is (in my mind) is coming up with a formula that will effectively insure proper scavenging of combustion byproducts....
I have to wondered if same 125cfm rule would apply to funnel. Only comprehensive "work" I am aware of was a article in "The Flow"(I think it was) sometime back by a gentleman out of Texas.... Only problem is there was such a hue and cry he was trying to sell everybody his parts or some such silliness, and article was to just a ploy to support his products he decided to walk away from supporting glass work.....
I have asked before for anybody that has funnel system to post the design specifications and never gotten any response.....
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2008-06-14, 2:17pm
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Curmudgeon
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Join Date: Apr 12, 2006
Location: Victoria BC Canada
Posts: 5,810
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Quote:
Originally Posted by Dale M.
Actually I have always fancied the funnel system, but "several people" who have been adamant that it is not effective keeps swerving me away from the funnel system. Only problem is (in my mind) is coming up with a formula that will effectively insure proper scavenging of combustion byproducts....
I have to wondered if same 125cfm rule would apply to funnel. Only comprehensive "work" I am aware of was a article in "The Flow"(I think it was) sometime back by a gentleman out of Texas.... Only problem is there was such a hue and cry he was trying to sell everybody his parts or some such silliness, and article was to just a ploy to support his products he decided to walk away from supporting glass work.....
I have asked before for anybody that has funnel system to post the design specifications and never gotten any response.....
Dale
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I think there are way too many variables for any formula to be more than a SWAG (Scientific Wild Assed Guess). Probably the only sure way to confirm a system works properly is with a smoke test.
I'm selling fans and working on designing possible ventilation packages for sale. In the past couple of weeks I've talked to several companies that manufacture fans and ventilation equipment. None had ever heard of the 125 rule. Where did it come from?
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Dennis Brady
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2008-06-14, 3:55pm
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szglassy
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Join Date: Dec 20, 2007
Location: Palm Coast,Florida
Posts: 253
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Well......
I did see on a few websites ( can't remember now) of people who had pics of Luicco's funnel and someone who taught in Japan with the same set up. Many funnels branched out to each station and positioned over the torches. Plus some here on LE who have a set up that way.
If I were to build my own hood, then perhaps someone has a tutorial on how to make one fairly easy?
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2008-06-14, 4:51pm
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Curmudgeon
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Join Date: Apr 12, 2006
Location: Victoria BC Canada
Posts: 5,810
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Quote:
Originally Posted by szglassy
Well......
I did see on a few websites ( can't remember now) of people who had pics of Luicco's funnel and someone who taught in Japan with the same set up. Many funnels branched out to each station and positioned over the torches. Plus some here on LE who have a set up that way.
If I were to build my own hood, then perhaps someone has a tutorial on how to make one fairly easy?
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I saw 24" x 30" kitchen range hoods at Home Depot for $24.95.
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Dennis Brady
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2008-06-14, 7:20pm
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szglassy
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Join Date: Dec 20, 2007
Location: Palm Coast,Florida
Posts: 253
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Do you mount a kitchen hood on the wall or from the ceiling?
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2008-06-14, 7:46pm
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Curmudgeon
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Join Date: Apr 12, 2006
Location: Victoria BC Canada
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Quote:
Originally Posted by szglassy
Do you mount a kitchen hood on the wall or from the ceiling?
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Attach it to a suspended shelf. Just attach a couple of shelf brackets to the wall, put a 16" deep wood shelf on the brackets and screw the hood to the shelf. Range hoods are designed to attach to a 12" deep shelf, but if you instead use a 16" or 24" deep shelf, you can position the hood further forward. I'd suggest setting the shelf 24" up from your work surface. After installing the hood, install side walls from the shelf down to your table. You'll then have an enclosed booth.
The fan that comes with low cost range hoods is only about 90 cfm. Just remove it and connect ducting with a squirrel cage fan or an in-line duct fan. You can get them in a dozen different sizes. In-line fans are very quite and varible speed. Do NOT get a "booster" fan. These won't draw air but are designed only to boost air that has already been pushed into the duct.
Range hoods are designed to vent into a 4" x 10" duct, but you can easily get fittings to adapt that to whatever round size duct you want. The ultimate size will depend on the size of fan you use.
http://www.aeroflo.com/axc.htm
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Dennis Brady
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2008-06-14, 7:59pm
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szglassy
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Join Date: Dec 20, 2007
Location: Palm Coast,Florida
Posts: 253
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Thanks Dennis!
But I have a carlisle cc and at times I work hot and the flame really shoots out.
I'm not sure about working in an enclosed area.it seems a bit confining.
Could you still hang one overhead?
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2008-06-14, 9:16pm
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Curmudgeon
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Join Date: Apr 12, 2006
Location: Victoria BC Canada
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Quote:
Originally Posted by szglassy
Thanks Dennis!
But I have a carlisle cc and at times I work hot and the flame really shoots out.
I'm not sure about working in an enclosed area.it seems a bit confining.
Could you still hang one overhead?
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Of course you can hang it, but hanging it wouldn't be any different then installing it on an overhead shelf.
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Dennis Brady
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