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Re: Welding Fume Extractor:
[Re: jcc]
#2899266
03/15/21 09:24 AM
03/15/21 09:24 AM
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Joined: Jan 2003
Posts: 10,707
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,707
North Dakota
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The only comment I have is that for a 4" system like you have your hood may be too big for your fan. I'm guessing that fan is good for 100 cfm or so? And I'm guessing your hood is about 6' x 2'? You only have about 8 ft/min face velocity. That is really low. Typically the face velocity should be a minimum of 60 ft/min. You can try what you have and if you are happy, you are the only one that needs to be satisfied. If it were me, I'd discard that hood and use something like this. Welding Fume Nozzle I'm not cheer-leading for this particular one, just the concept. We used this style at one of the power plants I worked at. We had a common large blower with a suction trunk that had individual drops for each welding table using hose and a bell style end with a magnet attachment. Worked for us. In fact, if a weldor got the hose to close to the work they complained it was like welding in a windstorm!
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Welding Fume Extractor:
[Re: 6PakBee]
#2899499
03/15/21 08:31 PM
03/15/21 08:31 PM
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Joined: Feb 2005
Posts: 3,958
SW Fla.
CYACOP
master
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master
Joined: Feb 2005
Posts: 3,958
SW Fla.
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The only comment I have is that for a 4" system like you have your hood may be too big for your fan. I'm guessing that fan is good for 100 cfm or so? And I'm guessing your hood is about 6' x 2'? You only have about 8 ft/min face velocity. That is really low. Typically the face velocity should be a minimum of 60 ft/min. You can try what you have and if you are happy, you are the only one that needs to be satisfied. If it were me, I'd discard that hood and use something like this. Welding Fume Nozzle I'm not cheer-leading for this particular one, just the concept. We used this style at one of the power plants I worked at. We had a common large blower with a suction trunk that had individual drops for each welding table using hose and a bell style end with a magnet attachment. Worked for us. In fact, if a weldor got the hose to close to the work they complained it was like welding in a windstorm! This is all correct. As an option he could add a curtain across the top or sides and minimize the size of the opening. This is how the fan should be sized using an engineered approach, without guessing. That 4" outlet , if too small can still be used by adding a higher static pressure rated fan. Look at the fan curve for static vs flow rate.
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Re: Welding Fume Extractor:
[Re: 6PakBee]
#2899529
03/15/21 10:26 PM
03/15/21 10:26 PM
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Joined: Jan 2003
Posts: 8,393
Highland, MI.
Sunroofcuda
OP
master
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OP
master
Joined: Jan 2003
Posts: 8,393
Highland, MI.
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The only comment I have is that for a 4" system like you have your hood may be too big for your fan. I'm guessing that fan is good for 100 cfm or so? And I'm guessing your hood is about 6' x 2'? You only have about 8 ft/min face velocity. That is really low. Typically the face velocity should be a minimum of 60 ft/min. You can try what you have and if you are happy, you are the only one that needs to be satisfied. If it were me, I'd discard that hood and use something like this. Welding Fume Nozzle I'm not cheer-leading for this particular one, just the concept. We used this style at one of the power plants I worked at. We had a common large blower with a suction trunk that had individual drops for each welding table using hose and a bell style end with a magnet attachment. Worked for us. In fact, if a weldor got the hose to close to the work they complained it was like welding in a windstorm! The width is 38", depth is 11", & height is 17", so it's not gigantic. Also, as said earlier the fan is rated at 200 cfm, not 100. I'll let y'all know once I get some welding underway - probably tomorrow.
No Man With A Good Car Needs To Be Justified
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Re: Welding Fume Extractor:
[Re: BIGGERED]
#2900231
03/17/21 11:24 PM
03/17/21 11:24 PM
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Joined: Jan 2003
Posts: 8,393
Highland, MI.
Sunroofcuda
OP
master
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OP
master
Joined: Jan 2003
Posts: 8,393
Highland, MI.
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UPDATE: I finally did some welding this evening & this setup works better than I could have imagined. NO fumes, NO smoke. I even tried welding without a N95 mask (that's all I could fit under my welding helmet) - I don't need a dust mask anymore. The 4" system very adequately pulls everything out almost instantly - I'm loving the new setup!! VERY SATISFIED. I wish I would have done it years ago.
Last edited by Sunroofcuda; 03/17/21 11:27 PM.
No Man With A Good Car Needs To Be Justified
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Re: Welding Fume Extractor:
[Re: 6PakBee]
#2900936
03/19/21 11:27 PM
03/19/21 11:27 PM
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Joined: Jan 2003
Posts: 8,393
Highland, MI.
Sunroofcuda
OP
master
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OP
master
Joined: Jan 2003
Posts: 8,393
Highland, MI.
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One more photo - the enclosure is behind what I'm welding, I don't weld inside of it. So it's pulling the fumes away from me & up & out.
No Man With A Good Car Needs To Be Justified
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Re: Welding Fume Extractor:
[Re: Sunroofcuda]
#2901921
03/23/21 09:51 AM
03/23/21 09:51 AM
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Joined: Jun 2004
Posts: 3,376
St. Charles, MO
wingman
Uncreative Title
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Uncreative Title
Joined: Jun 2004
Posts: 3,376
St. Charles, MO
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UPDATE: I finally did some welding this evening & this setup works better than I could have imagined. NO fumes, NO smoke. I even tried welding without a N95 mask (that's all I could fit under my welding helmet) - I don't need a dust mask anymore. The 4" system very adequately pulls everything out almost instantly - I'm loving the new setup!! VERY SATISFIED. I wish I would have done it years ago. Glad it works for you. As I get older (wiser?) I find myself trying to be safer with stuff like that. Safety glasses, nitrile gloves, hearing protection, knee pads, etc. 20 year-old me would have not wanted to spend the extra few bucks on that type of thing, and would not have used it anyway....
1969 Dodge Coronet Super Bee 383 A4
1970 Plymouth Road Runner 440 FC7 (sold)
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Re: Welding Fume Extractor:
[Re: wingman]
#2901954
03/23/21 11:04 AM
03/23/21 11:04 AM
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Joined: Jan 2003
Posts: 10,707
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,707
North Dakota
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Glad it works for you.
As I get older (wiser?) I find myself trying to be safer with stuff like that. Safety glasses, nitrile gloves, hearing protection, knee pads, etc. 20 year-old me would have not wanted to spend the extra few bucks on that type of thing, and would not have used it anyway....
Ain't it the truth......... 
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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