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Safety -- Make sure you are safe!

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  #1  
Old 2025-01-24, 9:09pm
Solarbeam Solarbeam is offline
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Default 100th ventilation question

Hey folks!! Ive searched through quite a few old posts to try and learn about how to properly vent my new set up, but Im still struggling to sort it out.

Im setting up in my basement. Concrete floors, stone and brick foundation/walls. Ive got a window directly infront of my table so I can easily vent directly outside. And about 10 feet to my left is a full size door to the outside I can open for replacement air. The furnace and water heater are on the other side of the room around a corner so Im not too worried about air pressure affecting them.

I thought about getting this vent fan, and propping the window open enough to secure it to one side, lined up with the torch and just block/insulate the open side.
It claims 988cfm, and I wouldnt need ductwork. Not sure if I should put a hood infront of it?

I dont have enough post history for links but this is the title of it on amazon
"HG Power 10 Inch Metal Exhaust Fan with Switch, Powerful Garage Exhaust Fan with Damper, Potable Wall Mount Fan Fume Extractor Ventilation Fan for Shop, Shed, Basement, Chicken Coop, Silver"


Thoughts?
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  #2  
Old 2025-01-24, 9:26pm
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Eileen Eileen is offline
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Check the noise rating. And what size is your basement? Could you use a dimmer switch with it?
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  #3  
Old 2025-01-25, 8:29am
Solarbeam Solarbeam is offline
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I tried adding images and cannot yet, but my basement is 1100sqft, nearly twice as long as it is wide. And Im setting up at one end.

I found a different fan that has a variable speed controller. Claims 1130cfm, and 63dBa.
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Old 2025-01-25, 3:58pm
ESC ESC is offline
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As Eileen stated, the size of your basement determines the CFM of your fan. And keep in mind that if you use flexible ducting or any bends between your torch and the fan will reduce the amount of actual CFM. Better to go bigger and not need it than smaller and have to do it all over again.
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  #5  
Old 2025-01-27, 1:13pm
Solarbeam Solarbeam is offline
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So, if I have an 1100sqft basement, a 1130cfm fan, and I will have nearly zero duct work, I should be good?

I'm setting my table up in front of a window and the fan will be set up in that window to vent directly out. The door I can prop open for replacement air is going to be about 10 feet to the left of where I'm sitting, perpendicular exterior wall to the vent window.
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  #6  
Old 2025-01-27, 9:48pm
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And rigid ducting, not flex ducting, right? If so it looks like you'll have the minimum necessary for the average torch.
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  #7  
Old 2025-01-28, 3:29pm
Solarbeam Solarbeam is offline
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Quote:
Originally Posted by ESC View Post
And rigid ducting, not flex ducting, right? If so it looks like you'll have the minimum necessary for the average torch.
Cool, sounds like I should be good!
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  #8  
Old 2025-02-10, 8:06am
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bshelle bshelle is offline
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For basement studios, I would really go overboard with what you need. You didn't mention your torch, or what you are using for oxygen, or if you are fuming, etc. There's a lot of factors at play with ventilation and I think that small kitchen vent system is in adequate.

Here is what I purchased for my third floor (large area) set up. It's quiet (mostly) and I haven't needed to use it on full power. It was not cheap but it's worth every single penny. It's been cleaned up a bit since the photos below on my IG.

https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1

I added a large galvanized hood and attached with aluminum tape. I put two layers of fine metal mesh over the fan to keep hot particles out, and I have it placed directly in front of my torch and immediately venting out the window. I used one duct reducer to get to 8" and used a dryer vent system installed in the window.

Picture of it
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  #9  
Old 2025-02-10, 1:31pm
rcktscientist rcktscientist is offline
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Quote:
Originally Posted by ESC View Post
As Eileen stated, the size of your basement determines the CFM of your fan. And keep in mind that if you use flexible ducting or any bends between your torch and the fan will reduce the amount of actual CFM. Better to go bigger and not need it than smaller and have to do it all over again.
I'm going to politely disagree with the size of the room determining the CFM rating. That is not correct. The CFM of the fan will be determined by the flow required either at the operators work position or in the ducts themselves. That means the flow past my face is far more important than the size of the room I'm working in. Proper make-up air effectively nullifies the size of the room.

Ultimately, 100 fpm flow velocity is recommended for fuming so I use that as the benchmark and work backwards from there to size the fan considering all the ducts, bends, materials, etc. Not simple but certainly not black magic either.
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  #10  
Old 2025-02-10, 7:42pm
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Quote:
Originally Posted by rcktscientist View Post
I'm going to politely disagree with the size of the room determining the CFM rating. That is not correct. The CFM of the fan will be determined by the flow required either at the operators work position or in the ducts themselves. That means the flow past my face is far more important than the size of the room I'm working in. Proper make-up air effectively nullifies the size of the room.

Ultimately, 100 fpm flow velocity is recommended for fuming so I use that as the benchmark and work backwards from there to size the fan considering all the ducts, bends, materials, etc. Not simple but certainly not black magic either.
Quite right
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