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Home Laboratory: DIY Exhausting Fan Models and Filters

MuricanSpirit

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You probably don't want to breath the byproducts of your process. This post describes some ways how to get rid of it.

Items:

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Those tubes are usually meant to blow/suck through. They don't suck/blow air from the sides as the "carbon filter ends" do.

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I wasn't able to find any photos of usage but imagine it like this:

Air gets blown from one direction into the bottle through water (afterwards the air can be sucked out or not).
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Combintations

You can use the sucking tube - where the air goes in - as exhausting. You can move the tube as close as possible to your reaction/evaporation.

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The only bad thing here is that a carbon filter end is used hence you need to move the whole filter close to the reaction. You could probably do it the opposite way: To blow into the carbon filter end so you will have a sucking tube at your working side (the byproducts would be blow through the fan into the carbon filter instead of sucked into).

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This would be my dream setup:
1. You have a "easy to work" tube at your end
2. The chems have to go through the carbon filter before they touch the fan (some chems aren't nice to tech).
3. There would be an additional water filter (you could basically add any liquid in there).

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Noise reduction tips:
All fans are louder without any tubes. Aluminium tubes make the most noises next to plastic. There are however isolated tubes as well, they recude the noise a little bit (same effect as stripping clothes around the tubes):

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You can use a plastic box and put your fan into it. Stuff it with clothes. This will reduce the noise significantly.
Those fans are basically just a fan with their own "isolation jacket". They are significantly more silent than usual fans (when the tubes are added).
Most fans spin as fast as they get power. If they get less power they rotate less fast hence reducing noises.
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Price reduction tips:

  1. Don't buy the items in overpriced cannabis grow shops (you end up paying up to 10x more). You can use any DIY shop (construction markets).
  2. Use carbon filters which allow you to replace the carbon (most of them allow you to replace the carbon anyway but those sold in cannabis grow shops are usually sealed).
  3. Dont buy "noise reduction tubes" or "silent fans", they work but if you have anyway clothes you don't need, it ends up cheaper just building your own "isolation box" for the fan and its cheaper to use tape the tubes with clothes to isolate the noises.
 
Last edited:

MrTortoise

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You may consider using potassium permanganate activated alumina as well.
 

HerrHaber

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HerrHaber

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I guess it depends on how heavily it's used. It works for me on a small scale, especially when I have to take care of the air that comes out. It has a surface area of ≥250m2/g which seems to be large enough.
MrTortoiselet's just hope no beginner ends up clogging that up when is most needed
 

Frit Buchner

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Thanks. I came to this particular forum to post a " let's talk about fune hoods" thread. I'm still going to, but you've given me a few things to think about. So, tell me what the benefits of a carbon filter are? I know they knock down the smell but don't we really need to be venting this air to the outside anyways? I see all of your pictures depict centrifugal inline fans. Is that the standard for any particular reason? I have a lot of other questions but I'll put them in the Post. I asked these on your post because they Are specific to what you showed . Your giant bong is a novel idea, but it seems like it would be terribly inefficient. Mostly these types of inline fans lose half of thier output by the time the resistance reaches 2" water gauge. Which is nothing compared to the resistance of your bong.
 
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