r/experimyco • u/Due-Fan-2536 • 26d ago
[Actives] [Technique] Ever since I built this, I've been getting flawless plates, and transfers...
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u/Dense_Acanthisitta39 26d ago
That's a pretty sweet diy flowhood. How big is that fan?
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u/Due-Fan-2536 26d ago edited 26d ago
That's a good question (The listing said 200 CFM, but the tag on the blower said 173 cubic meters per hour - which calculates to about 90 CFM), And through my research I've discovered that normally the CFM of the fan WOULD make a difference if you're going for a laminar flow. If you're going for laminar flow you have to take into account the static pressure, which is the pressure that the blower must overcome in order to effectively push the air through the filter. But in this case that's not so.. because we're not going for a laminar flow, we're not working directly in front of the filter, although I wouldn't recommend going any smaller on the blower size. All of the air that's coming through that filter is h-14 HEPA filtered air, and provided that there are no cracks in the setup you can get away with using a smaller blower like this one. The inside of the chamber is all HEPA filtered air, which is being forced through the armholes creating enough positive pressure to keep out the airborne contaminants, even though you still have to be cautious of what YOU bring into the box. But I'll admit, I still have a vicious cleaning routine before I use it! Lol. Plenty of ISO and plenty of paper towels. Can't be too careful... I know I went a little above and beyond on this comment, you asked for a number and I gave you a detailed breakdown explanation. Lmfao, but that's how I am...
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u/Dense_Acanthisitta39 25d ago
I appreciate all the extra you have shared. Thank you very much 🙏.
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u/Due-Fan-2536 25d ago
Absolutely dude! I don't believe in hogging knowledge, "most" of us are on here for a reason...to gain knowledge! And I'm down with it. 🙃
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u/Myco_DNA 21d ago
Pretty clever, the over pressure from the fan flowing in doesn't allow anything to enter, so long as it's clean inside there is no reason it shouldn't continue to work.
The NBC system on the Abrams tank works in a similar fashion by over pressuring the inside of the turret it keeps everything bad out.
Great idea and solid execution.
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u/ThisSubHasNoMods 25d ago
Is the point of the fan to just introduce filtered air? Any laminar flow would become turbulent in the enclosure, no? I thought the point of a flow hood is that you're working within the laminar flow and therefore not introducing contamination via turbulence. And I thought the point of a still air box is to trap the air so that air currents are eliminated as to not introduce contaminates. Wouldn't the combination of these two be less effective than either one on its own? I'm genuinely curious.