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WhereWolf
Stranger
Registered: 07/27/22
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: sandman420]
#28126669 - 01/05/23 10:44 PM (1 year, 22 days ago) |
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"Gloveboxes create vortex type turbulence within an enclosed space, the frequency and amplitude of that turbulence is far greater than that of external air currents that interact with a standard SAB."
If you cut out 2 / 4" holes then MS tape or filter patch em, that should cover the turbulence?
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Greg
always learning




Registered: 10/28/15
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: WhereWolf] 1
#28126686 - 01/05/23 10:55 PM (1 year, 22 days ago) |
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No, that will not prevent turbulence. The filter itself will likely induce more turbulent motion.
Edited by Greg (01/06/23 05:18 AM)
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: WhereWolf] 1
#28126688 - 01/05/23 10:55 PM (1 year, 22 days ago) |
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No, juat don't use a glove box...a glove box with extra steps doesn't make it better.
Use a SAB
Like, did the OP lack some critical information that would lead one to believe that an electric air purifier with a bag taped to it, or a glove box with extra holes and micropore tape were theoretically sound designs?
Why use a simple still air box when you can add gloves and extra holes? Why? Why wouldn't you want to complicate it?
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PsillySeeEms
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Registered: 11/12/22
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Loc: PNW
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: WhereWolf]
#28126755 - 01/05/23 11:42 PM (1 year, 22 days ago) |
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"Shmuvboxes" don't create turbulence like all the other diy setups listed though. Unless you didn't build it properly I suppose. Didn't get a good seal around the bag or something, so it's sucking in non filtered air through the tape, just like a venturi.
IMO, the secret is in using the bag as the hood, with the arm slits, and vent hole towards one end. Also, having a true HEPA filter installed into it. Even if some cultivators were using the preinstalled 99% hepa "type" ones, and still getting good results. Get the purple performance 99.97 one.
The loose bag can basically expand or contract, and perfectly conform around the "flow" of filtered air, no matter what speed setting the fan is running on. As long as it's enough to inflate the bag, depending on the size of slits you cut.
Even if it's not perfect text book looking laminar flow (no proof exists that I've seen that it doesn't), but.. it's blowing the filtered air in a direct stream, right out and past your arms at all times anyway.
The bag itself acts like a cushion of sorts (unlike a solid box or SAB tub with fan, etc), absorbing any currents within that could possibly create those vortex like eddies.
It's hard to explain, because I could be full of shit, and also i'm no space ship scientist. But for real, at least build them instead of a modified SAB, or any of the other ways that are listed in this thread.
You never see decent results, or worthwhile updates on any ghetto box fan setups like the OP listed. Go ahead and find anyone saying a shmuvbox doesn't work though. I've heard many 100% success stories, otherwise I wouldn't tell you guys to make one. Read the comments in the youtube vids I linked too.
I'll post my results soon.
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ruawakeyet


Registered: 05/03/21
Posts: 1,862
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. *DELETED* [Re: PsillySeeEms] 1
#28126761 - 01/05/23 11:52 PM (1 year, 22 days ago) |
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Post deleted by ruawakeyet
Reason for deletion: Because I want to.
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schpat
psychesomadelic



Registered: 09/26/21
Posts: 1,039
Loc: South Africa
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: ruawakeyet] 2
#28126770 - 01/06/23 12:11 AM (1 year, 22 days ago) |
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That box is great for doing what it was meant for, reducing particles, but not creating a sterile environment.
I would love to see your smoke test in the shmuv, but I doubt it'll ever get posted. Prove me wrong.
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PsillySeeEms
Stranger


Registered: 11/12/22
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Loc: PNW
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: ruawakeyet]
#28126781 - 01/06/23 12:51 AM (1 year, 22 days ago) |
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Quote:
ruawakeyet said: Can you troll any harder?

I bought 2 holmes aer1 desktop units on sale for 39.99 each last week. Got the performance filter too.
I'm going to modify my unit\s, and add a duct flange. That I can zip tie or bungee the trash bags too it, instead of taping the bag on every time. My shmuvbox tek will be updated for the future, with all the bells and whistles.
I can sit between 2 portable tables, with 2 portable shmuvbox deluxe models on each side of me in a chair, each with a 50 gallon trash bag, in a dual configuration. 2 shmuvboxes running at once to hack time!
I can fit so many uncle b.. er, grain bags in each one, like 100 or something in each, and one arm G2G both of those bad mf'ers at the same time, with my eyes crossed, only needing one arm slit in each bag.
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PsillySeeEms
Stranger


Registered: 11/12/22
Posts: 431
Loc: PNW
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms]
#28126794 - 01/06/23 01:10 AM (1 year, 22 days ago) |
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I'll look into how to do a smoke test. All the vids I seen, when teaching about laminar flow, they have a tube pumping out some kind of vapor. I don't know what the device is, but guessing its just glycerin..
Can I just use an ecig mod or something?
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schpat
psychesomadelic



Registered: 09/26/21
Posts: 1,039
Loc: South Africa
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms] 2
#28126801 - 01/06/23 01:29 AM (1 year, 22 days ago) |
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a burning stick of incense will do fine
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PsillySeeEms
Stranger


Registered: 11/12/22
Posts: 431
Loc: PNW
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: schpat]
#28126818 - 01/06/23 02:22 AM (1 year, 22 days ago) |
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Ok. I can try lighting some incense or punks into it soon. Guessing I would mount the stick, and raise it up so far. Or move it around?
I'll even slap a brand new 20x20 inch box fan filter together, and test that with the smoke too. lol
The thing is, if I mess up and perform the tests poorly(never having done it before), it might put a bad name to it. Can you guys take vids of holding a smoking incense in front of your LFH too? So we can compare?
Wouldn't it be better to take my unit to someone professional, that has all the air quality meters and gadgets to do a proper test? Also, with a real laminar flow hood next to it to see the actual differences?
Or, you guys could just shell out the +/- $100 too, for a pack of clear trash bags, a holmes desktop unit, and a purple filter. See how it works for yourselves. Haha
https://www.target.com/p/holmes-aer1-desktop-hepa-air-purifier-with-visipure-filter-viewing-window/-/A-14919605
https://www.amazon.com/gp/product/B00DWHVE62/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&th=1
https://www.lowes.com/pd/Hefty-36-Pack-30-Gallon-Clear-Plastic-Recycling-Trash-Bag/1000987164 or https://www.amazon.com/BEISHIDA-Cleaner-Plastic-Transparent-Clothing/dp/B09NLHS4GP
Edited by PsillySeeEms (01/06/23 02:36 AM)
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms] 4
#28126886 - 01/06/23 05:56 AM (1 year, 22 days ago) |
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Listen man, go make a shmuv box thread if you want. You can blow your noob trumpet there and every memeber with less than 100 posts will shower you with praise for being a mycological revolutionary.
No need to hijack my thread.
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ruawakeyet


Registered: 05/03/21
Posts: 1,862
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. *DELETED* [Re: PsillySeeEms] 1
#28126888 - 01/06/23 06:01 AM (1 year, 22 days ago) |
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Post deleted by ruawakeyet
Reason for deletion: Because I want to.
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: ruawakeyet] 1
#28126889 - 01/06/23 06:05 AM (1 year, 22 days ago) |
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You know what works?
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SirPsycho
Purple Belt in Google-Fu



Registered: 01/01/20
Posts: 6,900
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms] 2
#28126890 - 01/06/23 06:05 AM (1 year, 22 days ago) |
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Quote:
PsillySeeEms said:
Or, you guys could just shell out the +/- $100 too, for a pack of clear trash bags, a holmes desktop unit, and a purple filter. See how it works for yourselves. Haha
Or I could spend a few bucks on a plastic box and know it works.
But if you show me a smoke test with your laminar bag I'll eat my shoe and suck your dick.
There's no "almost" laminar btw. It's a binary type thing. It's either laminar or it isn't. Like sterility, it's 0 or 1. True or false.
Also 10% contam is beyond horrible. Less than 1% is acceptable, at 3% you need to start asking questions, at 5% you need to re-evaluate your whole process
--------------------
Ask me about free Ps tampanesis, Ps subtropicalis and Ps cubensis (ESS) prints Balance in life is like running on ice.
🅑🅞🅣🅣🅛🅔 🅖🅐🅝🅖
    "Mist your balls and fan your asshole" - Pandaskis, 2023
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RockinRobot
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: SirPsycho] 2
#28126891 - 01/06/23 06:09 AM (1 year, 22 days ago) |
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I'm brand new and get less than 10% contam in my SAB. It only cost me $16
Edited by RockinRobot (01/06/23 06:16 AM)
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: RockinRobot] 1
#28126898 - 01/06/23 06:22 AM (1 year, 22 days ago) |
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I mean, just by understanding how laminar flow and turbulence works you can make an apriori judgment based soley upon theory.
There is no way that a shmuv box creates anything other than turbulence, there are no available mechanisms, no design feature that could produce laminar flow even by accident.
I encourage you to do your smoke test, although entirely unnecessary.
Why don't you see these devices in virology or microbiology labs? If theyrecheap reliable resources for microbial, viral, or fungal culturing then why hasn't anyone adopted them? Other than inexperienced noobs growing drugs? Why is that the case?
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PsillySeeEms
Stranger


Registered: 11/12/22
Posts: 431
Loc: PNW
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: Stipe-n Cap]
#28126900 - 01/06/23 06:25 AM (1 year, 22 days ago) |
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That's a nice little setup btw man. I could build one just like it 
The silicone mat looks like it protects from spills, or even hot tools if dropped (probably not good in a trash bag, lol), and can probably be rolled up and pressure cooked to sterilize it if you wanted. I like that, and might have to get one too.
I'll make another thread soon, and run those tests, so feel free to come troll my ass later if you guys want, haha.
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms] 1
#28126903 - 01/06/23 06:32 AM (1 year, 22 days ago) |
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They're quite easy to build. I have a thread that provides all of the necessary details, if you're interested:
https://www.shroomery.org/forums/showflat.php/Number/26679345
The dimensions of the filter are matched to the volumetric output and resistance of the blower; the filter is a HEPA designed for laminar flow; it's designed to organize the flow into lamina as a result of the filters internal geometry, it produces the appropriate velocity 100 fpm +/- 10 fpm. Very handy and portable.
Actual clean benches are calibrated for 90 fpm.
The silicone pad keeps my petri dishes from sliding around during transfers.
Edited by Stipe-n Cap (01/06/23 08:48 AM)
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outlier52
Stercus Caput



Registered: 02/17/22
Posts: 235
Loc: Zeta Reticuli
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: Stipe-n Cap] 1
#28127129 - 01/06/23 10:32 AM (1 year, 21 days ago) |
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Quote:
p9hu7 said: You know what works?

A wall-mounted land line?
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: outlier52] 2
#28127373 - 01/06/23 01:46 PM (1 year, 21 days ago) |
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My apartment used to be a hotel room
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