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InvisiblePsillySeeEms
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: n3oX]
    #28049000 - 11/13/22 02:45 PM (1 year, 2 months ago)




So what do you guys think of this low tech design? Not with a turbulent makeshift storage bin hood attached, like other destop hepa flow hood designs I've seen, but instead using a dry clean bag as the hood like the guy in the video does.

Glad it hasn't been mentioned here, because I am currently working on a similar design, using 72" dry clean garment bags, and the same size hepa filters. Should be ready to test soon as I get the bags, and built my own housing for the filter, instead of using the holmes aer1 desktop unit mentioned.

I've seen reports with side by side agar dish tests on other sites I won't mention, and no contams.. but only when done inside the flow bag with this method. Hearing many other comments that it works great too.

Using the dry clean bags as the hood (which shrinks or expands in size accordingly to the flow) makes it impossible to have turbulence afaik. You  will have true laminar flow inside the bag, no matter what CFMs the fan is blowing through the HEPA filter at (just not too much, or too little..), right?

Anyway, I haven't seen anyone that says it didn't work yet, but like to hear your guys critique.

I'm a total newb, but I really don't wanna mess around with a SAB, when its looking like anyone can simply tape a clear dry clean bag to a super affordable portable hepa filter unit, and have a flow hood that apparently works better than anything else i've seen, especially some of the contraptions mentioned in this thread.


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: Stipe-n Cap]
    #28049043 - 11/13/22 03:07 PM (1 year, 2 months ago)

Gotcha,Thanks!


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: Stipe-n Cap]
    #28049188 - 11/13/22 04:16 PM (1 year, 2 months ago)

I dunno. Now that I know it's old tek called a shmuv box, and spent the last hour reading even more success stories (many from trusted cultivators here on this site, with even more ghetto looking trash bag setups than the video I posted above, lol), i'm even more inclined to finish my random build. 

Also, to go ahead and build a nice SAB as well :wink:


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: Stipe-n Cap]
    #28049217 - 11/13/22 04:26 PM (1 year, 2 months ago)

I'm trying, but its hard. I must complicate things! Your right though. Wish me luck! :thumbup:


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: Stipe-n Cap]
    #28049269 - 11/13/22 04:49 PM (1 year, 2 months ago)

My man, appreciate it!

I just know as soon as the bag fills up with air, i'm gonna light up like an unspoiled kid getting a big bouncy house for their birthday.


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: Drmbanana]
    #28126276 - 01/05/23 05:41 PM (1 year, 22 days ago)

Box fan filters are awesome. Especially the corsi-rosenthal style setups, with 5x the surface area. They work great to keep the dust down in your house, and filter the majority of the particles from the air.

I even throw them in my cannabis grow rooms, so other people aren't smoking my dead skin and hairs, etc. If your to cheap to filter your cannabis with $5-10 furnace filters, I don't want to smoke your pubes either, just saying..

I wouldn't even run a HEPA filter of any kind unless I was using cheaper furnace filters as well in the same space, and as a pre-filter at least to keep the HEPA itself from clogging up too fast.

That being said, I wouldn't try to use one like a flow hood for mycology, lol.

The only makeshift thing I would use besides a real ffu, flowhood or SAB is a shmuvbox, with an upgraded 99.97 performance filter and built in ionizer. The holmes aer1 units with the purple filter is what I recommended.

The garbage or dry cleaning bag you work out of forces the air inside to not be turbulent, and closer to real laminar flow. It just works.

I'll post a smoke flow and agar soon, as I'm building a few different versions of shmuvs right now.

Its also the only setup that the trusted cultivators here won't outright say doesn't work, because they secretly all know it does, with just about as good of results as a true flow hood or SAB.. Haha.

You can't deny the lack of reports saying it doesn't work over the last few decades.. I agree with ghetto box fan hoods not working as good, but I dare anyone to bet a shmuvbox doesn't work..







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InvisiblePsillySeeEms
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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)

"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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InvisiblePsillySeeEms
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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)

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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InvisiblePsillySeeEms
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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)

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? :stoned:


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InvisiblePsillySeeEms
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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)

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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InvisiblePsillySeeEms
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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)

That's a nice little setup btw man. I could build one just like it :wink: :wink:

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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InvisiblePsillySeeEms
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: Stipe-n Cap]
    #28131611 - 01/09/23 12:07 AM (1 year, 19 days ago)

Laminar flow is so easy to achieve with a plastic bag that even kids can do it. :crazy2:

How come sometimes I see people using plastic mushroom grain bags, and its like they want the air from the flow hood to inflate it. They literally hold it up so that filtered laminar air enters the bag. Obviously its creating turbulence inside the bag of sterile grains, so why don't they contam?

How is that any different than working inside an inflated shmuvbox bag?


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms]
    #28131620 - 01/09/23 12:27 AM (1 year, 19 days ago)

I realize the filter inside an air purifier (even the 99.99 HEPA rated one in mine) isn't designed that way, to create that flow.

Maybe it could be.. if you cut up a bunch of straws, or small tubes, and made a grill full of them, stacked together on both sides of the pleated filter material of the HEPA. That would force the air to become more streamlined, but for only so far, just like a real laminar filter... That's the only thing special about them right? The way the air inlet and outlet air holes are designed?

I'm not gonna do any of that (maybe though, sounds like another fun project!), because I know a bag inflated with a good filter will give me a very decent success rate.

I don't know if it's gonna cause the incense smoke to billow around and fill the bag, or exit the arm and vent slits in the bag in a streamlined laminar manner yet either, but I will in the next few days :wink:


Oh ya, receipts for how to make laminar flow with a bag, haha:



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InvisiblePsillySeeEms
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: Stipe-n Cap]
    #28131994 - 01/09/23 10:21 AM (1 year, 18 days ago)

Appreciate the detailed answers. I swear I'm not trolling. I'm legit convinced the trash bag flow hood boxes i'm modifying are going to work fine. It's hard to convince someone as stubborn as me when know what I know, lol. If it fails, I will be sure to build a real flow hood, and let everyone know why.  I'll show proof of the contams.. if there are any. Just waiting on my agar powder to show up in the mail.

I didn't want to start a shmuvbox thread until I get my unit finalized, with  some solid proof of clean test plates being ran in it. I almost don't want to at all, but I will if you guys think I should, haha. I'm going to be very thorough, and even seal the inside of the plastic housing and the filter, just like you would on any real DIY setup. Even the buttons and the cord. The blower actually pulls through this model, to keep the internals clean i'm sure. Maybe I could simply reverse the flow, and work from the actual filter side...

Either way, It will have a pre-filter protecting the HEPA filter. Even a fan speed controller, to dial it in just right, if it works that is.

Anyway, I'll try and do a quick video test with just a bag taped on ASAP, to show how the smoke flows, maybe later tonight. Do you guys think the bag will just turbulently fill up with solid white smoke?

Or, will there be a steady non laminar looking stream coming from the source, going right out past the arm holes, but not back towards the inlet to the bag?  :wink:


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms]
    #28132021 - 01/09/23 10:37 AM (1 year, 18 days ago)

Oh ya, and I opened up one of my aer1 desktop boxes I got for 39.99 @ target (it was an earlier revision from 2019) and low and behold, it had the expensive $35-40 purple 99.99 plus true hepa filter already installed! The box even shows the cheap hepa type blue filter and only says 99%. What kind of awesome false advertising is that?

I took the purple filter I bought (almost as much as the actual unit) and got my money back. So, 40 bucks for a unit that will deliver 99.99 sterile air by adding some ductape and a trash bag. Faster than you can saw 2 holes in a tub, and way easier to work in i'm sure..

OK i'll just start my own thread, sheesh....


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: Stipe-n Cap]
    #28163136 - 01/29/23 03:55 PM (11 months, 22 days ago)

Did they ever create a hood of some sort, with a static energy generator to suck the particles away, just like a balloon charged with electricity would pick up your hair or the dust off the floor?




EDIT: Just now looking into it.. so it appears static electricity is actually a plague to a sterile work environment. It can be problematic, and so there are even devices made to eliminate it from happening..


Edited by PsillySeeEms (01/29/23 04:09 PM)


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InvisiblePsillySeeEms
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: ruawakeyet]
    #28163173 - 01/29/23 04:20 PM (11 months, 22 days ago)

Quote:

ruawakeyet said:
Maybe boxfan blowhoods "work" because of the electrostatically charged furnace filters. The packaging doesn't explain what energy source is provided for the electrostatic charge though. I guess it's magic. :lol: (This should all be read with extreme sarcasm.)






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InvisiblePsillySeeEms
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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: PsillySeeEms]
    #28163186 - 01/29/23 04:30 PM (11 months, 22 days ago)

My shmow hood does have a magical ionizer built in. :wink:


I do wonder though, if some people have trouble with static electricity.. not just working with a flow hood, but even in a SAB too. Imagine, you walk across the carpet to your SAB work area, dragging your feet the whole way, without even thinking about it. Then you grab a container to put inside, and it becomes charged too, sucking particles directly towards it. Something like that anyway. I guess I'll have to study all about it now, as I'm very curious about it all.


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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: SirPsycho] * 1
    #28163429 - 01/29/23 07:35 PM (11 months, 22 days ago)





Oh shit you built it, does that mean we finally get that demonstration thread you promised a month ago or are you just gonna go on with your lecture?




Oh shnap, you mean the Shmuvbox DLX 1.0 prototype that I built, that I was supposed to do a shmoke test or something? The one I've designed to be mounted right under the table, or even on the wall overhead, with extendable\retractable down spout that can be flexed into holding just about any position you want your flow bag to be? The one that has a true 99.99 HEPA filter, with all the gaps of the pleated filter material sealed off with glue, unlike most the other air purifier filters people tried using?

This one?








Yes, I'll set it up soon and run the tests for you guys. I'm already convinced i'll grow 2 fuck tons of mush though.. :P


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Re: Box fan flowhoods, glove boxes, Positive pressure boxes. [Re: SirPsycho]
    #28163475 - 01/29/23 08:11 PM (11 months, 22 days ago)

I might even turbo charge it, along with cold air intake prefilter. Then I can ad Y-adapters to the output, and inflate like 6 bags at one time with all the extra horse power.

I can do a lot of work in 6 bags, without having to bring things in and out. 6 shmuck tons of mush sounds more like it!



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