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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Laminar flow hood. Blood, sweat, and tears edition...can taste the clean air.
#26559169 - 03/26/20 01:08 PM (3 years, 9 months ago) |
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I've spent the last 3 days wrapping my mind around every end of building a flow hood. Im having difficulty finding filters that are not all 11.5 thick on ebay. Ebay is a wrap for anything the correct thickness but there is a filter that test at .81 wg at 1000cfm test flow, that specific statistic still has me slightly confused in its relevance. Theres also other fat boys with higher wg's if needed. But im really just trying to get a proper width hepa. Im shooting for 24x24 but im willing to take about anything at this point. There is a possi le good deal on a lab grade unit on ebay but its hard telling where that filters life is at regardless of it being "serviced" if anyone can point me in the best path tward mycology related hepa filters I would be greatly in your debt. I plan on just getting the big dayton and not messing around, speed control and bog down of need be. If anyone has solutions it's greatly appreciated.
Edited by Grungeman17 (04/26/20 09:43 AM)
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POWAtrippin
Decidedly Undecided.



Registered: 10/22/08
Posts: 2,207
Loc: zone 9b
Last seen: 1 month, 19 days
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26559205 - 03/26/20 01:34 PM (3 years, 9 months ago) |
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Have you thought about repurposing a overhead lab unit?
They aren't nearly as deep, and can be found for a couple 100 dollars... Thats with housing, a fan, and no prefilter
-------------------- Don't believe everything you think. TRADE LIST ‹Sell Your Soul› You know this place is owned and operated by the Illuminati, right? ‹lsdwithme› i possibly just smoked a rat turd
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Zoltanvinegar
Road dog

Registered: 12/18/18
Posts: 81
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26559208 - 03/26/20 01:36 PM (3 years, 9 months ago) |
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Astrocell do 6in depth filters in a variety of sizes.
Not cheap but lurrvverllyyy You can see it sat alongside my 24x24x12
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Zoltanvinegar]
#26559285 - 03/26/20 02:30 PM (3 years, 9 months ago) |
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Theres a few differnt choices I have in 24x24x12 on ebay quick shipment but it is going to require a large plenum. I am constructing it to the T for actual laminar flow if i'm spending the money. What matters is the pressure drop rating of the filter. Of heard alot of differnt things about overhead fan clean room box units. Ive heard they work, ive heard its not real laminar flow. Im getting close to contacting FP and going through them. But im trying to wrap my head around the "test flow statistics" what does it mean? Some of the fat boys are rated for 2000cfm some less. I could choose .81, 1.0, 1.35, 1.50, in wg (pressure drop, static pressure, ect..) from a few differnt fat boys on ebay So my questions ironed out to the laminar is which pressure drop would you choose from the fat boy ebay list. The .81 was tested at 1000cfm .003% penitration the 1.0 was was test ed at 1150. And on up the scale. How do these test flow stats effect what we want. From my knowledge 4 square feet you want 500cfm pushing through to get the 100fpm+ laminar mark after restrictions.
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Zoltanvinegar
Road dog

Registered: 12/18/18
Posts: 81
Last seen: 25 days, 7 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26559551 - 03/26/20 04:34 PM (3 years, 9 months ago) |
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The plenum must just be the same size as your filter in depth so your quick shipping eBay will be a 2ft cube, this is too big for you? What helped me was to stop thinking too much into it, chances are you’ll buy a fan stronger than needed and have to chock it back with pre filters any way. The .81 1. 1.5 water gauge/static pressure is just the resistance the pleats place on the airflow, different filter pleats/size and quality all affect this number. Which one you should chose is purely dependant on your fans power capabilities, however like I said chances are you’re gonna get a fan more powerful than needed and have to use a prefilter. I use a Dayton 1tdu2 for each of my hoods. Excessive I know but I bought them at different times. This fan is the mutts nutts and on its own it can blow my toupee off from a distance, prefilters save my this embarrassment in the lab and extend the life of my big filters., And yes in order to push 100cfm through your 24x24x12 you will need 500cfm minimum.
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tramalot
Stranger


Registered: 12/13/19
Posts: 199
Loc: USA
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Zoltanvinegar]
#26559721 - 03/26/20 05:58 PM (3 years, 9 months ago) |
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Search Amazon, I seen what we need in 24x24 for sub $200. The technology has changed, a filter as thin as 1 inch are now produced (thank semiconductor ind)
Terms, HEPA MERV Flow Hood & clean room
-------------------- It's the Journey I enjoy!
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: tramalot]
#26560770 - 03/27/20 09:12 AM (3 years, 9 months ago) |
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6" astrocels just popped up on ebay. 215.00 or best offer. Free shipping. But to go with it..
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26572785 - 04/02/20 08:23 AM (3 years, 9 months ago) |
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UPDATE: THESE, are the filters I ended up finding. I offered 50 a piece for 2 and the seller accepted. All math had to be converted over but after searching tirelessly based on exact specifics on true laminar flow. These all metal 13.75 x 14.5 were it. It comes out to 2.78 sq ft. Kind of an oddball cfm range that im finding, I figure I want to push 350-400 cfm @ 1.2 and choke it from there. If need be Expert guidance would be nice here if anyone is around and willing. But from research in here against these calculations it seems to be exact on the numbers. Im trying to find a good blower in this range. This shit isnt easy and is time consuming but obviously has to be very rewarding if you come out with a stellar final product. Thats whag feeling im aiming for. I wish these builds could be streamlined, the technology is elementary just with mathmatical curves to learn. This project has also made me consider hepa filteration for my house and family as a whole. I spent a good portion of time now underatnading all of this and I hope to show something for it. Theres one of these filters left by the way if you with the ebay auction info, he will likely accept your 50.00 14.5x13.75 aint the biggest thats why im going double wide but theres one left and 50.00 plus like 20 to ship with garenteed specs. Is a good in for someone out there. Help me find this blower, I gonna post this build.
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26573416 - 04/02/20 02:20 PM (3 years, 9 months ago) |
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MOAR UPDATE: This is what I found. Today was my day of luck. The items I ordered today are not far away like both litterally in my home state, I'm pretty much buying local off the internet. This blower is 100 shipped. This company stresses on their home page providing this fan curve data sheet, and talks about how important it is and how misleading other big high cfm rated blowers truely perform. The fact I was able to find a company that appreciates displaying this needed data, and being of very close knowing these items will be here soon, its a wrap, i had a belt drive blower i was getting ready to over haul with new pullys or wheel now wont have to be done. It does appear the stars aligned for laminar flow from this projected setup. I hope these centrifugal blowers are the shit. Lite weight, hold up to.pressure. got variety of fan curves. GOOD price. So far. We are at 234.00 between the filters and the purchased blower. Went with the 6" blower.
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Edited by Grungeman17 (04/02/20 02:32 PM)
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starbones
I'm an alien, I eat uranium.


Registered: 03/04/20
Posts: 1,131
Last seen: 2 months, 17 days
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: tramalot]
#26573436 - 04/02/20 02:34 PM (3 years, 9 months ago) |
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Quote:
tramalot said: Search Amazon, I seen what we need in 24x24 for sub $200. The technology has changed, a filter as thin as 1 inch are now produced (thank semiconductor ind)
Terms, HEPA MERV Flow Hood & clean room
This doesn't seem correct, are you sure? Could you link an example of these 1" filters?
-------------------- Listen, I'm steel fisted with the iron lung Heavy metal ballads out the guitar where lions run.
 
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: starbones]
#26573489 - 04/02/20 03:02 PM (3 years, 9 months ago) |
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Not saying theres not some newer 2020 shit out.on the market but a 1" filter has never been used to build a flow hood on this site or common place period. It becomes very evidemt that a host of profit seeking terminology was applied to the industry as a whole. When it's alot more simple than lab equipment manufacturers want people and businesses to believe. The information on laminar flow systems are not straight forward. It is only at the upper level research of some of the pioneers of growing on this site that have been able to find and publish credible info on laminar flow hoods.
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Edited by Grungeman17 (04/02/20 03:05 PM)
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26581827 - 04/06/20 02:07 PM (3 years, 9 months ago) |
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Mo update: All stuff has made it! It's a sunny day, jammin a local rock station quarantine flow hood build. Your looking @ 3/4 birch veneer for material im not bothering with giving you guys deminsions for your gonna have to base that off your filter. Have the filter up right and clamped jbwelded together. I hope this blower rocks! It was a 100 bucks straight up manufactured in my region. Fast shipping. Anyway if this blower does what it says it will work through pressure nicely and better than other types of units. They stress it hard in the pitch on these units which I like. This could be the streamline blower for everone here at the shroomery. This was the smallest model @ 100.00 shipped. It goes all the way up. So it looks like you could scale no brainer, infos on front st. If this blower works and holds up. Good bye to people trying to buy and match big bulky daytons, messin with speed controllers, all the nonsense could be put to the test right here. Its a flying saucer of a blower and it is big in person. Im happy as fuck today. Taking close precise cuts and measurements. Big hole is being achieved by a cumpous style set up with my router. More to come
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26596392 - 04/12/20 06:39 PM (3 years, 9 months ago) |
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 Haven't had very much time to work on this unfortunately, my wife is in the medical field and i've been on dad duty extra this last week. The 2 boards with redone edges are fuck ups by me or failed atempts at straight cuts because of lack of tooling for my table and circular saw. Leading my attempts at a straight cut with a jigsaw that literally didn't cut it. But by grace, I have serval trim pieces of various sizes laying around so I was able to fix these mess ups well. I've compiled an essential item list, (blower and filter not included) with short explainations as well as some items and essential processes so far to this point for the build. My woodworking skill is 5/10. So some of these are hopefully going to help beginners. Anyone advanced should be able to do it blindfolded.
Ess. Items 1. Gorillia glue. (wood glue) cheaper and strong forgiving
2.corner clamp. This is going to save you from fuck ups all over the place. Via handling and adjointing this is a 15 dollar expense and can be self fashioned but not without tools and know how.
3.DAP PLASTIC WOOD. I'm in love. The shit is very workable and cleanable apply with gloved finger, this was a game changer sandable, sealable, fills cracks like no other. $7.50 6oz. $4.00 3oz.
4.Oil based polyurethane finish. $11.99 brissled brush you could go with waterbased but its 20bucks and overkill imo, OBP will hold up to 70% rubbing alcohol as long as you dont bath it. It makes your wood pop. So many unfinshed flowhoods. Oh and fuck paint.
5. misc tools. Best for the job, cutting large boards... circular handsaw with track or homemade fence. I wish I would have started there. Get a big L or T square you need one. Stay away from edges and corners if you decide to power sander. I prefer by hand. Get to know your wood.
Thoughts.
Have your wood precut from the lumber yard 1-2 inches more than you need for each deminsion dont trust them past that. Use 3/4 or 1/2 birch. Its worth it. If your skill level is above mine disregard this advice, if your are a beginner, when cutting, measuring, order of operations. Cut the bottom board that the hepa will be sitting on FIRST, take all future markings and deminsions off that piece. You will at the very least cover your hepa. The squareness of your box and uniform deminsions for part sets being secondary. If your limited tools or math skills. Just build and cut the box around your hepa accordingly. I glued 2 hepas together so I dealt with a runout that got addresses when I fixed one of my edges anyway. So no matter what I was altering the top piece deminsion. Some 2x4s ajointed in a square formation with your Corner clamper screwed to one corner make for a nice box maker.
The next update will be the final unvailing. I need to draw a decisive conclusion on this blower. It could be the way to ho for everyone here for their power, price, and outlining of the data. As well as discussing how im about to cut this here hole. And weather you want a perfect circle and less sealant or a jigsaw job and have to fashion some form of rubber fitting. Fuckin circles.
Anythings better than a sqaure...
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26629365 - 04/26/20 09:59 AM (3 years, 8 months ago) |
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 Here it is... almost done, drying and waiting assembly. I am not an experienced wood finisher. Oil based poly is not for beginners or at least someone who is just trying to hurry and finish. It wont serve you... going back I would have sprayed it with lacquer. I started getting happy with the torch and ended up with moutains and a moon. Was going for my sig... anywell... obviously its still gotta be assembled and tested but this is pretty much the final product. I made a dual mesh screen for the front of it from 2 differnt metals and colors that should make it look tough. The directions of this thing changed alot not knowing exactly what I was gonna do for mobility, but it became inherent as the weight of it started getting to me moving it around all the time. I wish I was better with finishing, that will.come with time, this entire build has prompted me to start possibly building smaller air purifiers for households with differnt art or litchenberg designs once my budddy gets the microwave motor all rigged up. Anyhoot I hope ya like it.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: starbones]
#26629455 - 04/26/20 10:37 AM (3 years, 8 months ago) |
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Quote:
starbones said:
Quote:
tramalot said: Search Amazon, I seen what we need in 24x24 for sub $200. The technology has changed, a filter as thin as 1 inch are now produced (thank semiconductor ind)
Terms, HEPA MERV Flow Hood & clean room
This doesn't seem correct, are you sure? Could you link an example of these 1" filters?
Well 2" is the thinnest ive seen but still pretty close
https://www.aafintl.com/en/commercial/browse-products/commercial/hepa-ulpa-filters/dimplepleat
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: bodhisatta]
#26629505 - 04/26/20 11:00 AM (3 years, 8 months ago) |
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The data out on air filtration and laminar flow here outdated. You can garentee get away with a thinner filter than 6in but for laminar flow i would go below a 4 inch filter. Theres alot of ffu's being used as flow hoods. That were intentionally designed for positive pressure systems and people are still getting a clean work space. If you use one of these things in a small enough space its gonna do something. Im generally excited to make another air purifier. I have to thick ass fram filters and 2 charcoal filters ready to stack up and make me up a new box. The ap is just for the general house and clean air for my daughter. It will be significanyly smaller. Like the size of my top box. Im getting into air filtration over this ordeal.
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deadmandave
Slime


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Loc:
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: bodhisatta]
#26629560 - 04/26/20 11:18 AM (3 years, 8 months ago) |
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>https://www.aafintl.com/en/commercial/browse-products/commercial/hepa-ulpa-filters/dimplepleat
Those are sweet filters. Looks like they have a lower resistance as than the 6", so smaller fan sizes could work.
I think as long as the hood has a ~8" plenum you should be able to achieve laminar flow.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: deadmandave]
#26629579 - 04/26/20 11:23 AM (3 years, 8 months ago) |
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Those filters go in FFUs with little to no plenums
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Grungeman17


Registered: 05/06/09
Posts: 1,436
Loc: usa
Last seen: 1 day, 2 hours
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: bodhisatta]
#26629636 - 04/26/20 11:44 AM (3 years, 8 months ago) |
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Yea, see...thats what I dont like. I had a straight up TC come in and correct me...and tell me there are special baffles on the backside of those ffus that distrubute the air flow properly with out proper plenum spacing... swore up and down about. But if you go on youtube and check out fresh cap mushrooms...the guy is legit as fuck and teaches people alot. He runs both systems. The ffu for the positive preasure of the overall room and LF for the work space. I sorda fall in line with that theory. I dont trust anything that doeant have a proper plenum to build the laminar flow.
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Seriously need help finding a hepa filter. (Done my research) [Re: Grungeman17]
#26629644 - 04/26/20 11:47 AM (3 years, 8 months ago) |
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Its simple enough to test the flow with a tool as simple as a lighter. Flow hoods are pretty simple
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