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Samurai_Jim
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Help me build a laminar flow hood please.
#7979510 - 02/04/08 07:44 PM (15 years, 11 months ago) |
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I searched a few older posts and have a basic idea of what to do. But can you all help put together a list of parts for a functional laminar flow hood? I have about $250 to get this done.
Please help
-SJ
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7979773 - 02/04/08 08:25 PM (15 years, 11 months ago) |
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If I used these filters: http://cgi.ebay.com/_W0QQitemZ320211547906QQrdZ1QQcmdZViewItem
And matched up a blower to them, woudl that work?
I would get 2 of those filters and have 48" of workspace.
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xhooliganx
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7979780 - 02/04/08 08:26 PM (15 years, 11 months ago) |
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this hepa filter seems to fit well in your budget http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=320211547906&ssPageName=STRK:MEWA:IT&ih=011
now it's rated at 99.97% at .03 microns. can anyone verify if that's a substantial filtering rate for a flow hood?
mdf board to build your box, ideally you want to find a blower that will match your filter. You're probably not going to find the data chart for a fan if you're buying it used.a 1/3-1/2 hp squirle cage blower should work(something that's overly powerfull that you can slow down to the proper pressure), a voltage controller to control the fan, a prefilter of some sort. various screws fasteners rtv kinda stuff. that should basicly be all you need. i'd suggest ohmatics flowhood post because it already has a schematic with measurements for aproximatly the same size filter
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xhooliganx
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Re: Help me build a laminar flow hood please. [Re: xhooliganx]
#7979794 - 02/04/08 08:29 PM (15 years, 11 months ago) |
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hmmm looks like you already found the filter I suggested while making my post.
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: xhooliganx]
#7979914 - 02/04/08 08:50 PM (15 years, 11 months ago) |
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Where is ohmatics post? I suck at math and would have the hardest time trying to figure out what fan to use. I'll probably just get the 1/2 hp and a voltage regulator and adjust it from there. I sent the guy and offer for two filters. From what I can tell, 99.97 will work and those filters have a static pressure of 1.4". So it should need a fan that would push about 875 cfm, from what I can tell.
I need help, bad.
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xhooliganx
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7979990 - 02/04/08 09:02 PM (15 years, 11 months ago) |
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http://www.shroomery.org/forums/showflat.php/Number/5569636#5569636
the measurements are metric just remember 25.4 mm to one inch. if you look at his last picture he redesigned it to be taller with the fan area above instead of behind that way would save a lot of space in your lab area.
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: xhooliganx]
#7979999 - 02/04/08 09:03 PM (15 years, 11 months ago) |
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Thanks.
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xhooliganx
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7980054 - 02/04/08 09:11 PM (15 years, 11 months ago) |
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oh and you don't need a fan that can just push 875 cfm. you need one that can push that much at 1.6" static pressure(giving you and extra .2" from the prefilter)
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: xhooliganx]
#7980274 - 02/04/08 09:44 PM (15 years, 11 months ago) |
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Yeah, I forgot to put that in there. Thank you though.
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RogerRabbit
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7980531 - 02/04/08 10:21 PM (15 years, 11 months ago) |
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Not quite. It says if you push 2,000 cubic feet per minute through the filter, it will develop 1.4" of static pressure in the plenum behind it. You want far less flow than that, so you'll be running at a lower static pressure. A blower rated at 500 cfm @ 1" static pressure will do the trick. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: RogerRabbit]
#7980562 - 02/04/08 10:26 PM (15 years, 11 months ago) |
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Thanks again RR.
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Anno
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7981331 - 02/05/08 01:58 AM (15 years, 11 months ago) |
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: Anno]
#7981519 - 02/05/08 06:13 AM (15 years, 11 months ago) |
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Thanks. Read that several times. That's actually where I got the link for the filter. Good info.
To diffuse the air, I saw something on mythbusters once, where they were making a wind tunnel. They took straws in boxes of 500"?" and cut them in half. THen they made a "wall" out of them and it made a relatively smooth flow of air. Would something like that help a cheaper hepa flow hood out?
-------------------- Decreasing the world's bug population, one faceshield at a time.
Edited by Samurai_Jim (02/05/08 06:15 AM)
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7981972 - 02/05/08 10:02 AM (15 years, 11 months ago) |
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I found a blower from granger that will push just a tad under 500cfm @ 1" for $199.25, or one that will push just a tad over 500cfm @ 1" for 217.00. I don't want to spend that much money, but they are at least new and under warranty. What do you all think?
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orchidfanatic
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7982101 - 02/05/08 10:38 AM (15 years, 11 months ago) |
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you might look on ebay I got a 500 CFM blower @ 1" SP for 70 bucks.. plus 20 shipping .. it was a steal ! but look for a new one not a used one .. good luck on it .. my flow hood is 24 x 24 x 11.5 and the blower works great .. I use a K&N filter to restrict and filter the incoming air ..good luck with your build
I remember that mythbusters episode.. with the straws that should work well to help even the flow going into the filter but it seems like alot of work and the results may not be worth the effort
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RogerRabbit
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7982245 - 02/05/08 11:17 AM (15 years, 11 months ago) |
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Quote:
Samurai_Jim said: I found a blower from granger that will push just a tad under 500cfm @ 1" for $199.25, or one that will push just a tad over 500cfm @ 1" for 217.00. I don't want to spend that much money, but they are at least new and under warranty. What do you all think?
The latter. You can always block part of the intake off to cut down on flow, but the increased capacity will be nice a few years from now as the filter starts to clog. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: RogerRabbit]
#7982678 - 02/05/08 01:22 PM (15 years, 11 months ago) |
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Well, the fellow accepted my offer for $25 each on those filters. $40 shipping though! Ouch! Next I am working on getting a blower. I called the local HVAC shop and they are seeing what they have that would push 500cfm @ 1". We'll see.
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xhooliganx
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7982750 - 02/05/08 01:36 PM (15 years, 11 months ago) |
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ok i'm just wondering what i'm missing. if he is running 2 of the filters side by side to have a 24"x48" work area wouldn't the 8 square feet surface area and the 100 fpm laminar flow make it roughly 800 cfm. I've read through the fungifun flowhood section a few times. i'm just a little lost here.
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Edited by xhooliganx (02/05/08 03:03 PM)
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: xhooliganx]
#7983433 - 02/05/08 05:08 PM (15 years, 11 months ago) |
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Quote:
xhooliganx said: ok i'm just wondering what i'm missing. if he is running 2 of the filters side by side to have a 24"x48" work area wouldn't the 8 square feet surface area and the 100 fpm laminar flow make it roughly 800 cfm. I've read through the fungifun flowhood section a few times. i'm just a little lost here.
I just read the article again also, it seems that I would need 800 cfm by that calculation......
Help please?
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orchidfanatic
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7983486 - 02/05/08 05:17 PM (15 years, 11 months ago) |
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I think 24x48 us way overkill but whatever floats your boat the specs on that filter say 1.4 resistance in W.G? whats that? you are going to need one helluva blower for both filters my blower is loud so yours is going to require hearing protection for long periods..
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xhooliganx
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Re: Help me build a laminar flow hood please. [Re: orchidfanatic]
#7983942 - 02/05/08 07:00 PM (15 years, 11 months ago) |
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on FP the 24x48 flowhood they sell is ran by a 1/3hp blower. They also sell a 1/2hp blower that they recomend for 24x48 flowhoods that they recomend to be used on the second highest setting. I dont think it should be that hard to find to find a decent used blower on ebay that will suit your use for under 100 shipped on ebay.
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: xhooliganx]
#7984071 - 02/05/08 07:25 PM (15 years, 11 months ago) |
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RogerRabbit
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7984647 - 02/05/08 09:18 PM (15 years, 11 months ago) |
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If the rating doesn't have an @ 1" or better, don't buy it no matter what. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: RogerRabbit]
#7984665 - 02/05/08 09:23 PM (15 years, 11 months ago) |
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RR,
I spoke with a fellow from Grainger today. The ratings only go up to .5" on a lot of their blowers. So he calculated that the two I posted about would work around 500cfm @ 1". Even though there was no rating for that ammount of SP, should I go on his word?
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RogerRabbit
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#7984691 - 02/05/08 09:29 PM (15 years, 11 months ago) |
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Graingers works with a lot of hvac people, so I'd give it a try if the price is right. There's no 'exact' amount of air the flowhood should put out, so you have wiggle room. You want the airflow to bend a cigarette lighter flame over between 45 and 90 degrees, but not even come close to blowing it out. If you get in that range, you're set. Be sure to have a plenum for air pressure to equalize(static pressure) behind the filter. Look at the plans on Anno's site for more details. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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ohmatic
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Re: Help me build a laminar flow hood please. [Re: RogerRabbit]
#7990616 - 02/07/08 06:15 AM (15 years, 11 months ago) |
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--------------------
MONOTUB tek HEATBOMB tek RIP #cultivation! ....can't associate? well FUCK U !
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Samurai_Jim
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Re: Help me build a laminar flow hood please. [Re: ohmatic]
#8058400 - 02/22/08 09:05 PM (15 years, 11 months ago) |
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I'm back,
I have planned on using the ecoplus 12" blower. It pushes 1060 CFM @ 0.0". It will be closer to 600 CFM @ 1". THis will be ok, right?
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orchidfanatic
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Re: Help me build a laminar flow hood please. [Re: Samurai_Jim]
#8059614 - 02/23/08 09:08 AM (15 years, 11 months ago) |
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there should be a spec sheet showing what CFM it puts out at different static pressures ..
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Anno
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Re: Help me build a laminar flow hood please. [Re: orchidfanatic]
#8196464 - 03/26/08 01:04 PM (15 years, 10 months ago) |
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Just letting you all know that I am now maintainig a list of all HEPA filters at eBay suitable for building a flowhood at http://www.fungifun.org/English/Flowhood#sources and also blowers at http://www.fungifun.org/English/EbayBlower
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Liquidkick
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Re: Help me build a laminar flow hood please. [Re: Anno]
#8207084 - 03/28/08 04:16 PM (15 years, 9 months ago) |
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Maybe someone should build flowhoods for cheap and market it?
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FooMan



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Re: Help me build a laminar flow hood please. [Re: Liquidkick]
#8208353 - 03/28/08 09:23 PM (15 years, 9 months ago) |
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Quote:
Liquidkick said: Maybe someone should build flowhoods for cheap and market it?
They would make a killing.
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fastfred
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Re: Help me build a laminar flow hood please. [Re: FooMan]
#8209105 - 03/29/08 01:39 AM (15 years, 9 months ago) |
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I've made cheapies before. They can be made cheap if you're willing to settle for non-laminar flow.
-FF
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ohmatic
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Re: Help me build a laminar flow hood please. [Re: fastfred]
#8209305 - 03/29/08 05:06 AM (15 years, 9 months ago) |
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Quote:
FooManShroom said:
Quote:
Liquidkick said: Maybe someone should build flowhoods for cheap and market it?
They would make a killing.
Quote:
fastfred said: I've made cheapies before. They can be made cheap if you're willing to settle for non-laminar flow.
-FF
non-laminar flow would be non-useful. as anything non-laminar will create turbulences and therefor be a contam hazard.
STILL AIR gloveboxes are a very good cheap alterntive.
--------------------
MONOTUB tek HEATBOMB tek RIP #cultivation! ....can't associate? well FUCK U !
Edited by ohmatic (03/29/08 05:07 AM)
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fastfred
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Re: Help me build a laminar flow hood please. [Re: ohmatic]
#8225159 - 04/01/08 04:46 PM (15 years, 9 months ago) |
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Quote:
non-laminar flow would be non-useful. as anything non-laminar will create turbulences and therefor be a contam hazard.
Lots of flow hoods and transfer stations are made non-laminar. If you have sides and a sliding front with good airflow it works just fine. The airflow has to be somewhat smooth across the outlet and high enough velocity that nothing can be sucked inside and swirled around.
Sometimes they call them transfer stations or clean benches.
Here is an example that is similar to one I made once...
  
Others...
 
Read the threads... http://www.shroomery.org/forums/showflat.php/Number/3001117 http://www.shroomery.org/forums/showflat.php/Number/5748851 http://www.shroomery.org/forums/showflat.php/Number/6623013
Lot's of discussion there. Not everyone here agrees that non-laminar hoods work well, but they are in use in labs and are made by big scientific supply places. I know from experience that they can be made and will work if you do it right.
The key things in the top design is to make sure that you seal up whatever cheapie HEPA that you buy to eliminate blow-by. Some designs are easier to seal up than others. All the ones I've seen look like they have some blow-by, but the one pictured can be sealed up with a little work. I suggest cutting a hole and gluing your HEPA filter right into the opening. Also make sure that your opening is small enough that you have good airflow that is fast enough so that no part of the opening is sucking air back in.
Some cheap hepa filters that the units use don't look like they are sealed up that well and may have some blow-by themselves. I have found that the Holmes HAPF600CS filters are not sealed well and look like they will have some blow-by. OTOH the Holmes HAPF30 seems well sealed and I have used those with success. The HAPF30 has an interesting clip system, so you can use the clip to joint multiple filters together for larger area. Just put the filters face down and jam the clip down onto the tabs. Then tape the gap at the end of the seam and use hotglue, caulk, or whatever to seal up that gap. So you can make a filter as large as you need.
A flow hood I made a long time ago with 4 HAPF30 filters worked great. I left two PDA dishes out in the hood for about 30 minutes while working and I got one fungal contam colony on one of the plates. That is about as good as you can expect using 99.97% filters and is plenty good for mycological work.
-FF
-------------------- It drinks the alcohol and abstains from the weed or else it gets the hose again. -Chemy The difference between the substances doesn't matter. This is a war on consciousness, on our right to the very essence of what we are. With no control over that, we have no need to speak of freedom or a free society. -fireseed "If we are going to have a war on marijuana, the least we can do is pull the sick and the dying off the battlefield." -Neal Levine (MPP) I find the whole "my drug should be legal but yours should be illegal" mindset disgusting and hypocritical. It's what George Bush and company do when they drink a cocktail and debate the best way to imprison marijuana users. -Diploid
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em_bre_O
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Re: Help me build a laminar flow hood please. [Re: fastfred]
#8348487 - 05/01/08 03:17 AM (15 years, 8 months ago) |
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good god, that is the gayest thing I have seen in 17 months
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