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OfflineCitizenErased
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DIY Flow Hood from Instructables
    #20573635 - 09/16/14 12:30 AM (10 years, 4 months ago)


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Offlinepawnzy
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Re: DIY Flow Hood from Instructables [Re: CitizenErased]
    #20574019 - 09/16/14 05:40 AM (10 years, 4 months ago)

idk but i love that website haha

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OfflineMonkeyJesusFresco
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Re: DIY Flow Hood from Instructables [Re: pawnzy]
    #20574239 - 09/16/14 07:56 AM (10 years, 4 months ago)

To answer your question, No. not efficiently, if at all. You could save so much time/money and a good vaccume cleaner just building a SAB with more efficiency than that thing in the instructable; the size of it look's comparable to a few temporary-SABs I've had before.

I'm in the "I want a flow hood!" camp too; It sucks blows; I've read through everything, crunched some numbers and, I hate to do it, being a natural born half-ass myself, but... it looks like a properly built flow hood is the way to go, economically :shrug:

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Offlinepawnzy
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Re: DIY Flow Hood from Instructables [Re: MonkeyJesusFresco]
    #20574340 - 09/16/14 08:32 AM (10 years, 4 months ago)

if anything a SAB is more economical, less cost, less know how, less work.

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OfflineMonkeyJesusFresco
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Re: DIY Flow Hood from Instructables [Re: pawnzy]
    #20574401 - 09/16/14 08:49 AM (10 years, 4 months ago)

Quote:

pawnzy said:
if anything a SAB is more economical, less cost, less know how, less work.




depends on your work-load :shrug:

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OfflineSockadin
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Re: DIY Flow Hood from Instructables [Re: MonkeyJesusFresco]
    #20574457 - 09/16/14 09:07 AM (10 years, 4 months ago)

This isn't laminar.

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OfflineMonkeyJesusFresco
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Re: DIY Flow Hood from Instructables [Re: Sockadin]
    #20574498 - 09/16/14 09:20 AM (10 years, 4 months ago)

or appropriately filtered air...

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Offlinepawnzy
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Re: DIY Flow Hood from Instructables [Re: MonkeyJesusFresco]
    #20574799 - 09/16/14 10:49 AM (10 years, 4 months ago)

Quote:

MonkeyJesusFresco said:
Quote:

pawnzy said:
if anything a SAB is more economical, less cost, less know how, less work.




depends on your work-load :shrug:




This is very true.

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OfflineCitizenErased
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Re: DIY Flow Hood from Instructables [Re: pawnzy]
    #20598570 - 09/21/14 07:38 PM (10 years, 3 months ago)

Yeah. I have a SAB. I've had more problems than I expected. While we're on the subject,is there any reason the hepa filters used in some vacuums wouldn't work? I noticed some for sale (just the filters) at a grocery store. They were like $25. According to the label, they seem to meet the required specs. 99.7%/0.3 Microns, etc. Am i missing something?

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OfflineCitizenErased
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Re: DIY Flow Hood from Instructables [Re: CitizenErased]
    #20607821 - 09/23/14 06:22 PM (10 years, 3 months ago)

Anyone?

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InvisibleGhatti
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Re: DIY Flow Hood from Instructables [Re: CitizenErased]
    #20607960 - 09/23/14 06:50 PM (10 years, 3 months ago)

What you are missing is laminar flow. While I won't get into ways around it I will say that filter will provide close to sterile air. But it really won't be air that you can work in as it will be mixed with non sterile air since it isn't laminar.

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OfflineCitizenErased
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20607984 - 09/23/14 06:55 PM (10 years, 3 months ago)

Thank you for the reply. However, I was referring to the filters.

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InvisiblebodhisattaMDiscordReddit
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Re: DIY Flow Hood from Instructables [Re: CitizenErased]
    #20608075 - 09/23/14 07:13 PM (10 years, 3 months ago)

Quote:

CitizenErased said:
Yeah. I have a SAB. I've had more problems than I expected. While we're on the subject,is there any reason the hepa filters used in some vacuums wouldn't work? I noticed some for sale (just the filters) at a grocery store. They were like $25. According to the label, they seem to meet the required specs. 99.7%/0.3 Microns, etc. Am i missing something?



yes it's not a laminar flow filter. it's just a hepa filter that does 0 good for this hobby

something like this
http://www.terrauniversal.com/laminar-flow-hoods/particle-filters.php

they're usually in the hundreds of dollar range.

A SAB is way more useful for a hobby mycologist. it's easier to work with which I mean it's requires more skill to have good sterile technique with a FH than using a SAB. With a FH you can't work with contaminated cultures which you often will as a hobby mycologist to clean up cultures grown out from spores etc...

if you're a noob and you think you need a FH to make your life easier you're fooled, you need to work on your skill and technique first.

Edited by Trusted cuItivator (09/23/14 07:15 PM)

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InvisibleGhatti
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Re: DIY Flow Hood from Instructables [Re: bodhisatta]
    #20608132 - 09/23/14 07:27 PM (10 years, 3 months ago)

I said the filter is adequate for filtering contams if you wanna run it in your workspace, but you can't make a hood out of it.

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InvisiblebodhisattaMDiscordReddit
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20608235 - 09/23/14 07:53 PM (10 years, 3 months ago)

yea but you didn't explain what that meant, and :shrug: other people have things to add.

Why bother running a filter like that in your work space. if you go from having 10^8 contaminants in your work room down to 10^7 because of that filter running then you're still fucked if you don't know what you're doing.

it's about as dumb as spraying lysol in a bathroom to try to "sanitize" it.

Edited by Trusted cuItivator (09/23/14 07:53 PM)

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InvisibleGhatti
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Re: DIY Flow Hood from Instructables [Re: bodhisatta]
    #20608258 - 09/23/14 07:59 PM (10 years, 3 months ago)

Hey now it kills 99.9% of germs on contact.

But.......only if that contact is saturated for 50 secs or more and only if that contact is on a totally non porous surface lol

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InvisiblebodhisattaMDiscordReddit
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20608273 - 09/23/14 08:03 PM (10 years, 3 months ago)

.01 of a million is 10,000 still left around. not good enough considering there's more than millions of spores and bacteria around every place on the planet that you can do mycology work. you're going to need good sterile technique, not corner cutting precautions.

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InvisibleGhatti
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Re: DIY Flow Hood from Instructables [Re: bodhisatta]
    #20608345 - 09/23/14 08:21 PM (10 years, 3 months ago)

Just let him hook up his vaccum cleaner, spray lysol, and flame sterilize his hands.

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InvisiblebodhisattaMDiscordReddit
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20608378 - 09/23/14 08:27 PM (10 years, 3 months ago)

Quote:

Ghatti said:
Just let him hook up his vaccum cleaner, spray lysol, and flame sterilize his hands.



:awepreciation:great post

you planning on helping OP learn something about how to use a SAB or have something to add about flow hoods?

or are you really actually having a problem with people posting good advice after your bad advice?

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InvisibleGhatti
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Re: DIY Flow Hood from Instructables [Re: bodhisatta]
    #20608418 - 09/23/14 08:38 PM (10 years, 3 months ago)

How is running a true hepa in your workspace a bad idea? I wouldn't expect him to believe an air purifier would grab a significant amount of airborne stuff and do open air work.

I gave constructed advice that wasn't the repeated "build a sab".  Said yeah its a  hepa and will  filter contams to an extent, said no, you can't use it to build a hood or a sterile workspace. Told him he wouldn't get laminar flow from it.

Someone is in a bad mood this evening lol

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InvisiblebodhisattaMDiscordReddit
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20608486 - 09/23/14 08:53 PM (10 years, 3 months ago)

not at all really,
you don't want any turbulent air in your work space. turn off all air fans appliances filters etc...

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InvisibleGhatti
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Re: DIY Flow Hood from Instructables [Re: bodhisatta] * 1
    #20608498 - 09/23/14 08:55 PM (10 years, 3 months ago)

Yeah I just meant run one to keep ambient dust and the like at a minimum. If for nothing else than to breathe easier

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OfflineKazak
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20608533 - 09/23/14 09:02 PM (10 years, 3 months ago)

Quote:

Ghatti said:
I gave CONSTRUCTIVE advice that wasn't the repeated "build a sab".



Fixed that for ya.

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OfflineCitizenErased
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20608743 - 09/23/14 09:45 PM (10 years, 3 months ago)

Quote:

Ghatti said:
What you are missing is laminar flow. While I won't get into ways around it I will say that filter will provide close to sterile air. But it really won't be air that you can work in as it will be mixed with non sterile air since it isn't laminar.




I must have overlooked everything but the first sentence of this post somehow. Either that, or there was a glitch. Either way, again, thanks for replying.

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OfflineCitizenErased
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Re: DIY Flow Hood from Instructables [Re: CitizenErased]
    #20609111 - 09/23/14 10:54 PM (10 years, 3 months ago)

What about this guy? http://www.ebay.com/itm/Flanders-0-009-4-19-04-SU-00-00-23G36Q6-Laminar-Flow-Grade-VLSI-Filter-/351155279332?pt=LH_DefaultDomain_0&hash=item51c27c55e4

Missing a screen though. What kind of screen do they use? Where might I find it?

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InvisiblebodhisattaMDiscordReddit
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Re: DIY Flow Hood from Instructables [Re: CitizenErased]
    #20612524 - 09/24/14 04:46 PM (10 years, 3 months ago)

you can't just use any filter. there's a bunch of math involved in matching a filter to a blower motor. you need to know the CFM of the blower motor and the static pressure rating of the filter, the amount of air and the velocity of that air determine if that filter will produce laminar flow too much too fast or too little too slow and you will not achieve laminar flow from a laminar HEPA filter. you don't need a flow hood and you need to do a shitload more research if you're still going to consider one despite the fact that you really don't need one

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OfflineCitizenErased
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Re: DIY Flow Hood from Instructables [Re: bodhisatta]
    #20614140 - 09/24/14 09:23 PM (10 years, 3 months ago)

I'm aware that not any filter can be used. That said, why would one not achieve laminar flow using a laminar HEPA filter, assuming that it has in fact been matched appropriately to a blower motor? Also, this is research. The sole purpose behind my presence here right now, or ever, is to conduct research. As far as I know, the fastest and most effective way to research something, is to consult a bunch of people who are likely more knowledgeable in the matter. So...

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InvisibleGhatti
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Re: DIY Flow Hood from Instructables [Re: CitizenErased]
    #20614198 - 09/24/14 09:33 PM (10 years, 3 months ago)

If you match a filter with enough static pressure to an adequate blower you would get laminar flow.

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InvisiblebodhisattaMDiscordReddit
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Re: DIY Flow Hood from Instructables [Re: Ghatti]
    #20614255 - 09/24/14 09:43 PM (10 years, 3 months ago)

sort of

you need to know things like the air from the blower needs to enter at 90º to the filter not 180º, you need to know your plenum volume as well, you need to know how much static pressure the filter develops at your blowers CFM and have that match accordingly to produce laminar flow. There's more to the design than just the blower CFM and filter static pressure the design has to be just right as well.

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Offlinerolyat1200
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Re: DIY Flow Hood from Instructables [Re: bodhisatta]
    #20614829 - 09/24/14 11:47 PM (10 years, 3 months ago)

Hey guys and gals, I'm new here to whole thing. I'm thinking about building a real flow hood. Good quality design, quality filter from Fungi Perfect, and a blower from grainger. I've done my research, but what I can't find any info on is what does the pre filter do to static pressure ? Fungi Perfect has a 12 x 12 99.99 HEPA with a rating of 120 cfm at .5 static pressure. I know how to look up the fans cfms at static pressure, I just don't know what the pre filter will do to static pressure rating(A), and will the static pressure be achieved by the boxed in design of my flow hood and HEPA filter? I would like to build a box on top with the  fan and pre-filter then blow into the plenum. If I have a fan capable of performing at my static pressure rating of the filter will it be laminar flow ?

Thank you !

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