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OfflineYesIeatShrooms
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Flow hood height impairment?
    #27019324 - 11/03/20 12:40 PM (3 years, 3 months ago)

So just wanted to get a little bit of info from y'all. Now I'm more asking for person experience not just what you think would be better. Now that that's out of the way this is what I'm trying to establish:

  I am going to be building a flow hood very soon. Now my filter height is on the shorter end being 14" tall. Do any of you with 12-14" flow hood heights find that you could most definitely use more vertical space and is it an annoyance? What exactly are you doing when you feel vertically challenged? Grain bags? Most of us on shroomery here build boxes where the air comes from in front of you. So you get as much height as you do filter.

  What I am getting at here is if you feel extremely vertically challenged and have to come up with silly methods to try and fit within the filter then I would instead build a over head flow hood type instead so I would then get 14" depth to work in with much more height and I could basically have it any height I wanted. Obviously a box like that would take more to construct but if its going to save headache down the road, I'm thinking it would be the better solution.

  Another thing I have a question about, are the blowers placed on top of the boxes for a reason? Or could I build a stand for my hood and have the blower inside the stand and a pre-filter built into the stand instead of being on top of my hood? 

thanks - YIES


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Offlinesonoramo
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Re: Flow hood height impairment? [Re: YesIeatShrooms]
    #27019439 - 11/03/20 01:22 PM (3 years, 3 months ago)

Quote:

YesIeatShrooms said:
... Do any of you with 12-14" flow hood heights find that you could most definitely use more vertical space and is it an annoyance? What exactly are you doing when you feel vertically challenged? Grain bags? Most of us on shroomery here build boxes where the air comes from in front of you. So you get as much height as you do filter.




My HEPA filter outlet is 3 inches high. I think of it more as a "tunnel" than a hood. I switched to using LC, and therefore don't need to put grain jars or bags into the sterile environment. I only need the HEPA when germinating spores or transferring between plates. Going from agar to LC, I use a syringe to biopsy the growth inside the clean area, then pull the syringe out to inoculate a jar in open air, through a SHIP. I only put one hand in the tunnel, to lift the top on the petri. I have a much smaller hole in the tunnel just for tools (scalpel, inoculation loop, long syringe needle, etc.). This way, the hand that holds the sterile tool never goes into the sterile area. It's a very comfortable setup and takes very little space (or money).


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OfflineYesIeatShrooms
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Re: Flow hood height impairment? [Re: sonoramo]
    #27019492 - 11/03/20 01:42 PM (3 years, 3 months ago)

Quote:

sonoramo said:
Quote:

YesIeatShrooms said:
... Do any of you with 12-14" flow hood heights find that you could most definitely use more vertical space and is it an annoyance? What exactly are you doing when you feel vertically challenged? Grain bags? Most of us on shroomery here build boxes where the air comes from in front of you. So you get as much height as you do filter.




My HEPA filter outlet is 3 inches high. I think of it more as a "tunnel" than a hood. I switched to using LC, and therefore don't need to put grain jars or bags into the sterile environment. I only need the HEPA when germinating spores or transferring between plates. Going from agar to LC, I use a syringe to biopsy the growth inside the clean area, then pull the syringe out to inoculate a jar in open air, through a SHIP. I only put one hand in the tunnel, to lift the top on the petri. I have a much smaller hole in the tunnel just for tools (scalpel, inoculation loop, long syringe needle, etc.). This way, the hand that holds the sterile tool never goes into the sterile area. It's a very comfortable setup and takes very little space (or money).



3 inches high?!? i must be missing something here or im way too baked right now but how do you work in 3 inches of space? That dab must've hit me harder than i thought....


Edited by YesIeatShrooms (11/03/20 01:52 PM)


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OfflineYesIeatShrooms
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Re: Flow hood height impairment? [Re: YesIeatShrooms]
    #27019506 - 11/03/20 01:49 PM (3 years, 3 months ago)

Another question... Do i need to have the blower a certain distance from the back of the filter or does it not really matter?


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OfflineSenku
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Re: Flow hood height impairment? [Re: YesIeatShrooms] * 1
    #27019635 - 11/03/20 02:50 PM (3 years, 3 months ago)

Quote:

YesIeatShrooms said:
Another question... Do i need to have the blower a certain distance from the back of the filter or does it not really matter?




You should have a plenum for laminar flow, so that the pressure distributes evenly on the whole filter.


--------------------


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OfflineYesIeatShrooms
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Re: Flow hood height impairment? [Re: Senku]
    #27019834 - 11/03/20 04:43 PM (3 years, 3 months ago)

Quote:

Senku said:
Quote:

YesIeatShrooms said:
Another question... Do i need to have the blower a certain distance from the back of the filter or does it not really matter?




You should have a plenum for laminar flow, so that the pressure distributes evenly on the whole filter.



And how do I achieve that, a "plenum"? Had to look that word up never heard it before lol.


Edited by YesIeatShrooms (11/03/20 04:43 PM)


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Offlinesonoramo
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Re: Flow hood height impairment? [Re: YesIeatShrooms]
    #27019844 - 11/03/20 04:48 PM (3 years, 3 months ago)

Quote:

YesIeatShrooms said:
[. . .
3 inches high?!? i must be missing something here or im way too baked right now but how do you work in 3 inches of space? That dab must've hit me harder than i thought....




I just posted it with pictures here.


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OfflineYesIeatShrooms
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Re: Flow hood height impairment? [Re: sonoramo]
    #27019869 - 11/03/20 05:02 PM (3 years, 3 months ago)

Quote:

sonoramo said:
Quote:

YesIeatShrooms said:
[. . .
3 inches high?!? i must be missing something here or im way too baked right now but how do you work in 3 inches of space? That dab must've hit me harder than i thought....




I just posted it with pictures here.



Oh, I'm talking about building an actual flow hood and am asking about the how bad of a restriction 14" of height will actually be, if even at all.

I mean I could raise the hood so that the hepa starts like 4 inches over my table. Then have some sort of raised rack to work on agar and such in front of the filter. When doing grains I would then remove the rack so that the tops of the bags are perfectly in line with the filter no having to tip them on their sides or anything wonky. So I'm thinking it won't be much of an issue having a 14" height instead of 24". Hey I mean it's better than 12 right? Or better yet, 3!  :laugh2:


Edited by YesIeatShrooms (11/03/20 05:04 PM)


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OfflineSenku
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Re: Flow hood height impairment? [Re: YesIeatShrooms]
    #27021057 - 11/04/20 09:25 AM (3 years, 3 months ago)

Quote:

YesIeatShrooms said:
Quote:

Senku said:
Quote:

YesIeatShrooms said:
Another question... Do i need to have the blower a certain distance from the back of the filter or does it not really matter?




You should have a plenum for laminar flow, so that the pressure distributes evenly on the whole filter.



And how do I achieve that, a "plenum"? Had to look that word up never heard it before lol.




Plenum is just a empty space behind your filter where fan blows.

Quote:

RogerRabbit said:
The deeper the better.  The purpose is for the plenum to become pressurized by the blower, and then be large enough to allow the pressure to equalize over the entire back surface of the filter.  This helps to ensure laminar flow out the front.

Consider 6" minimum.  If you can make it ten to twelve inches, even better.
RR




--------------------


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OfflineYesIeatShrooms
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Re: Flow hood height impairment? [Re: Senku]
    #27021160 - 11/04/20 10:25 AM (3 years, 3 months ago)

Quote:

Senku said:
Quote:

YesIeatShrooms said:
Quote:

Senku said:
Quote:

YesIeatShrooms said:
Another question... Do i need to have the blower a certain distance from the back of the filter or does it not really matter?




You should have a plenum for laminar flow, so that the pressure distributes evenly on the whole filter.



And how do I achieve that, a "plenum"? Had to look that word up never heard it before lol.




Plenum is just a empty space behind your filter where fan blows.

Quote:

RogerRabbit said:
The deeper the better.  The purpose is for the plenum to become pressurized by the blower, and then be large enough to allow the pressure to equalize over the entire back surface of the filter.  This helps to ensure laminar flow out the front.

Consider 6" minimum.  If you can make it ten to twelve inches, even better.
RR






:cheers:


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