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Amazon Shop: Agar, HEPA Filter, Petri Dish

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OfflineEightball
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Flowhood almost done (pics) need input
    #4026620 - 04/07/05 04:08 PM (12 years, 3 months ago)

Heres what i have so far. Running 2 AC fans rated at over 100cfm each. and thats just a 3m non hepa im gonna test for this run. I was wondering what i should do about sides/top of the work surface. at the moment im thinking just 2 thin pieces of wood paraellel with the sides and cut at an angle so a plexiglass top could slope down towards the user. can i get away with less than this?



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Invisibleshobimono
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Re: Flowhood almost done (pics) need input [Re: Eightball]
    #4026698 - 04/07/05 04:26 PM (12 years, 3 months ago)

Aren't hepa filters like 5 or 11 inches thick? I don't think those 2 small fans will move air through a filter that thick.


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Offlinemattymonkey
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Re: Flowhood almost done (pics) need input [Re: Eightball]
    #4027028 - 04/07/05 05:39 PM (12 years, 3 months ago)



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OfflineRogerRabbitM
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Re: Flowhood almost done (pics) need input [Re: mattymonkey]
    #4030618 - 04/08/05 01:51 PM (12 years, 3 months ago)

You will require a squirrel cage type fan to supply the static pressure necessary to achieve laminar flow. You need to find an old furnace fan, or purchase one from grainger.com or a local store. There is no physical way for a blade type fan like that to supply enough static pressure. It will simply cavitate under the resistance of the filter. Also, as noted, you'll need a proper laminar flow hepa filter which will be at least 5 inches thick. The filter you're using for tests will make an excellent pre-filter.
RR


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OfflineAnnoA
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Re: Flowhood almost done (pics) need input [Re: RogerRabbit]
    #4030653 - 04/08/05 02:01 PM (12 years, 3 months ago)

>You will require a squirrel cage type fan to supply the static pressure necessary to
>achieve laminar flow.

I use an in line centrifugal fan

http://www.google.com/search?q=In-line%2BCentrifugal%2BFan

>you'll need a proper laminar flow hepa filter which will be at least 5 inches thick.

The one I use is 70 mm, which is 2.75 inch.
The thickness depends on the exact filter design and manufacturer.

http://www.fungifun.org/flowhood/


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Offlinemattymonkey
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Re: Flowhood almost done (pics) need input [Re: Anno]
    #4031417 - 04/08/05 05:35 PM (12 years, 3 months ago)

there is a guy on ebay, samgreat, sells refurbished cage blowers or whatever.. perfect for this or large growrooms.. usually range like $70-100, cheap.. not sure how you search on user but look for samgreat or just search on blowers..


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Offlinehyphae
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Re: Flowhood almost done (pics) need input [Re: mattymonkey]
    #4031933 - 04/08/05 07:48 PM (12 years, 3 months ago)

RR got it right excellent prefilters! :wink:


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OfflineEightball
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Re: Flowhood almost done (pics) need input [Re: Eightball]
    #4148911 - 05/08/05 02:10 AM (12 years, 2 months ago)

i added a plexiglass sneeze guard + a frame with sides. After a load of petris (80) ive had 1 contam and i think that was from me accidentally poking the agar with my finger.




pheonix oyster culture.


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If you're frightened of dying and you're holding on.you'll see devils tearing your life away.
But...if you've made your peace, then the devils are really angels
Freeing you from the earth.


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InvisibleCorporal Kielbasa
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Re: Flowhood almost done (pics) need input [Re: Anno]
    #4148929 - 05/08/05 02:20 AM (12 years, 2 months ago)

I go to home depot and get the ultra allergen furnace filters. They filter out molds and such. I bought 2 of them at 15 a peace. taped them together. Went to a yard sale bought a furnace blower for 20 bucks. Then I found a metal box with one side that was open and it had a hole in the back side. cut a peace of partical board to fit the front cut a whole in the board to fit the filter. and facetted the fan on the back. I did a couple test runs and had zero contams, and used it well for a year. Still going strong. Total cost was about 60 bucks and about two hours labor.


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InvisibleCorporal Kielbasa
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Re: Flowhood almost done (pics) need input [Re: Eightball]
    #4148935 - 05/08/05 02:22 AM (12 years, 2 months ago)

i think the ones i get ar 3m too.


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InvisibleMrMaddHatter
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Re: Flowhood almost done (pics) need input [Re: Eightball]
    #4148971 - 05/08/05 02:40 AM (12 years, 2 months ago)

Very impressive work! Not a true laminar hood, but if it works, it works :thumbup:

1 out of 80, thats 0.8% contamination rate. Not bad.


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OfflineEightball
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Re: Flowhood almost done (pics) need input [Re: Eightball]
    #4148984 - 05/08/05 02:47 AM (12 years, 2 months ago)

1.25% contam rate
pretty decent reguardless. though i would love a larger work area and a proper table. but im sorta broke for a while so i make due.


--------------------
If you're frightened of dying and you're holding on.you'll see devils tearing your life away.
But...if you've made your peace, then the devils are really angels
Freeing you from the earth.


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InvisibleYidakiMan
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Re: Flowhood almost done (pics) need input [Re: Eightball]
    #4149909 - 05/08/05 12:54 PM (12 years, 2 months ago)

That feeling for more work area never really goes away. Mine's 24'x24' and I wish I had a 4'x2'.


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Invisibleagar
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Re: Flowhood almost done (pics) need input [Re: YidakiMan]
    #4150076 - 05/08/05 01:56 PM (12 years, 2 months ago)



:grin: Last one I built is a 24X48 & I just love it. Not very portable, though.


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Amazon Shop: Agar, HEPA Filter, Petri Dish

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