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Invisiblejellyfish


Registered: 10/02/05
Posts: 7,457
Flow Hood Speed
    #18462680 - 06/23/13 09:07 PM (10 years, 10 months ago)

I just put together a flow hood today (so excited) and I'm afraid the fan I'm using is too strong. How can I tell? I don't want to damage the filter by continuing to use it. It immediately extinguishes a lighters flame and actually provides quite a breeze.

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Invisible36fuckin5
Alchemycologist


Registered: 08/11/03
Posts: 12,091
Loc: Diving into Mystical Territori...
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Re: Flow Hood Speed [Re: jellyfish]
    #18466094 - 06/24/13 04:44 PM (10 years, 10 months ago)

That's way too high. You want about 100 CFM coming out of your filter. It should bend a lighter 90 degrees and not put it out.


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Pat The Bunny said:
A punk rock song won't ever change the world, but I can tell you about a couple that changed me.

bodhisatta said:
i recommend common sense and figuring it out.

These are the TEKs I use. They're all as cheap and easy as possible, just like your mom.

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Invisiblejellyfish


Registered: 10/02/05
Posts: 7,457
Re: Flow Hood Speed [Re: 36fuckin5]
    #18466949 - 06/24/13 07:47 PM (10 years, 10 months ago)

Alright well I guess too high is better than too low. I'll need to find a way to regulate the speed. thanks. I won't run it until I tone it down. I researched the fan and it should put out 100 CFM at the static pressure of my filter so not sure why it's so strong.

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OfflineRogerRabbitM
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Registered: 03/26/03
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Loc: Seattle
Last seen: 1 year, 2 months
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Re: Flow Hood Speed [Re: jellyfish]
    #18472519 - 06/25/13 10:39 PM (10 years, 10 months ago)

You don't want 100 cfm, you want 100 fpm.  The lighter should bend 45 to 60 degrees, but not flicker or go out.  Block off part of the intake or get a smaller blower.
RR


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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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Invisible36fuckin5
Alchemycologist


Registered: 08/11/03
Posts: 12,091
Loc: Diving into Mystical Territori...
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Re: Flow Hood Speed [Re: RogerRabbit]
    #18472734 - 06/25/13 11:24 PM (10 years, 10 months ago)

Quote:

RogerRabbit said:
You don't want 100 cfm, you want 100 fpm.  The lighter should bend 45 to 60 degrees, but not flicker or go out.  Block off part of the intake or get a smaller blower.
RR




Yeah, this. I've only helped build one flowhood, and I didn't do the math.


--------------------
Pat The Bunny said:
A punk rock song won't ever change the world, but I can tell you about a couple that changed me.

bodhisatta said:
i recommend common sense and figuring it out.

These are the TEKs I use. They're all as cheap and easy as possible, just like your mom.

Extras: Filter Print Post Top
OfflineMasterElectron
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Male

Registered: 04/30/13
Posts: 97
Loc: most the time on a ring o...
Last seen: 10 years, 6 months
Re: Flow Hood Speed [Re: 36fuckin5]
    #18481231 - 06/27/13 07:44 PM (10 years, 10 months ago)



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:goat:

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Invisiblejellyfish


Registered: 10/02/05
Posts: 7,457
Re: Flow Hood Speed [Re: MasterElectron]
    #18501044 - 07/02/13 06:52 AM (10 years, 10 months ago)

Alright I made a pre filter using layers of cheese cloth and now it bends the lighter at a 45 degree angle. I want to use the smoke test and a bottle to see if flow is laminar but don't like the idea of smoke being sucked into my flow hood. I might just do a bunch of agar plates, leave em open under the stream of air and see if they contam.

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OfflineRogerRabbitM
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Registered: 03/26/03
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Loc: Seattle
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Re: Flow Hood Speed [Re: jellyfish]
    #18505775 - 07/03/13 06:28 AM (10 years, 10 months ago)

Quote:

I might just do a bunch of agar plates, leave em open under the stream of air and see if they contam.





That's a poor way to test.  Don't leave petri dishes open for more than a few seconds, flow hood or not.  Use a smoke test if you want to know if air is being drawn into the work area from around the edges.
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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Invisiblejellyfish


Registered: 10/02/05
Posts: 7,457
Re: Flow Hood Speed [Re: RogerRabbit]
    #18508180 - 07/03/13 07:05 PM (10 years, 10 months ago)

Thanks RR. Sorry for posting such a noob question I'm really trying to step things up. I see some defects in my filter which I got from fungi perfecti. The metal bits aren't all shaped the same. I will do the smoke test and post a pic of my hood (which I'm proud of). Thanks again.  I hope to contribute to this forum through my agar work/ liquid culture/ strain crosses etc.

edit: I was going to start my p. tampanensis spores on agar tomorrow but I just did the smoke test with some incense and if I hold the incense by the edge of the filter the smoke flows into the stream of air from the HEPA. Guess I fucked up...

Edited by jellyfish (07/04/13 09:07 PM)

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Invisiblejellyfish


Registered: 10/02/05
Posts: 7,457
Re: Flow Hood Speed [Re: jellyfish]
    #18515072 - 07/05/13 08:26 AM (10 years, 10 months ago)

I just realized smoke gets sucked into the stream but as soon as it's in front of the filter it just travels straight. So I think if I work in the middle of the filter I'll be okay as the smoke wasn't tumbling or mixing or anything. Going to test it today with some spores

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