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Offlinemushpunx
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Ahh! Have I been using the wrong blower?? Flow Hood
    #24918907 - 01/16/18 05:35 PM (7 years, 1 day ago)



So I built my hood a few years ago. Its an 18 x 24" hood, the filter is 12 x 24 x 5.8" and I built it with a 10 or 12" deep plenum behind the filter.

I used the Dayton 1TDT2 blower and at the time I thought it pushed just above 300CFM @ 1.2SP.
Today I found out I was given the wrong blower specs. I went and dug my notes out of the garage and confirmed this.



^ This is the proper blower specs for this model, it pushes 360CFM @ .8"SP but if you follow it up it dips down to under 100CFM @ 1.2sp!
This would seem much to weak for my filter.

I never noticed anything wrong because with a quick lighter test, it blows a flame 90° from a few inches up to at least a foot away from the filter face.

I had 100% success rate with agar work as well.
In past years I have had a few periods of baffling mold outbreaks but I chalked it up to human error and stepped up my techniques, since then things have gone pretty well.


So now I'm left with a conundrum. How can I tell if my flow cabinet is working properly and if it is, why?

Should I leave it alone, or change out the blower to a higher power one?


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Edited by mushpunx (01/16/18 06:16 PM)

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Invisiblevan hattonFacebookDiscord
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24918923 - 01/16/18 05:42 PM (7 years, 1 day ago)

That's the one that stro uses as well for his 18x24x6 if I'm not mistaken.

You could buy a cheap cfm meter.

With meters you get what you pay for :shrug:


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If I ever give out misinformation please inform me so I can have the correct information. :cheers:

Tmethyl said:
Chuck Norris once roundhouse kicked a monotub that wasn't pinning fast enough. The force of the kick rearranged the genetics of the mushrooms, we now call them Penis Envy.

Caps McGee said:
:thumbsup:
Fun part is figuring out what works best for you

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Offlinemushpunx
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: van hatton]
    #24918978 - 01/16/18 06:02 PM (7 years, 1 day ago)

Hmmm youre correct, I just looked thru Stro's build and he did use the same blower and filter combo as I did

He says:

" I knew I was planning on using a 24"x18"x 5.8" HEPA purchased from FungiPerfecti which has a static pressure rating of 0.8” and using a pre-filter with an estimated static pressure rating of 0.2”. "

https://www.shroomery.org/forums/showflat.php/Number/21518893

Here is the link to Stro's build ^
It seems he built his hood after I did


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Edited by mushpunx (01/16/18 06:09 PM)

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Invisiblevan hattonFacebookDiscord
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24919157 - 01/16/18 07:19 PM (7 years, 1 day ago)

Did you get your filter from fp? When I called them they said their filters had an 1 inch sp. Interesting he says that because according to your chart at 1 in sp it should be just above 100.edit 200~

Stro even says .8sp :shrug:


--------------------
If I ever give out misinformation please inform me so I can have the correct information. :cheers:

Tmethyl said:
Chuck Norris once roundhouse kicked a monotub that wasn't pinning fast enough. The force of the kick rearranged the genetics of the mushrooms, we now call them Penis Envy.

Caps McGee said:
:thumbsup:
Fun part is figuring out what works best for you

Edited by van hatton (01/16/18 07:33 PM)

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Offlinemushpunx
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: van hatton]
    #24919241 - 01/16/18 07:49 PM (7 years, 1 day ago)

Yea my filter is from FP. I was under the impression they were 1" so too.

FP actually recomends my blower model for their 12 x 24" filter , which would need 200CFM @ 1.2 SP


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Invisiblevan hattonFacebookDiscord
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24919581 - 01/16/18 10:38 PM (7 years, 1 day ago)

Weird as I've heard their blower matches are op for the filters:shrug:

You could leave a plate open in front of it for a few hours.


--------------------
If I ever give out misinformation please inform me so I can have the correct information. :cheers:

Tmethyl said:
Chuck Norris once roundhouse kicked a monotub that wasn't pinning fast enough. The force of the kick rearranged the genetics of the mushrooms, we now call them Penis Envy.

Caps McGee said:
:thumbsup:
Fun part is figuring out what works best for you

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Offlinemushpunx
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: van hatton]
    #24919882 - 01/17/18 03:55 AM (7 years, 1 day ago)

I have left media open in front of my FH before. I have had a 100% success rate with my agar work.


I just wanna know if Ive got laminar flow or not


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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24919945 - 01/17/18 05:34 AM (7 years, 22 hours ago)

Fwiw, if it's working for you, I wouldn't change it. But if you feel like the blower is about to dump on you, yeah, get a larger one.

The test of an open agar plate in front of the hood is sure to let you know if you're okay or not.

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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24919953 - 01/17/18 05:42 AM (7 years, 22 hours ago)

FP over rates the blowers from what I've seen. T
Quote:

mushpunx said:
I have left media open in front of my FH before. I have had a 100% success rate with my agar work.


I just wanna know if Ive got laminar flow or not




You need a CFM meter then. Problem solved like van said.


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






:gd_icon: Shadowboxing the apocalypse and wandering the land :gd_icon:

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Invisiblevan hattonFacebookDiscord
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: Crispykoot]
    #24925130 - 01/19/18 08:56 AM (6 years, 11 months ago)

Let us know the outcome too if you decide to get one. I'm probably going to be building stros here soon.


--------------------
If I ever give out misinformation please inform me so I can have the correct information. :cheers:

Tmethyl said:
Chuck Norris once roundhouse kicked a monotub that wasn't pinning fast enough. The force of the kick rearranged the genetics of the mushrooms, we now call them Penis Envy.

Caps McGee said:
:thumbsup:
Fun part is figuring out what works best for you

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Offlinemushpunx
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: van hatton]
    #24925175 - 01/19/18 09:18 AM (6 years, 11 months ago)

Yea I will. I messaged Stro but I dunno if he is around much these days.

My hood, as far as I know works beautifully.
But then again people get away with those Shmuvbox things, which is just a cheap HEPA blowing into a SAB basically.
I need to know its working as it should.

So I guess I'll get a CFM meter and check


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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx] * 1
    #24925274 - 01/19/18 10:08 AM (6 years, 11 months ago)

Have you tried a smoke test?
Light an incense stick, and slowly move it around in front of your filter. You should be able to see if there are any spots of turbulence.

This is how they visualize the flow pattern/test for laminar flow in "real" labs.

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OfflinehamloafM
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24925305 - 01/19/18 10:16 AM (6 years, 11 months ago)

Quote:

ShroomyToons said:
Fwiw, if it's working for you, I wouldn't change it. But if you feel like the blower is about to dump on you, yeah, get a larger one.

The test of an open agar plate in front of the hood is sure to let you know if you're okay or not.



:whatshesaid:

This rig has been serving you well for a few years now, so If it ain't broke don't fix it, but if it will make you feel more comfortable to replace the blower go for it.  Replacing the blower is worth being able to sleep at night.


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How I Get Stuff done. - My Reference Guide. - My Grows.

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InvisiblebodhisattaMDiscordReddit
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: foragedfungus] * 1
    #24925325 - 01/19/18 10:25 AM (6 years, 11 months ago)

Quote:

foragedfungus said:
Have you tried a smoke test?
Light an incense stick, and slowly move it around in front of your filter. You should be able to see if there are any spots of turbulence.

This is how they visualize the flow pattern/test for laminar flow in "real" labs.




That's got to be so frustrating explaining why bad air is bad air. Don't work in a science field unless that shit just inherently makes sense to you lol.

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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: bodhisatta]
    #24925579 - 01/19/18 12:11 PM (6 years, 11 months ago)

Haha. Yeah.
But it was the only smoke test video I found that used a horizontal hood instead of a vertical one. Some other videos of clean rooms and fog machines were pretty cool though.

If you skip to 8:55 he demonstrates great technique for holding multiple sterile items in the flow without putting them down.

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Offlinemushpunx
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: hamloaf]
    #24925776 - 01/19/18 01:58 PM (6 years, 11 months ago)

Quote:

hamloaf said:
Quote:

ShroomyToons said:
Fwiw, if it's working for you, I wouldn't change it. But if you feel like the blower is about to dump on you, yeah, get a larger one.

The test of an open agar plate in front of the hood is sure to let you know if you're okay or not.



:whatshesaid:

This rig has been serving you well for a few years now, so If it ain't broke don't fix it, but if it will make you feel more comfortable to replace the blower go for it.  Replacing the blower is worth being able to sleep at night.





Haha right?  I just have to wonder if it had anything to do with some of the difficult periods of outbreaks I've had in the last few years

I'll probably just leave it alone, but if I find a proper blower for a decent price I might switch it- wouldn't be hard at all just some bolts.

Other option would be to sell the 18 x 24" hood as is but without the blower and buy a 12 x 24" filter and build a smaller hood.
Sometimes I wish I had a 12 x 24 so I can move it around easy

Well see. I'm waiting on Stro's reply, he used the same combo and I'm sure he knows more about this than I do probably haha


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Invisiblevan hattonFacebookDiscord
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24925784 - 01/19/18 02:02 PM (6 years, 11 months ago)

Keep me posted :rockon: rather not buy the wrong blower :lol:


--------------------
If I ever give out misinformation please inform me so I can have the correct information. :cheers:

Tmethyl said:
Chuck Norris once roundhouse kicked a monotub that wasn't pinning fast enough. The force of the kick rearranged the genetics of the mushrooms, we now call them Penis Envy.

Caps McGee said:
:thumbsup:
Fun part is figuring out what works best for you

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Offlinemushpunx
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24925885 - 01/19/18 02:53 PM (6 years, 11 months ago)

OK so I grabbed some insence and repeated what they did in the video. No turbulence , it blew straight forwards, level from where I held the incense.  Up close, over a foot away, and in all different places on the good, all corners.

Flame test with bic lighter , and propane torch.

It reacted just like in that video.


So would you guys say its working properly, getting laminar flow?

Thanks


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Invisibleforagedfungus
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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24925982 - 01/19/18 03:27 PM (6 years, 11 months ago)

"No turbulence, straight forwards, level from where I held the incense,  in all different places on the hood, all corners."


Sounds just like these Laminar flow definitions from the internet:
-uninterrupted flow in which the direction of flow at every point remains constant.
-Smooth, orderly movement, in which there is no turbulence, and any given subcurrent moves more or less in parallel with any other nearby subcurrent.


It's worth mentioning that the 100fpm we see used in flowhood builds is near the middle of the range (it makes the math easier). According to the clean room validation people "critical areas should have laminar airflow of 90 fpm ± 20%" so really anywhere from 72-108 fpm (and that's just what they'll certify,I'd bet you could get away with quite a bit slower/faster).

If your plates are clean, I'm sure you're fine.

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Re: Ahh! Have I been using the wrong blower?? Flow Hood [Re: mushpunx]
    #24926020 - 01/19/18 03:39 PM (6 years, 11 months ago)

It's fine.


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How I Get Stuff done. - My Reference Guide. - My Grows.

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