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OfflineCisco47723
El Capitane
Male
Registered: 02/14/13
Posts: 9
Loc: Northwest Territory
Last seen: 8 years, 9 months
A question about air movement
    #21226444 - 02/04/15 03:18 PM (9 years, 3 months ago)

SO over the past couple of months I've attempted to get back into the fungus game because it was something I used to be good at. Several attempts have shown me the techniques of the past are done, and it is time to move on to a more professional standard, meaning, it's time for a flowhood and culture work. Now, all the guides I've read about it (The Stamets Book, Evil Mushroom's, and http://www.fungifun.org/English/Flowhood) all used the same formula which would place me at about needing a 24" x 24" x 6" hepa filter with around 1" of static pressure and a fan capable of producing 400 cfm. In my city, I'm sure it isn't much different anywhere else, the only local places that carry exactly those filters that I and any other mycologist need are places that serve businesses, offices, or industrial applications, and give a cold shoulder to anyone looking for "home use". So I figured I had to buy one online. Now, the best place when taking reliability, cost, and sketchiness into account is Earth's Tongue. They have a 24x24x6 for a grand total of about 200 USD (http://www.earthstongue.com/product/24_x_24_x_6_HEPA_FILTER_REPLACEMENT). But when I called the place to find out about static pressure of the filter, I start asking him some questions since this is a website that advertises that these are the filters they use in their hoods. He tells me that for a filter that size, anything less then 1/4hp and rated at least at 1000 cfm, wouldn't produce an air stream at all, let alone a good one for sterile work. I'm torn now. Does anyone know anything about this company? Do they know what they're talking about when it comes to other things? How reliable their spores are? Anyone know more about flow hoods and air pressures that can put this issue to bed for me? Does everyone use furnace blowers and am I crazy for wanting to use an inline centrifugal fan? I just want to grow mushrooms. It didn't used to be this hard. Thanks much!

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OfflinetaGyo
Strainiac/AMU
Male User Gallery


Registered: 10/16/14
Posts: 18,802
Loc: Journal Land Flag
Last seen: 5 years, 6 months
Re: A question about air movement [Re: Cisco47723]
    #21226488 - 02/04/15 03:33 PM (9 years, 3 months ago)

Paragraphs are nice.

Here's for anyone trying to read that block of text:

Quote:

Cisco47723 said:
SO over the past couple of months I've attempted to get back into the fungus game because it was something I used to be good at. Several attempts have shown me the techniques of the past are done, and it is time to move on to a more professional standard, meaning, it's time for a flowhood and culture work. Now, all the guides I've read about it (The Stamets Book, Evil Mushroom's, and http://www.fungifun.org/English/Flowhood) all used the same formula which would place me at about needing a 24" x 24" x 6" hepa filter with around 1" of static pressure and a fan capable of producing 400 cfm.

In my city, I'm sure it isn't much different anywhere else, the only local places that carry exactly those filters that I and any other mycologist need are places that serve businesses, offices, or industrial applications, and give a cold shoulder to anyone looking for "home use". So I figured I had to buy one online. Now, the best place when taking reliability, cost, and sketchiness into account is Earth's Tongue. They have a 24x24x6 for a grand total of about 200 USD (http://www.earthstongue.com/product/24_x_24_x_6_HEPA_FILTER_REPLACEMENT). But when I called the place to find out about static pressure of the filter, I start asking him some questions since this is a website that advertises that these are the filters they use in their hoods.

He tells me that for a filter that size, anything less then 1/4hp and rated at least at 1000 cfm, wouldn't produce an air stream at all, let alone a good one for sterile work. I'm torn now. Does anyone know anything about this company? Do they know what they're talking about when it comes to other things? How reliable their spores are? Anyone know more about flow hoods and air pressures that can put this issue to bed for me? Does everyone use furnace blowers and am I crazy for wanting to use an inline centrifugal fan? I just want to grow mushrooms. It didn't used to be this hard. Thanks much!




--------------------
Gyo's Better Grows
TNF Q&A :rockon:
AMU Q&A

Dominus fortunae meae sum

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Offlinekrypto2000
Unknown


Registered: 12/05/06
Posts: 11,579
Last seen: 4 years, 6 months
Re: A question about air movement [Re: taGyo]
    #21226552 - 02/04/15 03:50 PM (9 years, 3 months ago)

I would go with a centrifugal fan (furnace/squirrel cage/etc) because they are designed to work under high static pressure as opposed to an inline fan. I'm not saying an inline will not work, but it's not ideal and will probably be more difficult to find specs for.

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InvisiblePirateSwazey
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Registered: 12/12/12
Posts: 2,993
Loc: Here, Now
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Re: A question about air movement [Re: krypto2000]
    #21228691 - 02/04/15 11:20 PM (9 years, 3 months ago)

Yeah a blower is what you want, not an inline fan. An inline will do the job
but they are more of a pain in the ass to install than a squirrel cage blower.

There are lots of filters on eBay (Flanders brand or Astrocell). I bought my
filter from a company called filterab2b. Another good place to look for filters
is on Paul Stamets's website.

My advice on a fan is figure out an estimate of how much CFM you will need
to push your filter and overshoot it a little bit. This way you know you have
enough power to meet laminar flow and you can choke the fan down with
pre filters or a speed controller to dial it in.


--------------------
 

BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


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Offlinecamplo
Freedom!


Registered: 02/10/08
Posts: 1,675
Last seen: 2 years, 7 months
Re: A question about air movement [Re: PirateSwazey]
    #21229059 - 02/05/15 01:59 AM (9 years, 3 months ago)

Focus on finding fans that are 1/3hp or higher, then research the specs best you can. I got one off of craigslist for 35 dollars. Guy pulled it out of a furnace and even had a cord rigged up so I could operate all the speeds. I researched the motor and found that most 1/3hp furnace blowers are about perfect for a 24x24x6...#mytwocents


--------------------
:three:

Edited by camplo (02/05/15 01:59 AM)

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OfflineCisco47723
El Capitane
Male
Registered: 02/14/13
Posts: 9
Loc: Northwest Territory
Last seen: 8 years, 9 months
Re: A question about air movement [Re: camplo]
    #21229116 - 02/05/15 02:53 AM (9 years, 3 months ago)

I think I'm starting to understand. A filter such as this http://www.ebay.com/itm/AAF-Astrocel-1-NUCLEAR-GRADE-Clean-Room-HEPA-Air-Filter-24x24x11-5-1000-CFM-New-/141409505339?pt=LH_DefaultDomain_0&hash=item20eca9d03b

When it says rated at 1000 cfm at 1.0 in w.g., that means that is the highest possible airflow that this filter will push out, not how much air has to be passing through it in order for it to go through at all?

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OfflineFodo
Stranger
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Registered: 10/19/14
Posts: 89
Last seen: 8 years, 9 months
Re: A question about air movement [Re: Cisco47723]
    #21229359 - 02/05/15 06:24 AM (9 years, 3 months ago)

Most squirrel cage fans from furnaces have 3 or 4 speeds. You can choose the speed you want through different combinations of the wires coming from the motor. The white wire is normally the common wire and is a little thicker than the other wires.

When you purchase, look for multiple colored wires coming from the motor, the number of colors other than the white wire will tell you how many speeds there are.

Look up the furnace you got the fan from and there will normally be a diagram, (i.e.) white and red is low, white and blue is medium. Cap the wires you are not using.

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OfflineFodo
Stranger
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Registered: 10/19/14
Posts: 89
Last seen: 8 years, 9 months
Re: A question about air movement [Re: Fodo]
    #21229373 - 02/05/15 06:33 AM (9 years, 3 months ago)

On another note, if you get a single speed fan, you can change the pulley sizes on the motor and fan to slow down the airflow to the cfm you require, normally a smaller pulley on the motor and a larger pulley on the fan. This will require some experimenting. Plumbing stores carry a variety of pulleys.

A good place to get a squirrel cage fan is metal recyclers, the furnace installers take used furnaces there.

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OfflineFodo
Stranger
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Registered: 10/19/14
Posts: 89
Last seen: 8 years, 9 months
Re: A question about air movement [Re: Fodo]
    #21229393 - 02/05/15 06:42 AM (9 years, 3 months ago)

For hepa filters I used 3 "Garrison" replacement filters that I purchased from the hardware store. They cost me about $30.00 Canadian each. The filters are about 12 x 15 inches. They work great and are a good value, I get virtually no contams when working under the hood.

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InvisiblePirateSwazey
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Registered: 12/12/12
Posts: 2,993
Loc: Here, Now
Trusted Cultivator
Re: A question about air movement [Re: Cisco47723]
    #21229877 - 02/05/15 10:22 AM (9 years, 3 months ago)

Quote:

Cisco47723 said:
When it says rated at 1000 cfm at 1.0 in w.g., that means that is the highest possible airflow that this filter will push out, not how much air has to be passing through it in order for it to go through at all?




:bigyesnod:


--------------------
 

BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


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