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OfflineDeadPhan
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Registered: 05/05/04
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Which filter should i get? Thicker or thinner?
    #16376164 - 06/13/12 01:25 PM (11 years, 8 months ago)

ive been trying for a while now to try to figure out how to build a flowhood.  im seriously horrible at math so, im pretty much still far off at understanding how to match up a blower to a filter, so im just gonna get myself a filter, and try to get a friend or some friends over to help me figure it out.  altho, before i get a filter, i was wondering, i guess it would be smarter for me to get the thinner of the 2?  If i got the thinner one, wouldnt i in turn have to get a less expensive blower? 
there is this one..  http://www.ebay.com/itm/NEW-GENUINE-AAF-INTERNATIONAL-ASTROCEL-II-CLEAN-ROOM-AIR-FILTER-564X564X93MM-/150789666830?pt=LH_DefaultDomain_0&hash=item231bc3b80e

and this one.  http://www.ebay.com/itm/NEW-ASTROCEL-I-HEPA-CLEAN-ROOM-FILTER-24-X-24-X-12-AAF-560-480-001-/221001171070?pt=LH_DefaultDomain_0&hash=item3374b2407e

thats 9 inches difference in thickness, correct?  also, would i get less life or not as reliable performance from the thinner one?  sorry guys, im super new at the flowhood stuff, and my brain is mush from not doing much math over the years aside from real basic shit.  any info or advice so greatly appreciated!


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Big Gulps!  Alright!  Well,  See ya later!
And if i claim to be a wise man, well, it surely means that i dont know!


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OfflineMycJunkie
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Re: Which filter should i get? Thicker or thinner? [Re: DeadPhan]
    #16376316 - 06/13/12 02:02 PM (11 years, 8 months ago)



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OfflineDeadPhan
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Re: Which filter should i get? Thicker or thinner? [Re: MycJunkie]
    #16376435 - 06/13/12 02:30 PM (11 years, 8 months ago)

Quote:

MycJunkie said:
http://www.filtera-b2b.com/businessfilters/hepa.htm#99.99wood





so are you saying there is something wrong with the ones i was looking to buy?  considering they are half the price, if they do the job, id much rather go with them.


--------------------
 


Big Gulps!  Alright!  Well,  See ya later!
And if i claim to be a wise man, well, it surely means that i dont know!


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OfflineDeadPhan
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Re: Which filter should i get? Thicker or thinner? [Re: DeadPhan]
    #16376753 - 06/13/12 03:48 PM (11 years, 8 months ago)

anyone...anyone?  bueller?


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Big Gulps!  Alright!  Well,  See ya later!
And if i claim to be a wise man, well, it surely means that i dont know!


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InvisibleEvilMushroom666
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Re: Which filter should i get? Thicker or thinner? [Re: DeadPhan]
    #16376949 - 06/13/12 04:43 PM (11 years, 8 months ago)

Do not bump your own threads within 24 hours of your last post please. Any further bumps
will result in locked threads.

I think I remember posting this the other day to your thread:

Quote:


    Specs of two HEPA's to choose from:

    Tri-Pure HEPA
    Standard Cap model

    Recommended Airflow = 250FPM(1.25 m/sec)
    Resistance
    12" deep @ 250 FPM = 1" W.G (250 Pascals)
    6" deep @ 125 FPM  = 1" W.G (250 Pascals)


    A=24"X24" = 576 Square inches
    576/144= 4 square feet

    4 square feet X 250FPM = 1000 CFM 12" deep filter
    4 square feet X 125FPM = 500 CFM  6"  deep filter


    RR Note:
    Some of the newer HEPA filters flow higher than we want at 1" of
    static pressure.  In these cases, you need to run at a lower static
    pressure, because you really don't want more than 100 feet per minute
    leaving your hood.

    Based on the specs above, I'd go with the 6" deep filter because it
    has higher resistance.  The resistance is what helps achieve laminar
    flow by creating pressure on the back side of the filter.  If every
    inch of the back side is under pressure, the air flows smoothly out
    the front side.

    I'd go with the 6" filter and a blower rated at 450 cfm @ 1" W.G.








Taken from:
https://www.shroomery.org/forums/showflat.php/Number/13851289#13851289

I would ask for a data sheet on both those filters, there is not enough information in my
opinion to make an informed decision.


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OfflineDeadPhan
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Re: Which filter should i get? Thicker or thinner? [Re: EvilMushroom666]
    #16377096 - 06/13/12 05:15 PM (11 years, 8 months ago)

ok...thanks.  im still a little confused tho.  i will request a data sheet in that case, however, it seems that what you just sent me, suggests getting a smaller depth is better.  just wondering if 3 inches is too small?  also, looking at the pictures, it looks like the 3 inch depth filter doesnt have the metal face like the 12 inch deep one.  does that mean anything?


--------------------
 


Big Gulps!  Alright!  Well,  See ya later!
And if i claim to be a wise man, well, it surely means that i dont know!


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InvisibleEvilMushroom666
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Re: Which filter should i get? Thicker or thinner? [Re: DeadPhan]
    #16377115 - 06/13/12 05:21 PM (11 years, 8 months ago)

The first one looks like a filter for a clean room, and while it may work it is not optimal.

The second one is a standard looking filter but does not list the filtration, resistance, etc
all information you want to know.

My personal opinion?:

Do not be cheap with your flow hood. Trying to save a few dollars on a piece of equipment
that will last 10+ years if built and maintained properly seems silly to me. Also note that
when purchasing a filter from e-bay you are taking a huge risk. Time and time again vendors
send damaged filters, used filters, do not package it properly so it gets ruined while being
shipped, etc. A HEPA filter is a fragile thing, and not everyone knows how to handle and
package them.

I would buy from a trusted company (that way if it gets damaged they will make things right).
You will pay a little more but you will get exactly what you want and need, and you only have
to pay for it once. My filter was the highest cost in my build, $218 dollars but I am now
set for 10+ years.



I would look at the link above that Myc posted, or try to contact Tri-Dim directly for a
quote.


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OfflineDeadPhan
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Re: Which filter should i get? Thicker or thinner? [Re: EvilMushroom666]
    #16377203 - 06/13/12 05:43 PM (11 years, 8 months ago)

right on thanks.  i just emailed the seller on ebay at least for the specs, and am still considering looking elsewhere.  however, tri-dim says they can take up to 3 weeks to deliver.  i guess i can wait that long, but i realy wana get started asap.  anyhoo, do you think 24x24 is too big?  im basically planning on using my flowhood for innoculations as well as G2G's.  Id like to work with bags, but, proly not a necessity either.  would 12x24 just as well suffice for the time being.  considering that im just starting out and whatnot.  i hope to build my way up and get bigger, and do have a friend that wants to help me out....so i was thinkin 24X24 just so over time i can double, if not triple and so on the workspace and realy get things cookin.  but, if its feasible to get something realy reliable first off with less surface area maybe ill go that route and get a trusted filter from trusted source for a lil less than bigger from the same.  only reason im considering such cheap vendors as well as bigger filters is cause i figure i might as well go as big as i can off the bat.  but if its not feasible for a while, i guess ill reconsider.


--------------------
 


Big Gulps!  Alright!  Well,  See ya later!
And if i claim to be a wise man, well, it surely means that i dont know!


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InvisibleEvilMushroom666
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Re: Which filter should i get? Thicker or thinner? [Re: DeadPhan]
    #16377230 - 06/13/12 05:48 PM (11 years, 8 months ago)

Roger Rabbit uses a 1X2 foot filter to run all the grain and substrate for a large scale
shiitake farm. He also uses spawn bags.

I built a 2X2' filter personally and it works great for everything I do, but weighs a ton
and I need two people to move it. In the future I plan on building a smaller portable hood
in the range of 1X2'.

Here is a link to my build:
https://www.shroomery.org/forums/showflat.php/Number/13454470#13454470


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OfflineDeadPhan
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Re: Which filter should i get? Thicker or thinner? [Re: EvilMushroom666]
    #16382666 - 06/14/12 07:54 PM (11 years, 8 months ago)

i requested a data sheet.  this is what they sent me.  http://www.aafintl.com/Products/HEPA%20Filtration/Filters/AstroCel%20I/AstroCel%20I%20High%20Capacity/High%20Capacity%20Wood%20Sides%20Non%20Scanned.aspx#.T9qTq8WcHIV
is there anyway to figure out resistance from these specs?  also...is the fact that there is no header an issue?  im real sorry for the 20 questions.  i realy just cant wrap my head around alot of this.  im hoping to get some help from friends soon enough, but untill then, here is all i got.  Again, i really appreciate the advice!


--------------------
 


Big Gulps!  Alright!  Well,  See ya later!
And if i claim to be a wise man, well, it surely means that i dont know!


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OfflineDeadPhan
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Registered: 05/05/04
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Re: Which filter should i get? Thicker or thinner? [Re: DeadPhan]
    #16382679 - 06/14/12 08:00 PM (11 years, 8 months ago)

there is also this...   
Standard High Capacity
Operating AstroCel I AstroCel I HCX
Comparison 24" x 24" x 111/2" 24" x 24" x 111/2"
Rated Airflow Capacity 1450 CFM 2000 CFM
@ 1.4 in. w.g. (350 Pa) initial resistance (2465 m3/hr.) (3400 m3/hr.)
Rated Airflow Capacity 1050 CFM 1500 CFM
@ 1.0 in. w.g. (250 Pa) initial resistance (1785 m3/hr.) (2550 m3/hr.)
Service Life Ratio 1.0 2.0
@ 1000 CFM (1700 m3/hr.)

taken from this....  http://www.aafintl.com/Products/HEPA%20Filtration/Filters/AstroCel%20I/AstroCel%20I%20High%20Capacity/~/media/product%20media/documents/Air%20Filter/Literature/astrocel%20i%20afp%201%20110%20pdf.ashx


--------------------
 


Big Gulps!  Alright!  Well,  See ya later!
And if i claim to be a wise man, well, it surely means that i dont know!


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