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Invisibleshobimono
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Registered: 09/14/04
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flow hood questions
    #6159183 - 10/11/06 05:20 PM (17 years, 7 months ago)

While researching flow hood parts it appears there are various choices, and the price range can be quite considerable.

99.97 vs 99.99 hepa - does it matter for myco (agar) work? ie are you going to get a higher contam rate with the 99.97 vs the 99.99?

11 1/2 vs 5 7/8 hepa width - does thicker just last longer? and/or require a larger blower? again does it matter which size is chosen when it comes to myco (agar) work?

blowers - Since there will be a plenum, does it matter if the blower's output hole is 6" circular hole versus say a rectangular 6"x5" hole?

If I'm going to use a 24x24 hepa, will a 600 cfm blower be enough? or does that depend on the efficiency and width of the hepa?

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Invisibleohmatic
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Re: flow hood questions [Re: shobimono]
    #6160887 - 10/12/06 03:01 AM (17 years, 7 months ago)

99.97 is fine its h14 and thats what u want.
thick lasts longer, yeah, and it needs a larger blower aswell.

mine is less than 3 inches thick and works a charm.
you NEED a plenum anyway, output hole doesnt matter.
and yes the blower must be matched with the hepa in order to get it working properly.

look here: http://www.fungifun.org/English/Flowhood


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OfflineAnnoA
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Re: flow hood questions [Re: ohmatic]
    #6165008 - 10/13/06 08:46 AM (17 years, 7 months ago)

Quote:

99.97 is fine its h14 and thats what u want.




H14 is ~99.995
H13 is ~99.97

Quote:

thick lasts longer, yeah, and it needs a larger blower aswell.




A thicker filter has more internal surface area, thus its static pressure is less, and thus it needs a smaller blower.

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Invisibleohmatic
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Re: flow hood questions [Re: Anno]
    #6165018 - 10/13/06 08:50 AM (17 years, 7 months ago)

listen to the man he knows his stuff :smile:


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OfflineAnnoA
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Re: flow hood questions [Re: shobimono]
    #6171397 - 10/15/06 10:34 AM (17 years, 7 months ago)

Here is a table:


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OfflineRogerRabbitM
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Re: flow hood questions [Re: Anno]
    #6171438 - 10/15/06 10:49 AM (17 years, 7 months ago)

Can you give us a bit of help understanding that table? What is penetration, and the difference between local and integral value?
RR


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Invisibleshobimono
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Re: flow hood questions [Re: Anno]
    #6171473 - 10/15/06 11:04 AM (17 years, 7 months ago)

Ok, so the 99.99% it is.
If the 11 1/2" filter requires a smaller blower than the 5 7/8" filter, would it be better to spend more money to get the 11 1/2" filter since you would save a bit on a smaller blower? and the thicker filter should last longer correct?

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OfflineAnnoA
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Re: flow hood questions [Re: RogerRabbit]
    #6171682 - 10/15/06 12:28 PM (17 years, 7 months ago)

Penetration is 1 - "collection efficiency". It's how many particles come through.
The integral value is the mean collection efficiency over the whole filter, whereas a local collection efficiency can be somewhat smaller on some points of the filter.
Read:
http://www.airtesters.com/EN_1822.pdf http://www.filterair.info/articles/article.cfm/ArticleID/AF070432-A633-4988-8CADEAB1C335E48A/Page/1
http://www.filterair.info/articles/article.cfm/ArticleID/0DF747E5-FB6F-4C7A-BB6BED1B6B64C65E/Page/1

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OfflineAnnoA
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Re: flow hood questions [Re: shobimono]
    #6171692 - 10/15/06 12:32 PM (17 years, 7 months ago)

>would it be better to spend more money to get the 11 1/2" filter since you would
>save a bit on a smaller blower

Depends on the cost of both and on the actual static pressure of the filter. Read the link in the first reply about how to match a blower to a filter.

>the thicker filter should last longer correct?

Yes.

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Offlinehyphae
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Re: flow hood questions [Re: Anno]
    #6172765 - 10/15/06 05:45 PM (17 years, 7 months ago)

IME The standard works just fine and will last a life time for our purposes as long as the prefilters are changes accordingly over the high capacity (11 1/2"). Bottom line don't waste your money on the thicker one.


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OfflineAnnoA
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Re: flow hood questions [Re: hyphae]
    #6174072 - 10/16/06 01:10 AM (17 years, 7 months ago)

>Bottom line don't waste your money on the thicker one.

That's true.

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Invisibleshobimono
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Re: flow hood questions [Re: Anno]
    #6174221 - 10/16/06 03:55 AM (17 years, 7 months ago)

Is the particle size the filter's efficiencies are based on an industry standard? or are they arbitrarily chosen by the manufacturer?

In this thread
http://www.shroomery.org/forums/showflat.php?Cat=0&Board=Forum4&Number=5593032

Anno says "Yes, it is a HEPA, class H14, 99.997% efficiency up to 0.12 micrometers particle size."

Fungifun has a link
http://cgi.ebay.com/_W0QQitemZ7570567276QQrdZ1QQcmdZViewItem

that shows that filter was tested at .26 microns (this is twice as big as what Anno mentions)

I was looking at some 99.99% hepa filters tested at .30 microns (this is two and a half times larger than what Anno mentions)

That seems to be quite a variance between different filters. Does it matter whether they tested at .12, .26 or .3? or are those sizes so small that it doesn't matter?

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OfflineRogerRabbitM
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Re: flow hood questions [Re: shobimono]
    #6174382 - 10/16/06 07:26 AM (17 years, 7 months ago)

Nothing but a virus is smaller than .3 that will effect your cultures, but virii are also smaller than .12 so it won't help to spend more.
RR


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