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OfflineGr0wer
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Whats a good source for hepa filters?
    #2757879 - 06/02/04 08:04 PM (13 years, 3 months ago)

Im looking for a good cheap hepa filter for a flow hood

Would this one work?

http://www.bionaire.com/eStore/product.aspx?CatalogId=1&CategoryId=1084&ProductId=7854

Someone should make a flow hood section on the shroomery guide. Have a list of some filters and links to flowhood posts and pictures.


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InvisibleYidakiMan
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Re: Whats a good source for hepa filters? [Re: Gr0wer]
    #2758000 - 06/02/04 08:48 PM (13 years, 3 months ago)

Buy filters off eBay for a deal.


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OfflinePsilygirl
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Re: Whats a good source for hepa filters? [Re: YidakiMan]
    #2758004 - 06/02/04 08:50 PM (13 years, 3 months ago)

Quote:

YidakiMan said:
Buy filters off eBay for a deal.




thats how I got mine. make sure it's a HEPA though, there's alot of look-a-likes they try and rip you off for. read carefully!


--------------------
"Love says 'I am everything.' Wisdom says 'I am nothing.' Between the two, my life flows."


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OfflineGr0wer
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Re: Whats a good source for hepa filters? [Re: Psilygirl]
    #2758159 - 06/02/04 09:45 PM (13 years, 3 months ago)

I'll keep an eye on ebay. Thanks!


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InvisibleYidakiMan
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Re: Whats a good source for hepa filters? [Re: Psilygirl]
    #2759218 - 06/03/04 01:46 AM (13 years, 3 months ago)

I agree. Be absolutely sure that the filter you are buying is rated at 99.97% or 99.99% efficiency of filtration down to .3 microns.

Filters that have only 30% efficiency at 10 microns are sold with HEPA on the label.
Go to your local hardware or home supercenter and you will see how many "fake" HEPA filters there are out there.

Buyer Beware indeed.


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Offlinemycoguy
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Re: Whats a good source for hepa filters? [Re: Gr0wer]
    #2759479 - 06/03/04 04:03 AM (13 years, 3 months ago)

I went to a Thift Store and bought a HEPA air cleaner. Of course it needed a new filter, so i picked that up at the hardware store.

Check Walmart. Last time I was there, they had a small Holmes for about $30.


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Offlinescatmanrav
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Re: Whats a good source for hepa filters? [Re: Gr0wer]
    #2761440 - 06/03/04 10:54 PM (13 years, 3 months ago)

Just picked a true HEPA air cleaner with filter (supposedly almost new) for 1 buck plus 20 S&H..


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OfflineGr0wer
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Re: Whats a good source for hepa filters? [Re: scatmanrav]
    #2761791 - 06/04/04 12:19 AM (13 years, 3 months ago)

I just bought a used hepa unit off ebay for $5, but thats for me. I also got a connection and im geting 2 of these for $50 shipped :laugh: , contact the guy if you want any, he has lots, there military surplus.  http://cgi.ebay.com/ws/ebayISAPI.dll?Vie...=3817889932>


Edited by Gr0wer (06/04/04 12:20 AM)


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OfflineTweexican
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Re: Whats a good source for hepa filters? [Re: Gr0wer]
    #2765438 - 06/05/04 05:06 AM (13 years, 3 months ago)

250 cfm at 20%


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OfflineGr0wer
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Re: Whats a good source for hepa filters? [Re: Tweexican]
    #2766452 - 06/05/04 04:40 PM (13 years, 3 months ago)

yea thats for my filter right? 2 of them should be more then enough for for a 1'x2' flowhood.


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InvisibleTripsAreForKids
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Re: Whats a good source for hepa filters? [Re: Gr0wer]
    #2774362 - 06/08/04 12:04 PM (13 years, 3 months ago)

I think I'm gonna ride this out with you gr0wer, maybe you've already done the math in which case check mine.  :wink:

Somebody correct me if I'm wrong, but here goes my half asleep math for finding out what blower would be needed for two of these filters side by side.

Using the information here, http://www.fungifun.org/flowhood/match.htm , though substituting the 100cfm airflow recommendation with the current 150cfm recommendation from stamets.

2*1 = 2' sq ft * 150 = 300'^3 airflow needed.  So 300cfm at whatever pressure.

The ebay item says 1.1 static pressure in the posting, but says .8 on the actual item.. Has me a bit perplexed... We'll use the manufacturers info instead.  Here's the link - http://www.aafintl.com/eprise/main/AAF_Intl/airfilter/hepa . Looking at the pdf brochure, it says the 5 7/8ths version is 1" WG .  Also confirms the 150CFM recommendation from stamets, as opposed to the 125 listen on the ebay auction.  :confused:

Still not sure which specs to use, are the specs listed on the ebay images actual test data, or.... (no idea)

Okay, so 1", factor in another .2" for prefilter, 1.2" WG.  ... Pretty convenient that every bit of this math fits the fungifun information.. So we need a blower that puts out 300CFM at 300PA/1.2" .

Looking around on ebay, I've seen lots of "Elicent" inline duct fans that look like they'd work.  Here's the page for the Elicent fans. - http://www.elicent.it/inglese/axcmet.html

Looking at the spec sheets for those we can see the curves for each model.

Being that the graphs are in cubic meters, convert the 300 to meters, 300*1.7=510M^3

Quick rundown on reading the graphs, check the
left PA column, find 300 and follow to the right, along the line.  If it drops before the lower scale reaches 510, it's too weak of a fan.

Check out the AXC 250A model's graph, looks like it tapers off right around 550 cubic meters...  The elicent fans are damn expensive, but it's just an example I used for showing my thinking process.

Am I on the right track as to selecting a blower?


--------------------
Everything posted above was out of fun, none should be taken serious. I am currently under the influence so take that into consideration.


Edited by TripsAreForKids (06/08/04 12:13 PM)


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OfflineAnnoA
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Re: Whats a good source for hepa filters? [Re: TripsAreForKids]
    #2774437 - 06/08/04 12:45 PM (13 years, 3 months ago)

Yes, you are.

>the current 150cfm recommendation from stamets.

Where did you read this?


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InvisibleTripsAreForKids
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Re: Whats a good source for hepa filters? [Re: Anno]
    #2774579 - 06/08/04 01:54 PM (13 years, 3 months ago)

Somewhere in the archives of mycotopia, in the flowhood/glovebox section. Not sure if I read it from a reliable source, though. Let me find the post and I'll link you to it.


Edit: Here's the post - http://www.mycotopia.net/discus/messages/5/53132.html , information was posted by username SkyPilot.
Quote:

A couple of points. Paul now recommends a minimum flow rate of 150 feet per minute. That has been increased since TMC was published.






Also, another question... If the airflow is higher than needed, is there any less filtration? Any detrimental effects? Like say 200cfm as opposed to the 150cfm rating. The article (presumably written by you?), says +20%, but has anyone actually screwed anything up by going too powerfull?


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Everything posted above was out of fun, none should be taken serious. I am currently under the influence so take that into consideration.


Edited by TripsAreForKids (06/08/04 02:21 PM)


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OfflineGr0wer
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Re: Whats a good source for hepa filters? [Re: TripsAreForKids]
    #2774750 - 06/08/04 02:50 PM (13 years, 3 months ago)

Thanks for the help! But I think ill just throw 2 daytons on it that i already have, then move up from there. I just need something cheap that gets the job done for a few mycobags, not a fine tuned machine. After a bulk grow ill invest in a better fan and build a plexy flowhood. But for now its those 12x12x11 filters i got off ebay for $50, some plywood paint and 2 ~125 cfm daytons.


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InvisibleTripsAreForKids
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Re: Whats a good source for hepa filters? [Re: Gr0wer]
    #2774764 - 06/08/04 02:57 PM (13 years, 3 months ago)

Did you get the 11" depth ones? Or the 5 7/8ths?  Same filtration, 5 bucks more for the slimmer ones, though.  Keep in mind if the initial CFM rating for those blowers is 125, you're not going to push near enough air through with 1" static pressure.

I think Loki's iguana has been sealing the bags before pressure cooking.  Shouldn't the air escape from the filtration square, instead of popping the bag?  Only thing to really worry about is sucking dirty air in through the patch when taking it out of the pressure cooker when warm... But then again the filter's suppose to.. filter stuff.  :tongue:

Might not need a flowhood, I may go with a cheap room hepa filter and a soon to be home made vinyl plastic/pvc positive pressure glovebox for culturing and other sterile work.


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Everything posted above was out of fun, none should be taken serious. I am currently under the influence so take that into consideration.


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OfflineGr0wer
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Re: Whats a good source for hepa filters? [Re: TripsAreForKids]
    #2774814 - 06/08/04 03:18 PM (13 years, 3 months ago)

Well id rather not seal then first so i can do G2G, then again i can go to liqid myc, but then id have to change my teks and i like G2G because you can see the growth your transfering so you can pick teh best jar. Also i heard they pop.

Also i have a nice pyrex petri set and would like to put it to some good use :laugh:

I already made a positive pressure glovebag and it works great but visiblity isnt that great and id rather have laytex gloves then big clumsy gloves. And keeping it sterile and cleaning it is annoying.



(the fan is removed for my 70w hps salvia,hbw,wormwood,catnip,san pedro grow cab)

I got the 11" ones military surplus through ebay but i contacted and bought them out of ebay for cheaper, http://cgi.ebay.com/ws/ebayISAPI.dll?Vie...=3817889932>


Edited by Gr0wer (06/08/04 03:22 PM)


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OfflineAnnoA
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Re: Whats a good source for hepa filters? [Re: TripsAreForKids]
    #2774816 - 06/08/04 03:18 PM (13 years, 3 months ago)

>If the airflow is higher than needed, is there any less filtration?
There is a point for every filter where the filtration is at its optimum.

> Any detrimental effects? Like say 200cfm as opposed to the 150cfm rating

Yes. You want LAMINAR flow coming from the filter. If the flow is too fast, you get a turbulent flow, which means that you get turbulences behind your sterile objects in front if the filter, so the dirty air can get back to your sterile object and contaminate it.

I would stay at the 100 fpm. I never saw a recommendation by Stamets or anyone else to use a higher speed for horizontal laminar flow hoods.

If you look here, at a professional flow hood producer:
http://www.cleanzones.com/detail.cfm?id=1
they have
"Airflow- Average measured clean air velocity 90 fpm (+/- 10fpm). "

I'd stick with what the professionals use.


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InvisibleTripsAreForKids
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Re: Whats a good source for hepa filters? [Re: Anno]
    #2774946 - 06/08/04 04:01 PM (13 years, 3 months ago)

Ok, 100ft it is.  Thanks for the info.  :smile:


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Offlinedebianlinux
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Re: Whats a good source for hepa filters? [Re: TripsAreForKids]
    #2777211 - 06/09/04 09:15 AM (13 years, 3 months ago)

Quote:

TripsAreForKids said:
Shouldn't the air escape from the filtration square, instead of popping the bag?




No Try squeezing a sealed filter patch bag... hard... real hard, now... see how you can't feel any pressure drop?

The filters allow gaseous exchange on a micron level.

Sealed bags can be PC'd if precautions are taken to prevent expanding, contact with the sides, and exhaust blockage. Methods for doing this have been discussed ad nauseum.


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Re: Whats a good source for hepa filters? [Re: debianlinux]
    #2779653 - 06/10/04 12:30 AM (13 years, 3 months ago)

I've never tried or owned any of the bags. My pet monkey will be doing a bunch of bulk growing using them, so just trying to get everything sorted before investing money. Thanks for the info, I've gathered that the flowhood is pretty much needed.

Has anyone done an incubator/floowhood combination? Maybe blowing heated sterile air? or would that fuck up the laminar aspect? Maybe a heatpad/blanket under the surface...


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Everything posted above was out of fun, none should be taken serious. I am currently under the influence so take that into consideration.


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