Home | Community | Message Board


This site includes paid links. Please support our sponsors.


Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Jump to first unread post Pages: 1
Some of these posts are very old and might contain outdated information. You may wish to search for newer posts instead.
OfflineVTsal
Stranger
Registered: 05/22/16
Posts: 51
Last seen: 2 years, 6 months
HEPA Question - 150 microns?
    #23483856 - 07/27/16 09:14 PM (7 years, 7 months ago)

Hi Everyone - I'm looking at buying a HEPA listed on the internet.  It says it's a Camfil Farr Megalam panel. 

Minimum efficiency 99.99
WG .86
FPM 150
CFM 493
Micron 150

Why is the micron number so high?  Shouldn't it be more like .3?  I'm confused.  If anyone can explain this, I'd appreciate it. 
Thanks.

Extras: Filter Print Post Top
OfflinePsilosopherr
A psilly goose
Other User Gallery


Registered: 02/15/12
Posts: 12,278
Last seen: 2 months, 10 days
Re: HEPA Question - 150 microns? [Re: VTsal]
    #23483994 - 07/27/16 09:53 PM (7 years, 7 months ago)

:popcorn: I've been confused by this too. Far as I can tell the only number you need to worry about is the 99.99% but hopefully somebody comes along to clarify.

Extras: Filter Print Post Top
Invisiblemicelio
Song of Silence
 User Gallery

Registered: 04/22/14
Posts: 1,547
Re: HEPA Question - 150 microns? [Re: Psilosopherr]
    #23484186 - 07/27/16 11:22 PM (7 years, 7 months ago)

This filter is the standard filter that people seem to go with:
24x24x5.8 Filter info: HEPA-SEP
Model STD 242405PEADC50
584 @ 1.0" max. w.G. Pressure Drop
DOP .010max
99.99% Efficient
.3 micron

http://www.fungi.com/product-detail/product/24-x-24-x-58-micron-filter.html


--------------------
     

Extras: Filter Print Post Top
OfflineGr0wer
always improving
Male


Registered: 09/16/03
Posts: 6,056
Loc: El Paso, TX Flag
Last seen: 5 years, 11 months
Trusted Cultivator
Re: HEPA Question - 150 microns? [Re: micelio]
    #23484215 - 07/27/16 11:38 PM (7 years, 7 months ago)

yea 99.999 at 150 micron isn't shit. I believe .5 micron is as big as you want to go.

Extras: Filter Print Post Top
OfflineVTsal
Stranger
Registered: 05/22/16
Posts: 51
Last seen: 2 years, 6 months
Re: HEPA Question - 150 microns? [Re: Gr0wer]
    #23484673 - 07/28/16 06:37 AM (7 years, 7 months ago)

OK, thanks.  I'll keep looking.  Might have to go with Funji so at least I know I'm getting the right thing. 

I still don't understand why there is such a big difference in the micron numbers between this HEPA and all the other HEPAs I looked at.

Extras: Filter Print Post Top
Offlinechefjrd
Strangerer

Registered: 05/20/16
Posts: 87
Last seen: 7 years, 5 months
Re: HEPA Question - 150 microns? [Re: VTsal]
    #23484865 - 07/28/16 08:23 AM (7 years, 7 months ago)

This is the filter suggested by gr0wer when he built his flow hood.

http://www.ebay.com/itm/231550223754?redirect=mobile

Im currently debating whether to buy one now as there's 3 left.

Extras: Filter Print Post Top
OfflineVTsal
Stranger
Registered: 05/22/16
Posts: 51
Last seen: 2 years, 6 months
Re: HEPA Question - 150 microns? [Re: chefjrd]
    #23484946 - 07/28/16 08:47 AM (7 years, 7 months ago)

Yes - I saw that, thanks.  The thing about that one is the WG is .45.  Isn't that too low?  I thought the minimum acceptable WG is .86.  I was under the impression that a filter with a low WG would not have enough resistance and the air would be coming through the filter too fast.  It wouldn't pass the Bic lighter test as the flame would be blown out.  Am I wrong?
Thanks

Extras: Filter Print Post Top
Offlinechefjrd
Strangerer

Registered: 05/20/16
Posts: 87
Last seen: 7 years, 5 months
Re: HEPA Question - 150 microns? [Re: VTsal]
    #23485031 - 07/28/16 09:15 AM (7 years, 7 months ago)

:confused:

I dunno. Hopefully Gr0wer will chime in again. I think he's still using the same filter and it's the one in his videos.

Extras: Filter Print Post Top
OfflineGr0wer
always improving
Male


Registered: 09/16/03
Posts: 6,056
Loc: El Paso, TX Flag
Last seen: 5 years, 11 months
Trusted Cultivator
Re: HEPA Question - 150 microns? [Re: chefjrd]
    #23485166 - 07/28/16 10:02 AM (7 years, 7 months ago)

People overthink the whole hepa setup, close is good enough. With a pre filter your around .8. One of my hoods flows 250ft/min and one 120. Id much rather work in front of my 250 ft/min because it feels much nicer to have a breeze cool me down.

Extras: Filter Print Post Top
OfflinePsilosopherr
A psilly goose
Other User Gallery


Registered: 02/15/12
Posts: 12,278
Last seen: 2 months, 10 days
Re: HEPA Question - 150 microns? [Re: chefjrd]
    #23485225 - 07/28/16 10:22 AM (7 years, 7 months ago)

Quote:

chefjrd said:
This is the filter suggested by gr0wer when he built his flow hood.

http://www.ebay.com/itm/231550223754?redirect=mobile

Im currently debating whether to buy one now as there's 3 left.



that is a pretty good deal from what I've seen. tempting

Extras: Filter Print Post Top
OfflineVTsal
Stranger
Registered: 05/22/16
Posts: 51
Last seen: 2 years, 6 months
Re: HEPA Question - 150 microns? [Re: Psilosopherr]
    #23485326 - 07/28/16 10:55 AM (7 years, 7 months ago)

So the resistance value of .8 to 1 you're aiming for is the combined resistance of the HEPA and the prefilter.  Of course - it makes sense and I should have figured that out on my own.  That's very helpful, thanks.

Extras: Filter Print Post Top
Jump to top Pages: 1


Similar ThreadsPosterViewsRepliesLast post
* Found source of cheap HEPA filters with blowers ... ragadinks 2,410 2 10/26/03 09:25 AM
by ragadinks
* Agaricus question from someone who cant afford reading ;) kykeon 2,568 15 08/22/02 04:10 AM
by kykeon
* Where to get cheap oyster spores? (+oyster questions) NFNF 5,874 11 10/11/03 06:07 PM
by gordonoalberto23
* Portabella Questions BigBlackNinja 3,078 11 08/04/04 01:53 AM
by NextKind
* filter disc apprehension *DELETED* MeetMeInEleusis 1,329 5 11/27/03 12:52 PM
by creekfarmer
* A question that needz an answer... please? :) kykeon 2,092 14 12/13/02 04:48 PM
by viscid
* Willow waste question?(Salix) G a n j a 2,212 12 12/11/02 07:20 PM
by G a n j a
* A. blazei mycelium question Mr. Fryd 2,570 7 06/25/01 05:06 PM
by Azure

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: RogerRabbit, Pastywhyte, Forrester, Stromrider, SHROOMSISAY01
350 topic views. 3 members, 5 guests and 3 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Copyright 1997-2024 Mind Media. Some rights reserved.

Generated in 0.023 seconds spending 0.004 seconds on 12 queries.