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!

Shop: OlympusMyco.com We’re Not Chasing Unicorns—We’re Building Quality (Olympus Myco Grow Bags)   Kraken Kratom Red Vein Kratom

Jump to first unread post Pages: < Back | 1 | 2 | 3 | Next >  [ show all ]
Some of these posts are very old and might contain outdated information. You may wish to search for newer posts instead.
OfflineMushroomWizard420
mycological magician
Male


Registered: 04/03/14
Posts: 307
Loc: space Flag
Last seen: 2 years, 8 months
Re: Flow hood help [Re: MushroomWizard420]
    #20616481 - 09/25/14 11:12 AM (10 years, 3 months ago)

and depth doesn't matter at all, it just affects the resistance of the filter, but we can clearly see the filter is rated at 1.3" resistance (depth included...) you just need static pressure and efficiency rating from the filter, buying the fan is when you need to worry about matching static pressure with cfm.


--------------------
"And on the last day, God purchased RogerRabbit's DVD set, and learned to grow mushrooms. And it was good."
-Shroomesis 4:20

                                  :supershroom: :supershroom: :supershroom: :kingtard::supershroom: :supershroom: :supershroom:
                                  :poison: MushroomWizard420 :poison:
                                              :shroomin:
                               
          The spirit of the forest watches over his children as they grow...

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: starsky7]
    #20616487 - 09/25/14 11:13 AM (10 years, 3 months ago)

EBay dude. And not all clean room filters will provide laminar flow due to resistance.

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: Ghatti]
    #20616509 - 09/25/14 11:18 AM (10 years, 3 months ago)

But I see filters with different rated cfm listed on them, what is this? If its a 2x2 filter how will the cfm needed differ between a filter rated 1000cfm and one rated 500cfm?

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: Ghatti]
    #20616514 - 09/25/14 11:19 AM (10 years, 3 months ago)

Is there a minimum resistance I must have in the filter? And especially to keep from spending 500 on a blower.

Extras: Filter Print Post Top
OfflineMushroomWizard420
mycological magician
Male


Registered: 04/03/14
Posts: 307
Loc: space Flag
Last seen: 2 years, 8 months
Re: Flow hood help [Re: Ghatti]
    #20616657 - 09/25/14 11:50 AM (10 years, 3 months ago)

filters don't have cfm ratings, they have set static pressures that are determined by how much airflow they allow through them. filters are used to test cfm on fans, and fans are used to test static pressure on filters (don't quote me on that, i'm sure they have some fancier scientific ways of doing it, i'm just making a point). a filter doesn't produce any cfm, but if you have it's static pressure, you can use that to determine how much cfm you will need from your fan. but you're skipping the first step..
what is the cfm you will need? so we're on the same page and can talk specifics instead of generalities.


--------------------
"And on the last day, God purchased RogerRabbit's DVD set, and learned to grow mushrooms. And it was good."
-Shroomesis 4:20

                                  :supershroom: :supershroom: :supershroom: :kingtard::supershroom: :supershroom: :supershroom:
                                  :poison: MushroomWizard420 :poison:
                                              :shroomin:
                               
          The spirit of the forest watches over his children as they grow...

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: MushroomWizard420]
    #20616673 - 09/25/14 11:54 AM (10 years, 3 months ago)

I haven't purchased a filter yet so to be determined.  The second pic for instance is rated 330cfm @ 1wg

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: Ghatti]
    #20616679 - 09/25/14 11:56 AM (10 years, 3 months ago)

So does this mean I would need a slightly larger than 330cfm fan for prefilter etc? What static pressure am I aiming for?

Extras: Filter Print Post Top
OfflineSockadin
Male User Gallery


Registered: 01/03/10
Posts: 7,266
Last seen: 1 month, 21 days
Trusted Cultivator
Re: Flow hood help [Re: Ghatti]
    #20616696 - 09/25/14 11:59 AM (10 years, 3 months ago)

So I made the mistake of ordering a smaller blower and it blows. Going to have to upgrade when payday comes. Do the math. It is important.

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: Sockadin]
    #20616722 - 09/25/14 12:04 PM (10 years, 3 months ago)

So I found a static pressure of 1 is acceptable I believe. So if that filter is rated at 330cfm @ 1wg then all I really need to figure out is what my prefilter will affect correct?

But also on the filter it states RES drop 0.61wg @ 90fpm

What the shit is this? I know we want about 100fpm exiting the filter so is this saying I will only have .61wg on the filter or less at 100fpm?

Edited by Ghatti (09/25/14 12:04 PM)

Extras: Filter Print Post Top
OfflineMushroomWizard420
mycological magician
Male


Registered: 04/03/14
Posts: 307
Loc: space Flag
Last seen: 2 years, 8 months
Re: Flow hood help [Re: Ghatti]
    #20616748 - 09/25/14 12:11 PM (10 years, 3 months ago)

Quote:

Ghatti said:
But I see filters with different rated cfm listed on them, what is this? If its a 2x2 filter how will the cfm needed differ between a filter rated 1000cfm and one rated 500cfm?



i just noticed that you gave me the info i just asked for. use the same math i did for mine because we have the same surface area, so your numbers are
440-480 CFM @ 1.5" static pressure
now, ignoring anything about the filter for now, you need to look for a fan with one of those charts that shows that at 1.5" static pressure the fan produces anywhere from 440 to 480 CFM. better to overshoot and go for something around 500 CFM than something closer to 400 CFM because you can always add another pre filter.
Quote:

Ghatti said:
So does this mean I would need a slightly larger than 330cfm fan for prefilter etc? What static pressure am I aiming for?



ideally something around 1.0" static pressure, but as long as it has a high enough efficiency (99.97%+) then it should be fine theoretically. you just might have to put more effort into finding a proper fan


--------------------
"And on the last day, God purchased RogerRabbit's DVD set, and learned to grow mushrooms. And it was good."
-Shroomesis 4:20

                                  :supershroom: :supershroom: :supershroom: :kingtard::supershroom: :supershroom: :supershroom:
                                  :poison: MushroomWizard420 :poison:
                                              :shroomin:
                               
          The spirit of the forest watches over his children as they grow...

Extras: Filter Print Post Top
OfflineMushroomWizard420
mycological magician
Male


Registered: 04/03/14
Posts: 307
Loc: space Flag
Last seen: 2 years, 8 months
Re: Flow hood help [Re: MushroomWizard420]
    #20616762 - 09/25/14 12:13 PM (10 years, 3 months ago)

static pressure is no more important than anything else, all the factors are important in achieving the end result of laminar flow (even flow of air at 100 FPM). if your static pressure is super high you'll just need a super strong fan, it's that simple.


--------------------
"And on the last day, God purchased RogerRabbit's DVD set, and learned to grow mushrooms. And it was good."
-Shroomesis 4:20

                                  :supershroom: :supershroom: :supershroom: :kingtard::supershroom: :supershroom: :supershroom:
                                  :poison: MushroomWizard420 :poison:
                                              :shroomin:
                               
          The spirit of the forest watches over his children as they grow...

Extras: Filter Print Post Top
Offlinestarsky7
The Sponge
Male User Gallery


Registered: 09/12/14
Posts: 860
Loc: Eastern coast, USA Flag
Last seen: 8 years, 7 months
Re: Flow hood help [Re: Sockadin]
    #20616856 - 09/25/14 12:32 PM (10 years, 3 months ago)

Quote:

Sockadin said:
So I made the mistake of ordering a smaller blower and it blows.



lol


--------------------
"In nature, there are neither rewards nor punishments, there are consequences" - Robert Greene Ingersoll

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: Ghatti]
    #20616863 - 09/25/14 12:34 PM (10 years, 3 months ago)

Ok so I just looked at a filter. It said wg 0.15, test flow 1000cfm.

How would you adapt this down to have 1wg? Or does this filter just have too high of a flow? What I'm asking is am I looking for a filter with a 1wg rating it close to it?

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: Ghatti]
    #20616965 - 09/25/14 12:52 PM (10 years, 3 months ago)

Ok so here's a rundown on the filter specs Efficiency: 99.9995% @ 0.12 Microns
Rated CFM: 330 @ 1.0 W.G
Press. Drop: .61 W.G @ 90 FPM

So its roughly 3.4sq ft, times 100 = 340, times 1.2 adjusting for prefilter and the like = 408cfm.

Right?

So basically I'd look for a blower that was rated at least 400 under 1wg of static pressure?

Extras: Filter Print Post Top
Offlinetombosley8
Full on... Bossley Baggins
 User Gallery


Registered: 10/14/13
Posts: 3,660
Last seen: 6 months, 13 days
Re: Flow hood help [Re: MushroomWizard420]
    #20616987 - 09/25/14 12:55 PM (10 years, 3 months ago)

basically you want a filter that has a high resistance somewhere around 1" (Static pressure) at the cfm of the the square feet of your filter face x 100(this allows 100 ft per minute exiting the entire filter face which is what we describe as laminar flow). So a filter with a 2x2 face should have a tested airflow around 400+ cfm at around 1" S.P. The thicker the filter the less resistance, and though many still achieve success with the 12 in filters the 6 in filters have better specs for achieving laminar flow IMO(more resistance = more even flow out the filter). So once you have the filter you just want to find a blower that will deliver at least the tested airflow under the static pressure of the filter + prefilter + 10%-20%. So the blower for a 2x2 filter with a tested airflow of 400 cfm at 1" S.P. needs to deliver at least 400 cfm at 1.3-1.5 S.P.(filter-1"  prefilter-.2"  additional 10-20%-.1"-.3").  More is better than less.  If your blower is too much you can use a speed dimmer to adjust. You can't make a lesser blower enough as sock has found out the hard way. Do your homework before you fork it out. I payed twice as much for my first hood as my current one and it was half the size. I just wasn't exactly sure what to look for so i just ordered from fungiperfecti to be sure i had the right specs. Once you know what you need you can find it pretty easy. Filtera.com is great for filters grainger and zorotools for blowers and sometimes ebay for both.


--------------------

Edited by tombosley8 (09/25/14 01:02 PM)

Extras: Filter Print Post Top
OfflineMushroomWizard420
mycological magician
Male


Registered: 04/03/14
Posts: 307
Loc: space Flag
Last seen: 2 years, 8 months
Re: Flow hood help [Re: tombosley8]
    #20617011 - 09/25/14 12:57 PM (10 years, 3 months ago)

Quote:

tombosley8 said:
basically you want a filter that has a high resistance somewhere around 1" (Static pressure) at the cfm of the the square feet of your filter face x 100(this allows 100 ft per minute exiting the entire filter face which is what we describe as laminar flow). So a filter with a 2x2 face should have a tested airflow around 400+ cfm at around 1" S.P. The thicker the filter the less resistance, and though many still achieve success with the 12 in filters the 6 in filters have better specs for achieving laminar flow IMO(more resistance = more even flow out the filter). So once you have the filter you just want to find a blower that will deliver at least the tested airflow under the static pressure of the filter + prefilter + 10%-20%. So the blower for a 2x2 filter with a tested airflow of 400 cfm at 1" S.P. needs to deliver at least 400 cfm at 1.3-1.5 S.P.(filter-1"  prefilter-.2"  additional 10-20%-.1"-.3").  More is better than less.  If your blower is too much you can use a speed dimmer to adjust. You can't make a lesser blower enough.




everything i was saying, but more concise. :whathesaid:


--------------------
"And on the last day, God purchased RogerRabbit's DVD set, and learned to grow mushrooms. And it was good."
-Shroomesis 4:20

                                  :supershroom: :supershroom: :supershroom: :kingtard::supershroom: :supershroom: :supershroom:
                                  :poison: MushroomWizard420 :poison:
                                              :shroomin:
                               
          The spirit of the forest watches over his children as they grow...

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: tombosley8]
    #20617017 - 09/25/14 12:58 PM (10 years, 3 months ago)

I do believe I have it. Anyone double check that quick math?

So when even looking at/for filters I generally want to find one with 1wg to beging with correct?

Extras: Filter Print Post Top
Offlineblojo02184
Big Red
Male User Gallery


Registered: 05/15/13
Posts: 3,527
Loc: Maine
Last seen: 6 months, 21 days
Re: Flow hood help [Re: Ghatti]
    #20617026 - 09/25/14 01:00 PM (10 years, 3 months ago)

it's not wg that your looking for... its static pressure (sp) or if your European pascals.
wg is usually referring to pressure drop.

http://www.pureairsystems.com/Pure-Air-University-103-Filtrat1.html
everything about a filter you need to know.
including how static pressure is determined.

Extras: Filter Print Post Top
OfflineMushroomWizard420
mycological magician
Male


Registered: 04/03/14
Posts: 307
Loc: space Flag
Last seen: 2 years, 8 months
Re: Flow hood help [Re: Ghatti]
    #20617027 - 09/25/14 01:00 PM (10 years, 3 months ago)

Quote:

Ghatti said:
Ok so here's a rundown on the filter specs Efficiency: 99.9995% @ 0.12 Microns
Rated CFM: 330 @ 1.0 W.G
Press. Drop: .61 W.G @ 90 FPM

So its roughly 3.4sq ft, times 100 = 340, times 1.2 adjusting for prefilter and the like = 408cfm.

Right?

So basically I'd look for a blower that was rated at least 400 under 1wg of static pressure?



where did you get 3.4? i thought you were looking at 2x2, so 4ft2


--------------------
"And on the last day, God purchased RogerRabbit's DVD set, and learned to grow mushrooms. And it was good."
-Shroomesis 4:20

                                  :supershroom: :supershroom: :supershroom: :kingtard::supershroom: :supershroom: :supershroom:
                                  :poison: MushroomWizard420 :poison:
                                              :shroomin:
                               
          The spirit of the forest watches over his children as they grow...

Extras: Filter Print Post Top
InvisibleGhatti
Totally not a Federal Agent
 User Gallery
Registered: 06/23/14
Posts: 1,733
Re: Flow hood help [Re: MushroomWizard420]
    #20617036 - 09/25/14 01:02 PM (10 years, 3 months ago)

Sorry I thought I had put this in there

Size: 20.5" x 20.5" x 3.25"

Extras: Filter Print Post Top
Jump to top Pages: < Back | 1 | 2 | 3 | Next >  [ show all ]

Shop: OlympusMyco.com We’re Not Chasing Unicorns—We’re Building Quality (Olympus Myco Grow Bags)   Kraken Kratom Red Vein Kratom


Similar ThreadsPosterViewsRepliesLast post
* flow hoods matching blower with filter is this right? greenshaman 5,287 10 04/22/18 09:08 AM
by bodhisatta
* Hepa type filter - flow hood - cheap & easy
( 1 2 all )
SixTango 16,959 25 04/09/02 11:14 AM
by rebelmoon
* Could I use these to build a flow hood/filter thinger? NFNF 1,845 4 05/09/03 04:26 PM
by calicyco
* Flow hood question newuser1492 3,461 7 02/20/05 11:12 PM
by Newf
* Flow hood design for your approval dickmcplentie 2,892 5 07/08/03 03:06 PM
by Anno
* Correct airflow on flow hood SafeHaven 1,934 3 06/10/03 02:35 PM
by FungusmaximusFM
* flow hood Psychoslut 2,824 19 02/06/04 04:56 AM
by ImOver18
* 6' Laminar Hepa unit Suggestions for flow hood construction 95rh 4,432 7 01/07/04 07:08 AM
by 95rh

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: Shroomism, george castanza, RogerRabbit, veggie, mushboy, fahtster, LogicaL Chaos, 13shrooms, hamloaf, cronicr, Stipe-n Cap, Pastywhyte, bodhisatta, Tormato, Land Trout, A.k.a
3,224 topic views. 18 members, 91 guests and 10 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Copyright 1997-2025 Mind Media. Some rights reserved.

Generated in 0.032 seconds spending 0.008 seconds on 13 queries.