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: PhytoExtractum Maeng Da Thai Kratom Leaf Powder   Bridgetown Botanicals Bridgetown Botanicals   Left Coast Kratom Buy Kratom Extract   Kraken Kratom Red Vein Kratom   North Spore North Spore Mushroom Grow Kits & Cultivation Supplies

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Some of these posts are very old and might contain outdated information.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.
Offliner.xavier2
Stranger

Registered: 08/20/15
Posts: 4
Last seen: 8 years, 4 months
need help choosing a HEPA/blower combo
    #22118302 - 08/20/15 07:48 PM (8 years, 5 months ago)

Hello everyone! long time lurker here,  I recently ran into some money and decided to construct a flowhood to make my life easier and decrease my contam rate.

I found a brand new astrocel I HT500 on Ebay for 120$ with shipping, It's 24"x24"x12". Ideally i'd like to build one a bit smaller and with a 6" depth but this one is the best deal I can find.

http://www.ebay.com/itm/NEW-ASTROCEL-I-1000CFM-CLEAN-ROOM-HEPA-FILTER-24X24X12-/360960905857?hash=item540af25281

searching around on various mushroom forums i've found alot of people that have bought from the same Ebay supplier. The only problem is the page doesn't list the efficiency,  I found an astrocel I product brochure online and it says that the HT500 is 99.97% while the HT500 SCANNED is 99.99%,but I dont know which one this is. I'm sure someone on here has bought this same filter, I was wondering if it is infact a 99.97% would that be strong enough to give me a virtually 0% contam rate?

I'd really like to hear from someone who bought the same one. Is 99.97% enough or do those 3ug make a big difference? Would an old 1/4 HP furnace blower produce the 400cfm required to make it flow? I'm having alot of difficulty finding the data sheets.


Edited by r.xavier2 (08/20/15 07:54 PM)


Extras: Filter Print Post Top
Invisibleblindingleaf
blue collar underworld
 User Gallery

Registered: 07/19/13
Posts: 22,008
Loc: sub-surface unseen
Trusted Cultivator
Re: need help choosing a HEPA/blower combo [Re: r.xavier2]
    #22118453 - 08/20/15 08:26 PM (8 years, 5 months ago)

the 400cfm calculation ur assuming is based on if ur filter has 1" of static pressure (w.G.)

the filter you bought lists .4" SP/W.G.

99.97% is ok for our uses.  all HEPA's are made to be 99.99%.  but if they fail the filter test post production, it gets a 99.97% rating. but its negligible.


i don't have experience with .4" W.G. or 12" thick HEPA's, so I'm not sure i know the best route to take.  Damion5050 has a build with a 12", and i think i remember other build with thick HEPA's too, but don't remember the names.  check those out, and pay attention to their fan speeds and plenum sizes.

the reason u got it cheap is because 12" HEPA are mass produced way more than 6".  there are way more hospital clean rooms in the U.S./world than mushrooms labs/hobbyists.


--------------------
A few thoughts on cultivation
MICROBIAL HUSBANDRY!!!!

The whole is greater than the sum of its parts


Extras: Filter Print Post Top
Offliner.xavier2
Stranger

Registered: 08/20/15
Posts: 4
Last seen: 8 years, 4 months
Re: need help choosing a HEPA/blower combo [Re: blindingleaf]
    #22118554 - 08/20/15 08:47 PM (8 years, 5 months ago)

Quote:

blindingleaf said:
the 400cfm calculation ur assuming is based on if ur filter has 1" of static pressure (w.G.)

the filter you bought lists .4" SP/W.G.





what's the required CFM then? :frown:

the area is 2ftx2ft = 4ft²
then i did the 100ft per minute times 4ft² equals 400ft³/min or 400CFM
since the SP is 0.4" my blower must deliver 400CFM at the static pressure of 0.4"

Is there something I'm missing there? pretty sure I did the math right.

Also where did you get the 0.4"? I see on the ebay page one of the pictures has some scribbles on the label under resistance that looks like a .4 but that can't be right, that's a really low quality pic. it must be a .9


Edited by r.xavier2 (08/20/15 08:52 PM)


Extras: Filter Print Post Top
Invisibleblindingleaf
blue collar underworld
 User Gallery

Registered: 07/19/13
Posts: 22,008
Loc: sub-surface unseen
Trusted Cultivator
Re: need help choosing a HEPA/blower combo [Re: r.xavier2]
    #22118652 - 08/20/15 09:05 PM (8 years, 5 months ago)

it looks like a .4" to me :shrug:

like i said, i don't have experience with low water gate filters.

reduced SP means its easier for air to exit out of the filter.  if its easier to exit out, laminar flow across face of filter is harder to achieve if u want a MINIMUM of 100FPM off the face.

in most cases, u want more.  when my lighter bends 60-90 degrees, the meter i use always reads less than 100FPM.

edit: sorry, it reads below 150 FPM with 90 bend no flicker.

this is what mine looks like the way i built it, and works fine.  the flame bends at 90, but it flickers a bit.  but it flickers the same way across face of filter.


--------------------
A few thoughts on cultivation
MICROBIAL HUSBANDRY!!!!

The whole is greater than the sum of its parts


Edited by blindingleaf (08/20/15 09:21 PM)


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

Shop: PhytoExtractum Maeng Da Thai Kratom Leaf Powder   Bridgetown Botanicals Bridgetown Botanicals   Left Coast Kratom Buy Kratom Extract   Kraken Kratom Red Vein Kratom   North Spore North Spore Mushroom Grow Kits & Cultivation Supplies


Similar ThreadsPosterViewsRepliesLast post
* Some help with HEPA/blower specs? Sma 406 1 03/29/12 06:58 PM
by Sma
* Will this Lasko blower work for a laminar flowhood? asymetricaljoe 548 6 08/20/09 09:02 AM
by xeallos
* PLEASE HELP WILL THIS BLOWER WORK?
( 1 2 all )
rjreynoldsinc 2,594 26 01/21/12 02:42 PM
by Wrath
* HEPA flow rates please Archosargus 558 6 01/03/12 11:25 PM
by Archosargus
* blower for my HEPA filter, PLEASE HELP!!! FGL 2,439 13 10/09/05 02:35 PM
by Prisoner#1
* Flowhood Build-- blower HORSEPOWER RATINGS??? SKrink 2,472 14 07/01/13 02:14 PM
by eelrd72
* Blower recommandation ? Need 510 m3/hour at 300 Pa! wise_gardener 2,937 18 06/12/07 04:52 PM
by rungi
* Please help, what kind of blower do i need for my HEPA filter? omu_negru 578 3 07/20/10 10:21 AM
by Mad_Hatter2004

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, Stipe-n Cap, Pastywhyte, bodhisatta, Tormato, Land Trout, A.k.a
322 topic views. 33 members, 194 guests and 38 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 0.02 seconds spending 0.008 seconds on 14 queries.