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 Raadt
nicht
Registered: 06/07/02
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 Flowhood construction questions 
#1198131 - 01/07/03 01:36 PM (21 years, 8 months ago) |
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A few questions, as i'm beginning construction of my flowhood.
a. Is there any need for a prefilter? What material should be used?
b. can the CFM be too high for said HEPA. i.e. if i have a ~950CFM blower, is that too high for a 12x24 HEPA figuring .8" static pressure? recommended is over 495.
c. How sterile do conditions around the flow need to be maintained at, in order to be able to consistantly work in open space? not very?
thanks in advance,
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Anonymous
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Re: Flowhood construction questions [Re: Raadt]
#1198905 - 01/07/03 06:15 PM (21 years, 8 months ago) |
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a. A pre filter is a VERY good idea. It will trap hair, dust, ect.. befpre it gets to your spendy HEPA. Inline furnace filters are usually used and can be stacked.
b. Yes I think the CFM can be too high for flow hood work (especialy if it blows your petri dish covers onto the ground  ). If you get a dual condenser motor you can vary fan speed. Your Ideal fan/motor set up would be one capable of 200cfm @ .8" Static pressure (according to TMC).
c. As far as the steril conditions, as long as you are inside the air flow of the hood you should not get any airborne contams. If you have dirty hands or tools, that's a different story.
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Anonymous
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 Re: Flowhood construction questions [Re: ]
#1198915 - 01/07/03 06:18 PM (21 years, 8 months ago) |
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Let me know when you are done so I can come over and pour some more plates .
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,167
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Re: Flowhood construction questions [Re: Raadt]
#1198996 - 01/07/03 07:00 PM (21 years, 8 months ago) |
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FAQ, Raadt, FAQ... 
http://shroomery.org/faq/faq.php?display=faq&nr=163&catnr=8&prog=1&lang=en
A prefilter in form of a furnace filter(basically a woven polyester, some 2 inches thick) is a good thing to have.
b. You can always make the prefilter thicker to limit the overall output.
c. Not very, I have my filter in my bedroom.
A link of interest:
http://www.fungifun.org/flowhood/
Edited by Anno (01/07/03 07:03 PM)
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Raadt
nicht
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Re: Flowhood construction questions [Re: Anno]
#1199035 - 01/07/03 07:32 PM (21 years, 8 months ago) |
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I read that but got somewhat confused, I was attempting to work with numbers I simply do not have yet, because I am only tenatively looking at blowers (on ebay). The information they provide is very minimal, and I haven't even begun to look at filters. This is a very early post.
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Anno
Experimenter
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Posts: 24,167
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Re: Flowhood construction questions [Re: Raadt]
#1199046 - 01/07/03 07:36 PM (21 years, 8 months ago) |
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>The information they provide is very minimal
That?s often the problem with second hand blowers...
www.grainger.com provides the necessary data for their blowers.
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Raadt
nicht
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Posts: 2,107
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Re: Flowhood construction questions [Re: Anno]
#1199064 - 01/07/03 07:48 PM (21 years, 8 months ago) |
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I think I will be forced to buy second hand, i'm a starving grad student ;p I emailed the people selling the items for more information, hopefully someone can give me something pertainant. Which blower/filter are you using?
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Anno
Experimenter
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Posts: 24,167
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Re: Flowhood construction questions [Re: Raadt]
#1199094 - 01/07/03 08:04 PM (21 years, 8 months ago) |
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Edited by Anno (01/07/03 08:19 PM)
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 i am e goldstein
Your Friend
Registered: 12/06/02
Posts: 283
Loc: 4 Blocks from Ground Zero
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 Post deleted by Administrator [Re: Raadt]
#1199133 - 01/07/03 08:31 PM (21 years, 8 months ago) |
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--------------------
Who controls the past controls the future. Who controls the present controls the past.
3DSHROOMS is either clueless or the worlds biggest SCUMBAG
I lie and exagerate constantly... God Bless America!
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
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Re: Flowhood construction questions [Re: Anno]
#1199157 - 01/07/03 08:51 PM (21 years, 8 months ago) |
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I like the blower you use, how you have it set inside your filter (on the fungifun pictoral). Are they more expensive? this would be a savior as far as space goes. Also, what type of hosing did you use, for the newest one? the metal type?
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
Edited by Raadt (01/07/03 08:55 PM)
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Anno
Experimenter
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You?d need a Variable Motor Speed Control though to alter the fan speed...
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Anno
Experimenter
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Posts: 24,167
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Re: Flowhood construction questions [Re: Raadt]
#1199169 - 01/07/03 08:57 PM (21 years, 8 months ago) |
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>how you have it set inside your filter.
You can see it here
www.fungifun.org/flowhood
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
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Re: Flowhood construction questions [Re: Anno]
#1199182 - 01/07/03 09:03 PM (21 years, 8 months ago) |
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Do you have good results with the commercial filter box? That's really interesting, first time i've seen that.
I had looked at the filtersrx site earlier, and I think I will go with that filter, I suppose it will be easier to pick a blower once I have a filter anyways, paddo had the right idea, do build it first, then mount the blower.
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,167
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Re: Flowhood construction questions [Re: Raadt]
#1199189 - 01/07/03 09:06 PM (21 years, 8 months ago) |
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>Do you have good results with the commercial filter box?
Yes, I did, but it?s easyer to work in front of a hepa, since you have more space.
>paddo had the right idea, do build it first, then mount the blower.
Depends, the design of the box should depend on what type and size of the blower you need and want.
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Anno
Experimenter
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Posts: 24,167
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Re: Flowhood construction questions [Re: Raadt]
#1199194 - 01/07/03 09:08 PM (21 years, 8 months ago) |
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
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Re: Flowhood construction questions [Re: Anno]
#1199196 - 01/07/03 09:09 PM (21 years, 8 months ago) |
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For me smaller is better, I need 1ftx2ft for a working space. The filtersrx filter you chose in your pictoral suggestion was what i had looked at earlier, and probably will go with. So now I need to attempt to find a blower. This will probably be the more difficult part. I need something ~100US$, or lower. I cannot afford more than ~250 US, for the hood in total. Or I will be killed by an angry girlfriend.
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
Edited by Raadt (01/07/03 09:13 PM)
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
Loc: azurescending
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Re: Flowhood construction questions [Re: Anno]
#1199202 - 01/07/03 09:11 PM (21 years, 8 months ago) |
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Ah, yes - I did see that one. But as roadkill stated, the crating charge alone is 180$, i am on the west coast so there would be a shipping charge as well. I doubt I would be able to get it here for much cheaper than 500$ (if i was lucky). I am unfortunately not financially able atm, or that would be a definant addition to my home. hah.
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Anno
Experimenter
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Posts: 24,167
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Re: Flowhood construction questions [Re: Raadt]
#1199231 - 01/07/03 09:24 PM (21 years, 8 months ago) |
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No, no, no...the last post in that thread....
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Roadkill
Retired Shroomery Mod
Registered: 12/11/01
Posts: 22,674
Loc: Montana
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 Re: Flowhood construction questions [Re: Raadt]
#1199259 - 01/07/03 09:34 PM (21 years, 8 months ago) |
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Raadt,
I think Anno was talking about his last post in that thread.
I asked him to pick out the blower and filter to make it easier on people.
The filter and blower is a little over your buget...but not by much.
You might consider sending for the filter first since that will take 4 weeks...then buy the blower when you can afford it.
Blower and Filter matched up by Anno
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Laterz, Road
Who the hell you callin crazy?
You wouldn't know what crazy was if Charles Manson was eating froot loops on your front porch!
Brainiac said:
PM the names with on there names, that means they have mushrooms for sale.
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
Loc: azurescending
Last seen: 5 years, 4 months
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Re: Flowhood construction questions [Re: Roadkill]
#1199636 - 01/08/03 04:43 AM (21 years, 8 months ago) |
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Ah, ok - yeah. Those were also mentioned on the fungifun page. I think I am going to do exactly what you said road, and buy the filter, make the box, then when I can afford it, buy the blower.
Thanks for the help, i'll keep you guys updated elsewhere.
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
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Re: Flowhood construction questions [Re: Raadt]
#1200463 - 01/08/03 10:17 AM (21 years, 8 months ago) |
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One last thing you might consider is putting an UV-C lamp between the blower and the filter. Any 'nasties' that get trapped in the filter get killed quickly by the UV-C which also helps extend the life of your filter.
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Just another spore in the wind.
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
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Re: Flowhood construction questions [Re: Anno]
#1200503 - 01/08/03 10:26 AM (21 years, 8 months ago) |
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Anno, does the airflow change directions in your flowhood before it hits the filter? From this pictures, it doesn't appear so. If it does not, the air pressure will not be even across the filter causing one area of the filter to blowout before the rest. You really want to have the high pressure air from the blower enter from the top or side (relative to the filter), not from directly behind the filter.
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Just another spore in the wind.
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Anno
Experimenter
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Posts: 24,167
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Re: Flowhood construction questions [Re: Seuss]
#1200522 - 01/08/03 10:29 AM (21 years, 8 months ago) |
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>From this pictures, it doesn't appear so.
From which pictures exactly? I posted like 3 sets of pictures in this thread....
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
Loc: azurescending
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Re: Flowhood construction questions [Re: Seuss]
#1200534 - 01/08/03 10:31 AM (21 years, 8 months ago) |
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He stated that he had the air coming in through a tube, or piping. The blower is not directly mounted to the hole in the back.
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 23 days, 3 hours
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Re: Flowhood construction questions [Re: Anno]
#1200538 - 01/08/03 10:33 AM (21 years, 8 months ago) |
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This one:
http://fungifun.50megs.com/cgi-bin/i/hepa_new/DSCF0021.JPG
It looks like the hole directly behind the filter is where the air comes in... could just be my eyes crossing 
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Just another spore in the wind.
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Anno
Experimenter
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Posts: 24,167
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Re: Flowhood construction questions [Re: Seuss]
#1200556 - 01/08/03 10:39 AM (21 years, 8 months ago) |
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The hole is at the top, and the air hits the wooden frame, then goes down toward the filter.
Edited by Anno (01/08/03 10:40 AM)
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Alkaloids
3,4,5-trimethoxyphenethylamine
Registered: 11/15/98
Posts: 743
Loc: pubis mons
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Nice idea with the gauges. I wasn't aware that they could be gotten so cheap. Think I'll get one.
If you do get a multi-speed from Ebay you can probably make due without a rheostat as one of the speeds should get you within a nice operating range.
On the UV-C note. I have an extra fixture with bulb if someone is interested in trading or buying it. I managed to get 2 from a custom lighting manufacturer before they stopped making them.
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
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Re: Flowhood construction questions [Re: Anno]
#1200727 - 01/08/03 11:22 AM (21 years, 8 months ago) |
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Ahhh! I see it now... very nice!
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Just another spore in the wind.
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
Loc: azurescending
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Re: Flowhood construction questions [Re: Raadt]
#1203123 - 01/09/03 04:52 AM (21 years, 8 months ago) |
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For future reference for anyone looking for a blower.
Fungi perfecti (http://www.fungi.com) sells a variety.
All-Purpose Blower
115V/60Hz, 488 CFM free air delivery, 217 CFM at .8" static pressure. Draws 1.43 amps. A superb, multipurpose fan excellent for use in greenhouses, growing rooms, and for pushing air through small dimension micron filters. (12 x 12 inch and 24 x 12 inch HEPAs). Because of the attached split capacitor, a better operating efficiency is achieved.
FAN667 $169.00
1/2 Horsepower Blower
4-speed, 115V/60Hz blower, maximum 1,653 CFM at .8" static pressure. Draws 5.1 amps. A useful fan for delivering air into air circulation systems for growing rooms, spawn laboratories and incubation chambers. Also ideal for blowing air into 2 x 4 foot HEPA filters (use 2nd highest speed). Note: not for free air delivery. Must be used with at least .7" static pressure (all our HEPA filters are .8" static pressure).
FAN685 $419.00
FP's Universal Blower
This high-power, multi-purpose blower is the perfect choice for pushing air through our 24 x 18, 24 x 24 and 24 x 36 inch HEPA filters. Dual-voltage power supply operates at either 115 or 230V. Delivers 1,092 CFM at .8" static pressure (60Hz). Draws 8.6 amps @115V.
FAN831 $289.00
And their prices for HEPA's
High Efficiency Particulate Air (HEPA) Filters
Custom manufactured to FP's critical specifications, these scanned water resistant micron filters are stocked in six sizes and screen out all airborne contaminants down to .3 microns with a guaranteed efficiency of 99.99%. Individually scanned and tested for quality. These filters are used throughout the microbiological industry and by computer manufacturers, nuclear laboratories, photographers, and anywhere else clean air is a must.
MF1212 12 x 12 x 5.8 inches $89.95
MF2412 24 x 12 x 5.8 inches $129.95
MF2418 24 x 18 x 5.8 inches $159.95
MF2424 24 x 24 x 5.8 inches $229.95
MF3624 36 x 24 x 5.8 inches $289.95
MF4824 48 x 24 x 5.8 inches $349.95
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
Edited by Raadt (01/09/03 05:30 AM)
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,167
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Last seen: 1 month, 1 day
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Re: Flowhood construction questions [Re: Raadt]
#1203314 - 01/09/03 06:04 AM (21 years, 8 months ago) |
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Yes...but it?s far more expensive than Grainger or filersx .
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Raadt
nicht
Registered: 06/07/02
Posts: 2,107
Loc: azurescending
Last seen: 5 years, 4 months
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Re: Flowhood construction questions [Re: Anno]
#1203415 - 01/09/03 06:37 AM (21 years, 8 months ago) |
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All-Purpose Blower
115V/60Hz, 488 CFM free air delivery, 217 CFM at .8" static pressure. Draws 1.43 amps. A superb, multipurpose fan excellent for use in greenhouses, growing rooms, and for pushing air through small dimension micron filters. (12 x 12 inch and 24 x 12 inch HEPAs). Because of the attached split capacitor, a better operating efficiency is achieved.
FAN667 $169.00
that one is pretty much the same price, and exactly ~200CFM at .8", although with the prefilter it will end up being like 1.2", correct? Will that blower not be powerful enough?
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Raadt
-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,167
Loc: my room
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Re: Flowhood construction questions [Re: Raadt]
#1203721 - 01/09/03 08:25 AM (21 years, 8 months ago) |
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>Will that blower not be powerful enough?
You got it.
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blahblahblah
Mad Scientist
Registered: 10/24/01
Posts: 1,022
Loc: South America
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Re: Flowhood construction questions [Re: Anno]
#1203866 - 01/09/03 09:52 AM (21 years, 8 months ago) |
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ok I know this is a little off topic but here is something that I have been bidding for on ebay. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=3258&item=3103840908
My maximum bid was $50 and I had the auction but I think they person running the auction bid on them becuase my high bid wasnt high enough. The same person keeps buying them and then the guy runs the auction again. There is one up for auction currently, it is for five units. If anyone wants to bid on them let me know and I will go in on it with you.
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debianlinux
Myconerd - DBK
Registered: 12/09/02
Posts: 8,334
Loc: Over There
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Re: Flowhood construction questions [Re: blahblahblah]
#1206420 - 01/10/03 07:17 AM (21 years, 8 months ago) |
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Quote:
but I think they person running the auction bid on them becuase my high bid wasnt high enough.
possibly not because that is what a reserve price is for. if you really suspect this then report it to eBay and they will investigate it. sorry for the OT but it's good info for anyone on eBay.
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420M
Long Time Reader- First TimePoster
Registered: 10/29/02
Posts: 64
Last seen: 21 years, 6 months
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Re: Flowhood construction questions [Re: Raadt]
#1210100 - 01/11/03 04:56 PM (21 years, 8 months ago) |
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I made and used this flowhood for years. . ..
www.fungifun.org/flowhood
I moved to a new house - with a higher spore count and it doesnt seem to produce contaminate free substrates anymore.
Here is the one I built this week. I built it to be more 'enclosed' where I work - I hope it helps - BTW my prefilter is an automotive air filter for a truck.
http://www.nansnook.com/forum/index.php?act=ST&f=21&t=1704&s=3c4f4ed559a0e64d42b6420d1aebf5d2
Good Luck - 420M
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