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OfflineRaadt
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Flowhood construction questions
    #1198131 - 01/07/03 03:36 PM (14 years, 14 days ago)

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,


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


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Anonymous

Re: Flowhood construction questions [Re: Raadt]
    #1198905 - 01/07/03 08:15 PM (14 years, 14 days ago)

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 :grin:). 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

Re: Flowhood construction questions [Re: ]
    #1198915 - 01/07/03 08:18 PM (14 years, 14 days ago)

Let me know when you are done so I can come over and pour some more plates :grin:.


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OfflineAnnoA
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Re: Flowhood construction questions [Re: Raadt]
    #1198996 - 01/07/03 09:00 PM (14 years, 14 days ago)

FAQ, Raadt, FAQ... :wink:

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 09:03 PM)


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OfflineRaadt
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Re: Flowhood construction questions [Re: Anno]
    #1199035 - 01/07/03 09:32 PM (14 years, 14 days ago)

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.


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


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OfflineAnnoA
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Re: Flowhood construction questions [Re: Raadt]
    #1199046 - 01/07/03 09:36 PM (14 years, 14 days ago)

>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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OfflineRaadt
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Re: Flowhood construction questions [Re: Anno]
    #1199064 - 01/07/03 09:48 PM (14 years, 14 days ago)

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?


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


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OfflineAnnoA
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Re: Flowhood construction questions [Re: Raadt]
    #1199094 - 01/07/03 10:04 PM (14 years, 14 days ago)

I?m using a 2 ft x 1 ft HEPA with 99.997 efficiency and 1" static pressure, a furnace prefilter 1ft x 1ft and a duct fan Systemair RVK 160E2-L1 .
http://www.systemair.com/ny/download/doc/catalogue/RVK.pdf

Pictures of the hepa:
http://fungifun.50megs.com/hepa_new/

The blower is attached to it via a hose.

Another possibility is a hood utilizing a commercial air cleaner:

http://fungifun.50megs.com/hepa/

Also read:
http://www.shroomery.org/forums/showflat.php?Cat=&Board=Forum4&Number=798916

and
http://www.shroomery.org/forums/showflat.php?Cat=&Board=Forum4&Number=828995

and
http://www.shroomery.org/forums/showflat.php?Cat=&Board=Forum4&Number=542014


Edited by Anno (01/07/03 10:19 PM)


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Invisiblei am e goldstein
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Post deleted by Administrator [Re: Raadt]
    #1199133 - 01/07/03 10:31 PM (14 years, 14 days ago)



--------------------
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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OfflineRaadt
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Re: Flowhood construction questions [Re: Anno]
    #1199157 - 01/07/03 10:51 PM (14 years, 14 days ago)

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?


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


Edited by Raadt (01/07/03 10:55 PM)


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OfflineAnnoA
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Re: Flowhood construction questions [Re: i am e goldstein]
    #1199161 - 01/07/03 10:53 PM (14 years, 13 days ago)

You?d need a Variable Motor Speed Control though to alter the fan speed...


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OfflineAnnoA
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Re: Flowhood construction questions [Re: Raadt]
    #1199169 - 01/07/03 10:57 PM (14 years, 13 days ago)

>how you have it set inside your filter.

You can see it here

www.fungifun.org/flowhood


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OfflineRaadt
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Re: Flowhood construction questions [Re: Anno]
    #1199182 - 01/07/03 11:03 PM (14 years, 13 days ago)

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.


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


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Re: Flowhood construction questions [Re: Raadt]
    #1199189 - 01/07/03 11:06 PM (14 years, 13 days ago)

>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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Re: Flowhood construction questions [Re: Raadt]
    #1199194 - 01/07/03 11:08 PM (14 years, 13 days ago)



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OfflineRaadt
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Re: Flowhood construction questions [Re: Anno]
    #1199196 - 01/07/03 11:09 PM (14 years, 13 days ago)

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.  :grin: 


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


Edited by Raadt (01/07/03 11:13 PM)


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OfflineRaadt
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Re: Flowhood construction questions [Re: Anno]
    #1199202 - 01/07/03 11:11 PM (14 years, 13 days ago)

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.


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


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OfflineAnnoA
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Re: Flowhood construction questions [Re: Raadt]
    #1199231 - 01/07/03 11:24 PM (14 years, 13 days ago)

No, no, no...the last post in that thread....


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InvisibleRoadkill
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Re: Flowhood construction questions [Re: Raadt]
    #1199259 - 01/07/03 11:34 PM (14 years, 13 days ago)

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


--------------------
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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OfflineRaadt
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Re: Flowhood construction questions [Re: Roadkill]
    #1199636 - 01/08/03 06:43 AM (14 years, 13 days ago)

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.


--------------------
Raadt

-- The information I provide is only information from readings, growing of gourmet mushrooms, and second hand stories--


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Amazon Shop for: HEPA Filter, Laminar Flow Hood, Paul Stamets, Petri Dish

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