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Offlinevikingsc
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Re: who wants a flowhood? [Re: dirt dweller]
    #19440367 - 01/18/14 11:40 PM (10 years, 1 month ago)

Quote:

dirt dweller said:
I have been HVAC for along time now, and have used my talents for this hobby.  I built a small flow hood similar to what you are try to achieve.  If you drop by your local heating and cooling repair shop you should be able to get a 1-2 ton blower motor, housing and squril cage for a case of beer.  Adjust the speed taps to the lowest speed and see how the flow is through the filter at 7-9" away from the face of the filter.  A lighter should either not stay lit or see signs of flame lifting.  I built my hood for about 50.00 not including the filter price.  Hopes this helps if you have any questions hit me back.  Dirt out...............




I've also been in HVAC for many years. Tinbashers unite!:laugh:

Spiralhaze I was wondering if you'd have to change anything for the static pressure being tested at 1000 CFM.


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OfflineRogerRabbitM
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Re: who wants a flowhood? [Re: vikingsc]
    #19441211 - 01/19/14 05:22 AM (10 years, 1 month ago)

If you don't know anything about flowhoods or HVAC, please listen and learn, but don't give bad advice.  Every single post you've made above without exception is incorrect.

The filter was tested at 1000 cfm and at that rate of flow, the static pressure which developed was .9" W.G.

That is an 11" filter, which has less resistance than thinner filters.  This is why we usually get 5" filters for flow hoods.  It's hard to get laminar flow with much less than 1" W.G. of pressurized air in the plenum.  Thicker filters were designed for clean room use where they need to pass much more air, thus they have less resistance, but more capacity to store filtered material.  Thinner filters are designed for flow bench work.  They're pressurized from behind so they'll deliver laminar airflow out the front.  They have higher resistance to help with laminar flow and because they're thinner, less debris holding capability. (use a good prefilter)

The motor specs you posted above are not sufficient to operate this filter.

Build the flow hood, leaving at least 8" of free space behind the filter.  This is the plenum where air from the blower will pressurize, thus placing an equal amount of air over the entire back surface of the filter.  This helps to achieve laminar flow out the front.

You want about 450 to 500 cfm(cubic feet per minute, a measure of volume) blowing through the filter to get a speed of 100 to 125 fpm(feet per minute, a measure of air speed).  I suspect with that filter, you'll achieve the desired flow with a resistance of around .5 or so.  Find a 500 cfm blower at .5" to .7" W.G.

Place a lighter 2" away from the face of the filter.  It should bend over about 45 to 60 degrees, but not flicker or go out. It should also blow over the same amount no matter where around the face the filter you place it.  If there is too much flow, simply stack a couple of prefilters together to throttle it down or otherwise block off part of the intake.
RR


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: RogerRabbit]
    #19441681 - 01/19/14 09:18 AM (10 years, 1 month ago)



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Edited by Yuri.Pono (01/19/14 09:30 AM)


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InvisibleDoc Seta
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19441691 - 01/19/14 09:21 AM (10 years, 1 month ago)

Quote:

Yuri.Pono said:
I DO!!!

so im kinda researching just wondering how many folks have ordered their HEPA Filter from HERE?

was thinking maybe a 30 x 24 x 5-7/8 (99.99% HEPA wood) or 24 x 24 x 5-7/8 (99.99% HEPA wood)

reasoning is i want to g2g bags easily.

who is with me on this? just need help with the math on this. not the brightest bulb in the room when it comes to math.

so i suppose my 1st step is to order my filter and get the info off that to figure this out. just want to know if there is disadvantages of bigger hood other then weight. say expensive ass blower. which im good with.



I have a spot with thermal drapes, just reverse my ion hepa filter and flip a box on its side and shazzam 0 contams, screw paying $500.


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19446309 - 01/20/14 07:02 AM (10 years, 1 month ago)

Quote:

Yuri.Pono said:
zoro tools 1TDT8

http://www.grainger.com/product/DAYTON-PSC-Blower-1TDT8

think this is the correct one




BUMP

would this be the correct blower


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OfflineRogerRabbitM
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19446428 - 01/20/14 07:45 AM (10 years, 1 month ago)

Yes.  It will probably be sufficient wired on low speed.
RR


--------------------
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semper in excretia sumus solim profundum variat

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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: RogerRabbit]
    #19446477 - 01/20/14 07:57 AM (10 years, 1 month ago)

thanks RR :thumbup:


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19446919 - 01/20/14 10:13 AM (10 years, 1 month ago)

thank god for 30 returns. able to return it and just ordered correct blower:grin:

looks like this project will be finished as planned by the end of the week.


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19467894 - 01/24/14 02:11 PM (10 years, 1 month ago)

FINALLY!!!!!! my damn blower made it after getting the wrong one then they shipped the new one to the other side of town wrong address, and final i got this BITCH  :sunny:


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19467903 - 01/24/14 02:12 PM (10 years, 1 month ago)

now time for wood, electrical supply, and my wifes mouth to take care of this boner.


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InvisibleFungal growth
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19468094 - 01/24/14 03:00 PM (10 years, 1 month ago)

:murray:


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: Fungal growth]
    #19509985 - 02/02/14 08:29 AM (10 years, 22 days ago)

getting close



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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19520575 - 02/04/14 02:04 PM (10 years, 20 days ago)

so flowhood is finished but now i have to dial in my blow as stated here
http://www.shroomery.org/forums/showflat.php/Number/13851289


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19524321 - 02/05/14 09:14 AM (10 years, 19 days ago)



working on dialing it in


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OfflineMaJiK_420
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19525310 - 02/05/14 12:51 PM (10 years, 19 days ago)

:like:


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: MaJiK_420]
    #19532093 - 02/06/14 06:22 PM (10 years, 18 days ago)



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Edited by Yuri.Pono (02/06/14 06:23 PM)


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Offlineinvitro


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Re: who wants a flowhood? [Re: Doc Seta]
    #19729753 - 03/21/14 07:47 PM (9 years, 10 months ago)

Quote:

Doc Seta said:
Quote:

Yuri.Pono said:
I DO!!!

so im kinda researching just wondering how many folks have ordered their HEPA Filter from HERE?

was thinking maybe a 30 x 24 x 5-7/8 (99.99% HEPA wood) or 24 x 24 x 5-7/8 (99.99% HEPA wood)

reasoning is i want to g2g bags easily.

who is with me on this? just need help with the math on this. not the brightest bulb in the room when it comes to math.

so i suppose my 1st step is to order my filter and get the info off that to figure this out. just want to know if there is disadvantages of bigger hood other then weight. say expensive ass blower. which im good with.



I have a spot with thermal drapes, just reverse my ion hepa filter and flip a box on its side and shazzam 0 contams, screw paying $500.




Could you elaborate?  Do you have a link for your ion hepa filter? Pics please.


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Offlinetombosley8
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Re: who wants a flowhood? [Re: Yuri.Pono]
    #19771523 - 03/31/14 01:09 AM (9 years, 10 months ago)

so did this work out for you ok. Do you recommend i get the 6 inch filter instead of 12 or did that blower and filter work?
will this work i can't find the micron efficiency on the one your referring to or this one but i like that this one is 30x30 and rated around the same cfm what do you think?
http://www.ebay.com/itm/Hepa-Corp-Hepa-SEP-HE30WPUB-960-CFM-Filter-30-x-30-x-6-Great-Shape-/281201764311?pt=LH_DefaultDomain_0&hash=item4178ee67d7
So i just called hepa co. and was told this is 99.97% down to .3 microns. So i guess i'll go with another because i think i need 99.99, right?
edit: well with more searching i think 99.97 is acceptable as long as it is to .3 microns. still not sure what the one you are using is except it says down to .23 microns which i think is at 99.97 (not sure).


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Edited by tombosley8 (04/01/14 06:13 PM)


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OfflineYuri.Pono
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Re: who wants a flowhood? [Re: tombosley8]
    #19825882 - 04/10/14 09:37 PM (9 years, 10 months ago)

mine works great for me in fact i dont use the speed control either nor do i slow it down in anyway, im for sure not the person to ask for specs. as i needed much help from here.


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Edited by Yuri.Pono (04/10/14 09:45 PM)


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