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Offlineindahighcountry
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Registered: 08/03/12
Posts: 49
Last seen: 10 years, 9 months
Re: About to build a flow hood [Re: Dmix005]
    #18163563 - 04/24/13 08:56 PM (11 years, 27 days ago)

Dmix

1) start your own thread

2) an extra 7/8 is going to make a difference but not truly significant, buy a "slightly" overpowered fan and use pre-filters as needed to reduce flow to steady laminar

if you're not working in a clean room then build a small enclosure for your work area to prevent air from the sides getting in - the top piece is worth using glass vs lexan or other plastic since it doesn't get cloudy over time from wiping with alcohol

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OfflineDmix005
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Registered: 05/31/09
Posts: 9
Last seen: 10 years, 9 months
Re: About to build a flow hood [Re: indahighcountry]
    #18163898 - 04/24/13 10:03 PM (11 years, 27 days ago)

thanks for the response :smile:

I would start my own thread but I don't have that priveledge :S

While this has been helpful...I'm still not ready to make a purchase.  There are still unanswered questions in my previous posts and I think they're important.  following is a summary:

1) have I done the math right?
2) have I correctly identified the filter's Static Pressure?
3) have I selected the right blower?
4) Am I overpaying for the blower at $185?
5) Is the spec (344 CFM @ .29 W.G.) enough information to select a  blower?

As somebody trying to figure all this out, I think its important to get as many specific details into a single thread as possible.  Even the thread "I want to construct a HEPA hood. How do I match a blower to a HEPA filter?" does not provide all the information.  It assumes the SP of the filter is 1 inch...which isn't helpful for someone who doesn't understand how to interpret the information given in the hepa filter spec sheets. 

Perhaps you or anyone else could clear this up for us?  I think I've got all the info I should require..so how do I put it all together?

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OfflineAmanita virosa
botanist by day
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Registered: 12/04/11
Posts: 2,458
Loc: north kakalacky
Last seen: 10 months, 4 days
Trusted Cultivator
Re: About to build a flow hood [Re: Dmix005]
    #18164860 - 04/25/13 05:13 AM (11 years, 26 days ago)

If you live in the states zoro tools is the best deal on the blower. That blowet was $160 with free shipping last i checked  Stop obsessing on the perfectly sized blower. The 1tdt2 is mor than enuf blower for any 24x24x6 inch hepa you will  find. You want it oversized. You can easily decrease the flow.....but if your  blower is sized perfectly to a new hepa, you will have no way of increasing  it as the filter clogs and creates more resistance. This is why we oversize the blowers. I am running a 1tdt2 right now thru a 36x36x12 and it's plenty of blower. That is an excellent choice. Just be sure to buy a quality hepa and ur golden.

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Offlineforrest
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Registered: 11/16/12
Posts: 1,011
Loc: The Netherlands
Last seen: 4 years, 10 months
Re: About to build a flow hood [Re: Amanita virosa]
    #18164886 - 04/25/13 05:37 AM (11 years, 26 days ago)

i agree on the need for a really all-covering flowhood construction-file. with all the theorie behind it and presented in both american and european metric system with conversions.
with an organised overvieuw of calulations and construction options.

i'm trying to get my head around it atm, wanting to build my own, but having a really hard time comprehensing it. if it does succeed i will help make such a file, so that there will be an end to all the new flowhood-threads.


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OfflineDmix005
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Registered: 05/31/09
Posts: 9
Last seen: 10 years, 9 months
Re: About to build a flow hood [Re: Amanita virosa]
    #18165939 - 04/25/13 11:45 AM (11 years, 26 days ago)

thank you!!!! :laugh:

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Offlinethenilsmeister
Shroomery addict
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Registered: 04/23/12
Posts: 262
Last seen: 3 years, 1 month
Re: About to build a flow hood [Re: Dmix005]
    #18220094 - 05/05/13 10:17 PM (11 years, 15 days ago)

I think I have some cycloning going on, I cant seem to get rid of it no matter how much I dial up or dial down with pre filter material. Hoping I dont have to take it apart and remake it.



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Invisiblefastfred
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Folding@home Statistics
Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
Re: About to build a flow hood [Re: thenilsmeister]
    #18220181 - 05/05/13 10:36 PM (11 years, 15 days ago)

That's the problem with trying to rely on laminar flow.  The right and even static pressure depends on the right plenum design and varies over the life of the filter.

Also, without sides on the hood any draft or air movement will destroy your laminar flow anyways.  Your filtered air blowing past the still air of the room will generate vortexes and suck contams in from all sides.

I've always told people that trying for laminar flow is a rather poor way to design a flow hood.  Best case it's ridiculously expensive, worst case and you get problems like this.


-FF

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Offlinethenilsmeister
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Registered: 04/23/12
Posts: 262
Last seen: 3 years, 1 month
Re: About to build a flow hood [Re: fastfred]
    #18221639 - 05/06/13 09:59 AM (11 years, 15 days ago)

I have sides on it, debating wether to put on a top shield.


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Offlinesvenoldb
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Registered: 06/07/13
Posts: 10
Last seen: 10 years, 10 months
Re: About to build a flow hood [Re: thenilsmeister]
    #18465518 - 06/24/13 02:07 PM (10 years, 10 months ago)

Good luck

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