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OfflineGermanShaman
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Choice of fan for DIY Laminar Flow Hood -Check my Calcs please.
    #27257163 - 03/17/21 10:42 AM (3 years, 9 months ago)

Can  I get some advice on this please.

I am looking at ordering a H14 HEPA filter 610mm x 610mm x 150mm (ie 24"x24" x 6" for those over the pond).

It has a static pressure of 250Pa. I will add a couple of prefilters with lets say and additional 100Pa of Static Pressure.

I have found a fan supplier and need some help in making sure that my calculations are correct and I am reading the fan data correctly.

to calculate the volume of airflow required : 610mm * 610mm is 0.3721 m3
multiply this by 0.5m/s and then multiply by 3600 to get the cubic meters per hour hour air flow rate.

this is 669.78 m3/hr. So lets say 670m3/hr.

So I need a fan that can deliver 670 m3/hr at a static pressure of 350Pa.

Can someone take a look at this fan please confirm that I am reading the graph correctly please?  If I read 350Pa on the vertical axis and move across to the curve and read the corresponding figure off the horizontal axis, I get about 700 M3/hr (just over 400 cfm)

Would this fan be suitable for my LFH?

Many thanks for your help on this.



I assume that this fan can not supply enough air or pressure.

Edited by GermanShaman (03/17/21 01:24 PM)

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OfflineGermanShaman
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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: GermanShaman]
    #27258397 - 03/18/21 04:52 AM (3 years, 9 months ago)

Anyone? Did I post in the wrong place?

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OfflinemAver
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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: GermanShaman]
    #27259089 - 03/18/21 02:51 PM (3 years, 9 months ago)

I'm assuming you are in the EU zone.
Quote:

So I need a fan that can deliver 670 m3/hr at a static pressure of 350Pa.




Yeah more or less, check this, my incomplete FH tek.
You want an ideal air speed of 0.5m/s but 0.4 will work as well. Lower than that is not really gonna help much against contams.

Good luck on finding the right fan, I had to look for a few hours to find mine.
If you can't find a "close enough" one get a stronger one and use one of these to power it down.

Edited by mAver (03/18/21 02:55 PM)

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OfflineGermanShaman
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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: mAver]
    #27260013 - 03/19/21 07:34 AM (3 years, 9 months ago)

Thanks for this mate. Can  I ask how much you paid for that fan from Italy?

I have a german company wanting to charge me €570 for a fan. It is more powerful than the above. At a Static pressure of 350 Pa it can deliver close to 800 M3/Hr.  Of course I only need it to go to 700 m3/hr so I will need to get a controller to turn it down a bit.

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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: GermanShaman]
    #27262821 - 03/21/21 05:55 AM (3 years, 9 months ago)

I got it it off Amazon for like 100 euros shipping included, I'll get you the link if i find it.here it is

I have some spare time so if you can tell me what is your country I can try to give you a hand finding one, I'll assume Germany from the images in the post.
However remember that you can expect spending around 1000 euros total for a DIY Flow Hood, which is 1/3 of a professional one

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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: mAver]
    #27262836 - 03/21/21 06:31 AM (3 years, 9 months ago)

I just realized you are using a filter twice the area of mine. If you are sure about your choice and that is what you need then no problem but you might want to reconsider otherwise.
You are building a huge pain in the ass of a filter, larger in size is harder to move.
Remember we are building it to last for 5/10 years of operation, so they aren't easy to take apart and perform maintenance.
I can somehow hold mine well enough if I have to move it but is heavy as hek.
You might want to build yours as a cabinet on wheels.

Still if you want to proceed with that and we don't find a good fan then I suppose using 3 of the Trial fan I used should do the job.
Two of them because you have twice the area, and a third one for good measure.
I used only one but am considering buying another as I don't have the perfect 0.5m/s airflow but less while using a weak prefilter with holes to allow more airflow.
At full power there is enough airflow to prevent contaminants but still I find it weak.
If this is the way you chose I can help you figure the wiring.

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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: mAver]
    #27262880 - 03/21/21 07:23 AM (3 years, 9 months ago)

So I did a bit of research and here are my findings:
1. Go to ebay and search for "centrifugal fan" (should lead you to Business, Office & Industrial>HVAC & Refrigeration>HVAC & Refrigeration: Parts & Accessories>HVAC & Refrigeration: Fans & Blowers>HVAC & Refrigeration Centrifugal Blowers)
2. In search settigns set item location to "EU", price range set to "100 to 250" euros.(You can set your own country as the product origin but will probably lower the selection)
3. Look around and find some that look like they would work, plus point if they have the Pressure(Pa) to Airflow(m3/h) graph.
4. Contact the sellers and ask for the detailed graph to be sure.
5. Buy the fan.
6. ?
7. Profit!

Here are some shops I found that are dealing in such fans:
fansgrillesducts
bngsystems17
spareparts4computers

If you want you can tell them the requirements and they may suggest the right product for you.
Just tell them you are building a badass air filter to keep corona out and that is what you need. Or maybe you have pollen allergy...Dunnow...

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OfflineGermanShaman
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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: mAver]
    #27264323 - 03/22/21 10:20 AM (3 years, 9 months ago)

Thanks for that mate. that is REALLY helpful. I will take a look at those.

In terms of size, the cost of a HEPA filer that is 305x610 is not much different from one that is 610x610mm. And as you said, I only want to build this once so I want it to last me for several years.  (Good idea to put it onto some wheeled legs.)  If I build one that is 610x610 then I can use it to go Grain to bulk transfers. The one that is half the size may not be able to do that.

My thinking is to over engineer so that I have capacity to grow.

BTW, do you need any spores at all for your "research" I have several in stock that I can let you have as a gift to further your research efforts.

PM if you like.

Thanks again.

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OfflineGermanShaman
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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: mAver]
    #27264501 - 03/22/21 12:59 PM (3 years, 9 months ago)

Quote:

mAver said:

I have some spare time so if you can tell me what is your country I can try to give you a hand finding one, I'll assume Germany from the images in the post.
However remember that you can expect spending around 1000 euros total for a DIY Flow Hood, which is 1/3 of a professional one





Thanks for the info above and the links.
I would love your help on this to find a supplier in the EU. All the German suppliers that I have spoken to can supply fans that meet the requirements but at a cost of around €600.  The ones on ebay and Amazon seem to be coming in at around €100-€250.  I'd be happy to spend around the €250.

I will hunt around ebay and ask for the data sheets for the fans there.

In the meantime, do you know of any on Amazon that would meet my requirements.  Essentially, 700 m3/Hr at 350 Pa. So something that supplies at 1000 m3/Hr and can be throttled down would be fine. There is enough headroom capacity to be able to deal with any blockages in the HEPA.

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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: GermanShaman]
    #27268619 - 03/25/21 09:38 AM (3 years, 9 months ago)

Unfortunately most resellers on Amazon/Ebay are not dedicated fan enthusiasts, just repair shops that have a large inventory and trade on retail.
From what I have seen they usually sell the fans as spare parts for heating systems and assume you already know what you are looking for.
If they have a decent photo or description you may find the producer and model number, then you can look up the specific details of the fan on the producer's website (if they have one, that's what I did to decide on mine)
I can tell you that you are looking for a fan that consumes around ~250W(double plus some spare) as mine goes on 90W and it barely does the job.
I'll take a look but don't expect much.

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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: mAver]
    #27268684 - 03/25/21 10:08 AM (3 years, 9 months ago)

So after a bit of research I found some:
This refers to one of those listed on pages 35/36 in this catalog.
I might be wrong as the ebay page has not enough detailed description but I think its the DD10/10 M9A3 1F 6P 1V +SCT (1F= monophase, domestic use current/ 6P=six poles/ 1V= one voltage mode control speed 230V / +STC= with terminal box mounted).
Also found this 650 m3/h at 350 Pa might just do it.

Screw all that, the catalogue is our best shot.
Unfortunately I haven't found a "close enough" fan to use, only overpowered monsters. I found several fans in it that easily reach and surpass the 800m3/h at 350 Pa, the problem is that you'll have to severely under-power them and our ideal values are almost always in the "gray" zone of the graphs.
The "gray" zone is where the manufacturer cannot guarantee correct operation and warns of overheating.
The best I found is the DD 9/7 M922 1F 4P 1V (maybe wrong url but model is right) but you'll have to make an outlet to divert half of the airflow(at almost 400Pa it can push 1500m3/h!!!).
Here is where I found most of the fans in the catalogue on sale. To me it's 10 euros shipping but you may have to pay more.

PS: thanks for the joint research offer, hit my Private Messages with a list of the samples you have, any new addition is welcome to The Collection.

Edited by mAver (03/25/21 11:26 AM)

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OfflineGermanShaman
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Re: Choice of fan for DIY Laminar Flow Hood -Check my Calcs please. [Re: mAver]
    #27306950 - 05/13/21 11:00 AM (3 years, 8 months ago)

Hey Buddy,

I finally found a fan. It is a bit over powered but thats ok because I have a controller to throttle the thing down a bit.

I'll hit you up in the PMs to let you see the catalogue.

Thanks for all your help.

Now I have to buy the wood to build the thing.

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