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OfflineEdmunter
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Edmunters everything Flow Hood. How to plan and build a laminar flow hood. * 8
    #26187961 - 09/14/19 12:05 PM (4 years, 5 months ago)

Building a flow hood

Selecting the right size filter for your job


- When thinking about this you need to think bigger picture

                      o How far am I taking this
                              - If you are thinking commercial think wide and tall
                      o What work am I going to do in front of it
                              - If you are working bags think tall
                      o How many people will work in front
                              -         More than one think wide
                      o Work space
                              -         You cant fit an elephant into a mouse cage


-      For me my thought  process was :
                     
                      o I want to try commercial in the future but on a small scale and will upscale with the business
                      o I will be doing bag work which means tall
                      o I will be working alone so it doesnt need to be too wide
                      o In the 6 Meter x 3 Meter grow area I built the lab room in the corner of that is only 5ft by 4ft plus I wanted space for lab equipment so.

- In the end with all this in mind I decided on a 24’’ x 24 ‘’ filter and so to the task of sourcing the right filter.

The right filter for the job


-   Hepa filter 99.99% filtration  you want  H13-H14 - HEPA H14: pass up 0.005% of 0.1 micron particles per liter of air.
         
                      o It doesn’t matter where you get it from or cost but in the UK you are looking at £150- 300 for a decent filter


Matching your filter to your Fan


-   This is the most complicated part of the process and I will try to simplify it for you

                      o Each fan has a pressure drop-This means the resistance the filter gives you when you blow air through it to get a proper flow
                      o You need to match that with the speed of the fan so it gives you a speed of 100 feet per second or 400 m3/h
Lets be honest if you get sterile air blowing continuously at your work at any speed it will keep most mould spores and air bound bacteria at bay.  However what you really want is a laminar flow

*              Laminar airflow is defined as air moving at the same speed and in the same direction, with no or minimal cross-over of air streams (or “lamina”). By contrast, turbulent flow creates swirls and eddies that deposit particles on surfaces randomly and unpredictably.

-       My example will be the fan I bought for my hood


The filter I bought was this  MP78-2424 from Json filter https://www.jfilters.com/

and the pre filter Hi Cap Pleated Panel 12x12x1


It is a H14 meaning it filter 99.995% of all particles 0.1 microns.
You will notice that it is a new school thinner filter and there were some interesting debates on the threads at the end* on whether or not its right.  It Is!!!!!!
On this chart you will see the 2424 filter data and all you need to know is pressure drop verse the flow rate.

For the blind and lazy its here


As you can see the pressure drop on this is 100 PA and the flow rate is 603M3/hr.  In the US they measure differently. Being in the UK the go to Dayton blowers aren’t affordable or readily available and so what I did was go round all the uk mushroom growing sites and got a consensus.  Which lead me to the path of the RVK range.  You can find them on the internet and I suggest you buy local if you can.


Each blower comes with a chart that allows you to find its compatibility with any pressure drop you face in any job it needs to do.  In this case its this one
What this info is telling you is the Pressure drop verses the m3/h.  Keeping in mind im using a prefilter and a controller -looking on the chart I decided to get a RVK250E2-L1.  As you can see it comes in at just over 900 m3/h. Bearing in mind the prefilter has a pressure drop and using using the controller, 100% compatible with the fan unit(you need to find this out, important!)I can get the desired airflow by dialing it down.  Again the reasoning behind this was that in the future as the filter gunks up I can up the flow rate accordingly giving me extra life out of it. https://www.ebay.com/itm/Fan-Speed-Controller-3-amp-Triac-High-Quality-ME1-3/292264269477?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
CALCULATIONS AND DEBATE ARE ALSO IN THE LINKS PROVIDED.*

and

Well there is all the boring shit out of the way.  It’s a bit like making a spliff when you are tripping so hard you cant see or remember what you are doing.  Its fucking hard but as long as you stick the rizzla's the right way round, totally worth it.  All you need now it the material you choose to build it out of.  I chose some nice looking ply.

The build



First off you need to build a box for the flow hood and can if you want build a box for the fan, I did.


For sizes you want to work out a length where the fan sits on top but doesn’t overhang  as it would be a pain trying to slide it up against a wall and deep enough so it misses the filter casing and wooden flange.  This is 2 lengths in my case at 18’’ x 24’’ (457mm x 610mm) and 2 length at 18’’ plus 24 (457mm x [610mm + 18mm x 2] = 646mm) plus the thickness of the wood x 2.  The back panel is 24'' x 24'' 610mm x 610mm



I have a merchants who will cut your wood for if you buy it there so get your measurements right and save time.  My guy fucked it up, I was too lazy to go back………and I had to work round it.

For every screw drill a small pilot hole and you wont get splitting wood.
Attach the bottom, sides and back together with 4-5 screws on each join




Add the top but don’t screw in

Place the filter in the build and mark how far it goes in by pencilling in a line round the filter.

Remove the filter and make a seat for the filter to buffer up too. This is done by cutting a 45% angle on the 4 -2 inch by 1/2inch pieces and fitting them to the inside of the box.



Add the top but don’t screw in.



Check to make sure the filter fits, we are looking for as snug as fuk



Place the fan/blower on top of the hood making sure the back doesn’t overhang and the sides are centred by measuring the distance.



Pencil round the fan to mark the area you need to cut to sit the fan/blower in.



Drill some holes in that area to allow the jig to do its work



Important info


Set the fan/blower in the hole and wire the controller up.  Its usually plug to Fan/blower live neutral Earth  to live neutral Earth lug on the controller, then  Earth lug to earth, UZ to live and U to neutral on the fan.



measure round it to work out the size of the top box



Build the box separately and add a hole for the top filter dont worry about glue here suction will keep it in place


Cut a small hole for the lead to go through



Cut 4 lengths of wood with a 45% angle to hold the filter in place.  I took the bottom one out in the end as I like some work up as close to the filter as possible for some work.



Take everything apart glue all the joins, screw together again and silicon all the edges.  Place the filter in the hood and screw in place using the batons without gluing



Its then ready to test with and anemometer. 



This one is shit and not sensitive enough but to be honest the lighter test is sufficient.  As long as you have a 90-ish degree angle when you hold a lighter near to the filter and it doesn’t go out that is sufficient.

Your hood is now ready to use.

Find yourself or build yourself somewhere to work



And get on with it.



One small piece of advice.  Treat your wood with some anti mould substance.  I didn’t and grew a little black mould……genius, so I painted it



And built some shelves for luck



and I bought a 2nd hand fridge for cultures



I love working with mushroom in any shape or form and having a hood allows you to concentrate on all the good stuff confidently.  Be good to each other and don’t ever forget



*Here are my research thread with some interesting debates especially from Alien and Jbg.  Thanks for everyone who helped me get my head round what at the time seemed super complicated.  I loved the journey and hope this helps others. What a banging cool community this place has.

https://www.shroomery.org/forums/showflat.php/Number/26168622/fpart/4/vc/1#26168622
https://www.shroomery.org/forums/showflat.php/Number/26092698

   
        ***********************************UPDATE*************************

It is very important to seal up the casing around the edges with something like wood filler or silicon..  You need to check on the monthly too






Edited by Edmunter (02/12/21 02:05 AM)


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OfflineEdmunter
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Re: Edmunters everything Flow Hood. How to plan and build a flow hood. [Re: Edmunter]
    #26458771 - 01/29/20 04:25 PM (4 years, 18 days ago)

For procedures work


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OfflineEdmunter
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Re: Edmunters everything Flow Hood. How to plan and build a flow hood. [Re: Edmunter]
    #26458773 - 01/29/20 04:26 PM (4 years, 18 days ago)

For advice and good practice


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OfflineeLeSDenes
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Re: Edmunters everything Flow Hood. How to plan and build a flow hood. [Re: Edmunter]
    #26458934 - 01/29/20 06:45 PM (4 years, 18 days ago)

Quality work! I am sure you gonna enjoy the extra height of the filter when using big bags :laugh:


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Invisiblestaytrippy420
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Re: Edmunters everything Flow Hood. How to plan and build a flow hood. [Re: eLeSDenes]
    #26458965 - 01/29/20 07:00 PM (4 years, 18 days ago)

Thanks for the write up Ed! :rockon:
This will come in handy if I ever decide to build one.


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OfflinecronicrFacebook
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Edmunter]
    #26458990 - 01/29/20 07:17 PM (4 years, 18 days ago)

This thread was moved from the user's journal.

Reason:
:super:


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OfflineSockadin
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: cronicr]
    #26459210 - 01/29/20 09:25 PM (4 years, 18 days ago)

This is pretty awesome, nice job Ed!


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OfflineTonyMushrana
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Sockadin]
    #26459410 - 01/30/20 12:29 AM (4 years, 18 days ago)

Follow


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OfflineSmoothcat
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: TonyMushrana] * 1
    #26459503 - 01/30/20 03:32 AM (4 years, 18 days ago)

Khob khun Krab Ed mate!!!

I’ve got the same filter and purchasing the same fan today so I’m basically gonna copy your build, hope you don’t mind man lol

Credit where credits due and I’ll be posting my updates when I get it all sorted, hopefully by the end of next week.

Cheers dude, you’ve been a great help :thumbup:

:sagetrip:


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Offlinejbgtaa
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Smoothcat]
    #26459914 - 01/30/20 09:40 AM (4 years, 18 days ago)

Are those types of blowers specific to the UK? It seems smaller yet just as powerful as the Dayton’s we get here acros the pond, would love to source one in the future if possible. What was the price like?


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OfflineEdmunter
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: jbgtaa]
    #26460512 - 01/30/20 03:51 PM (4 years, 17 days ago)

£100 and under


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OfflineUnknown error
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Edmunter]
    #26462334 - 01/31/20 03:31 PM (4 years, 16 days ago)

Awesome work, nice one


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OfflineFeedYourMind
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Unknown error]
    #26462478 - 01/31/20 04:57 PM (4 years, 16 days ago)

Sweet write up. Very clean, looking. I built my first 48x48 FH about 4 months ago or so and haven't looked back. This would have been another great tek for guidance. I didn't use a fan speed controller, however, and just wired it all to a switch that I installed on the side of the box. I've read on here that the fan speed controllers can put a lot of work into the blower and cause problems. To combat this, all I did is add a pre-filter to the intake portion of the blower fan and voila - .4-.5m/s consistently on the face of the filter. Works perfect! :super:


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OfflineSmoothcat
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: FeedYourMind] * 1
    #26467979 - 02/04/20 06:56 AM (4 years, 13 days ago)

Yo Ed! :hi:

So my fan arrived today and I have a question about your top box. Did you screw that to the build of the main box at all or glue it or is just basically sitting on top of the main box and around the fan?

Basically as I’ve spent a fair bit on all this already and the cardboard box the fan was delivered in is obviously a perfect fit for the fan and reasonably sturdy. Do you reckon I could use that as a temporary measure to hold the pre filter until a later stage when I get round to building a proper top box for it? Does this fan generate a lot of heat do you know as I wouldn’t want it being a fire risk lol

All I’ve got to do now is order my wood and I’m good to go!

Cheers for the help man!!

(Here’s a picture of the fan box with pre filter on it to try and illustrate my point)



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OfflineSockadin
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Smoothcat]
    #26467990 - 02/04/20 07:05 AM (4 years, 13 days ago)

They can generate heat. I would opt to install it sanss fan box and prefilter. That's just me and my build it not as nice as some others. I literally just have a blower screwed to the outside of my Hepa Box.


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OfflineEdmunter
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Smoothcat]
    #26468023 - 02/04/20 07:33 AM (4 years, 13 days ago)

Quote:

Smoothcat said:
Yo Ed! :hi:

So my fan arrived today and I have a question about your top box. Did you screw that to the build of the main box at all or glue it or is just basically sitting on top of the main box and around the fan?

Basically as I’ve spent a fair bit on all this already and the cardboard box the fan was delivered in is obviously a perfect fit for the fan and reasonably sturdy. Do you reckon I could use that as a temporary measure to hold the pre filter until a later stage when I get round to building a proper top box for it? Does this fan generate a lot of heat do you know as I wouldn’t want it being a fire risk lol

All I’ve got to do now is order my wood and I’m good to go!

Cheers for the help man!!

(Here’s a picture of the fan box with pre filter on it to try and illustrate my point)






Yeah that will work.  I just left my box loose on top till I was happy and then just siiconned it in place for easy removal if there is a problem


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OfflineMLPismyOPSEC
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Edmunter]
    #26469977 - 02/05/20 09:54 AM (4 years, 12 days ago)

Nice thread! Looking forward to the procedures/good practice sections. I haven't looked through the linked debate threads just yet so it may be answered in there, but what made you decide on 24"x24"? I haven't used bags or a FH yet but i feel that 24"x24" might feel just a hair cramped when working with bags.


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OfflineEdmunter
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: MLPismyOPSEC]
    #26470156 - 02/05/20 11:48 AM (4 years, 12 days ago)

Quote:

MLPismyOPSEC said:
Nice thread! Looking forward to the procedures/good practice sections. I haven't looked through the linked debate threads just yet so it may be answered in there, but what made you decide on 24"x24"? I haven't used bags or a FH yet but i feel that 24"x24" might feel just a hair cramped when working with bags.




It just about works but if i did anymore id defo go 24 x 36


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Invisibletramalot
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: Edmunter]
    #26470430 - 02/05/20 02:41 PM (4 years, 12 days ago)

What's the difference between the MERV and HEPA ratings, just UK USA nomenclature?


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OfflineEdmunter
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Re: Edmunters everything Flow Hood. How to plan and build a laminar flow hood. (moved) [Re: tramalot]
    #26470942 - 02/05/20 07:09 PM (4 years, 11 days ago)

Quote:

tramalot said:
What's the difference between the MERV and HEPA ratings, just UK USA nomenclature?




No you use MERV you need it to be the same as HEPA that filters 99.99 % 0.3 microns at least.  Merv 17-20 is close to that but id go for a hepa filter, USA have them.


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