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InvisiblePirateSwazey
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How to Build a Basic Flowhood * 15
    #19798444 - 04/05/14 08:31 AM (10 years, 1 month ago)

                                 

To start this project you will first need to buy a 99.99% pleated HEPA filter, preferably designed
for a laminar flow hood. Decide what size filter you would like to work in front of, then source it
from an online vendor, eBay, or fungi.com.

After you have chosen a specific filter, you will want to find a blower that will match it.

Here is the basic formula to do so:

For laminar flow we want 100ft3/min coming out of the filter. To find this:

1) Multiply the length and height of your filter to find the area (in feet) of your HEPA.

      Ex: 2' x 2' HEPA Filter = 4ft2

2) Multiply that number by 100ft3/min

      Ex: 4ft2 x 100ft3/min = 400ft3/min

3) Add the static pressure (SP) your HEPA + .2" of SP for the pre-filter . The static pressure
of your filter will be listed on the filter itself or a spec sheet that comes with it,
and will read in inches of W.G. If you custom order a filter or order one from Stamets you can find
out the filter's static pressure from them. Add .2" for the pre-filter.

      Ex: HEPA SP = 1" ; Pre-Filter SP = .2" ---> 1"+.2" = 1.2" SP

4) Find a blower that meets the required airflow @ X" of SP (where X = total from #3 above).
A great  place to start looking is Grainger because most of their products have spec sheets
online that will tell you what each fan's output is at many different levels of static pressure.
I always recommend overshooting the size of the blower a bit because it can always be toned
down by choking the intake with extra pre-filters, or you can regulate the motor
with a speed controller.

          Example:
      For my filter, 2ft x 2ft = 4ft2, then multiplied by 100ft3/min, equals 400ft3/min.
      Then by adding the static pressures of the filters (found on the filters themselves),
      1" (for the HEPA) and .2" (for the pre-filter), the total static pressure comes to 1.2".

So in this case a blower that moves 400CFM @ a static pressure of 1.2" is what is required
to make laminar flow with my filter.


It is important to note that blowers are rated for different outputs at different levels of resistance,
or static pressure. As SP increases, the amount of air the blower can move will decrease. This is
why you find the sum of the static pressure of your filter & pre filter, so you can compensate for
the resistance of airflow created by the filters.

For this particular flowhood build, I did not get an exact blower to match my filter. I got a
free blower from a friend who works in HVAC and was able to make laminar flow by adding a
speed controller to regulate the amount of airflow coming from the blower.



         


              BUILDING MATERIALS:                                                    TOOLS:                                                     

    2 Sheets of 3/4" sanded ply wood - ($70)                                Drill(s)
    2 Pieces of 2"x1" furring strip - ($2)                                          Caulk gun
    Box of star drive wood screws - ($7)                                        Straight edge
    Tube of silicone all purpose sealant  - ($6)                                Drill bits
    Variable speed controller - ($20)                                            Measuring tape
    Small spool of 12-18ga wire - ($5)                                            Jig saw
    Roll of duct tape - ($3)                                                              Skil saw 
    Few wire nuts - ($3)                                                                  Pencil
    3 Prong plug - ($3)
    14"x14" Ultra Allergen Pre filter - ($14)
    99.99% 24"x24"x6" HEPA filter - ($160 shipped)
    Squirrel Cage Blower - (FREE - $400)


                                TOTAL FOR THIS BUILD      $300 - $330


               

Get a friend to help out. Having an extra pair of hands throughout the whole process makes it easier.



Unless you consider yourself a craftsman, have your wood pre-cut at Home Depot or Lowe's
when you go to get it. They will be able to cut it for you in just a few minutes for free. Be sure
to account for the width of the 3/4" plywood in your measurements. The 5 sides of your box
will not have the same measurement!



Pre-drill all of the holes for your box.This will keep the plywood from splitting when you
run the screws into it. Use 2 drills to keep from having to change bits every few seconds.
Also use star drive screws (most of the screwboxes will come with the bit); they grab much better
and won't strip out on you while trying to put them in.


                   


The biggest thing that will make this project easier is  using a speed controller.



         

The filter I ordered was a 24"x24"x6" wood framed 99.99% HEPA from filtera-b2b.com.
I had to call the company to place the order, which took about 25 days to reach my
doorstep, including the time it took to manufacture (they are made to order). The main
reason I picked the 24"x24" filter is because I wanted to be able to G2G into spawn bags.


                                   


I learned from reading EvilMushroom666's build that he and Total were able to wing it on
their blowers by calling and asking local HVAC companies if they had any old squirrel cage
furnace blowers sitting around that they might be willing to part with. As it turns out,
most of the time they will have a few, and be willing to let you have one for relatively next
to nothing. I ended up knowing somebody who knew somebody who worked in HVAC, and
all I had to say was that I wanted a blower to move air out of my screened in porch
during the summer.

I chose to shoot for a bigger blower than a smaller one because it is always possible to choke
a bigger blower down, whereas a smaller one would need to have a bigger motor
installed, defeating the purpose of getting it for free.  In the end, the blower I got
moved so much air that I wasn't able to choke it down enough by blocking the intake, so I
went to Harbor Freight & bought a speed controller that the motor plugs into.

If you also choose to use a used blower for this project it will be a good idea to take it apart and
clean it before installing it to keep a bunch of nasty shit from immediately getting stuck to
the back of your new HEPA filter. Take the motor off & remove the wheel, then clean the parts
(minus the motor) with brake cleaner.

                   




       

I decided to go with a 2 foot cube for my box. I'm sure you could go with a smaller plenum if
your blower is smaller. My advice is to build the box around the filter, that way you can be
sure that it fits properly. Doing it this way will also help you to put the 4 sides together,
(the top goes on last after the blower is mounted) and helps keep all of the angles right.


                                   


After the 4 sides are together, measure the depth of the filter and mark it inside the box. This is
for the furring strip, which is used to butt the filter up against & hold it into place. Cut your furring
strips at the length of the box's panels (2 of the strips will need to be 1" shorter as they will run
into the adjacent strips).


                                   


For the top part of the box trace the shape of the outlet on your blower & cut it out with a
jig saw. I used some small nuts & bolts to attach it to the box but screws will work too.
Make sure to silicone around the edges where the fan's outlet meets the wood.


                             


Next use the caulk gun & run a bead of silicone around every joint inside the box, including
around the furring strip on the inside. After that put on a glove and smooth it all out with your
finger. This will ensure that the silicone gets pushed up into the cracks & makes a proper seal.


                   


Now the box should fit around the filter like a glove. You may have to use a rubber mallet and a bit
of strip to convince it to slide back into place. After, attach furring strips around the outside face to
make a trim that will sandwich the filter in place.


                   


I also chose to build a top box on my flowhood. Doing this makes it quieter and also provides the
best way to mount a pre filter. Make sure to drill a small hole on one side of the top box for your
wires to come out of. If you build a top box, be sure to put silicone all around where the two boxes
come together, as well as around the hole where the wires come out.


                   

*** Do not mount the pre-filter inside the top box as I did in the pictures above! It made it difficult to
change & couldn't put a new one back in that way anyways. Mount the pre-filter outside of the top box! ***




Most of the time blowers have a few different speed settings you can try by changing
which color wire you give power to. This one had 4 different speeds on it, each corresponding
to a different colored wire going to the motor. The white wire coming off of the motor will be
the constant. Connect that to the silver screw in the 3 prong plug. Test out each of the colored
wires and figure out which one you think is going to work best for you. Whichever colored wire
you use, (I used yellow) connect to the gold screw. It took about 30 minutes of messing with
the wiring on this thing to get it right.  It is simple enough & there are plenty of videos on
youtube explaining how to wire a blower if you can't to figure it out.


                   



Once the plug is all wired up, plug it into the bottom of the speed controller & play around
with it. You want the flow coming out of the filter to be just strong enough to bend a bic lighter 60-90°
without blowing it out.


                   


--------------------
 

BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


Edited by PirateSwazey (12/22/17 06:00 PM)

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InvisiblebodhisattaMDiscordReddit
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Re: How I Built My Flowhood [Re: PirateSwazey]
    #19798469 - 04/05/14 08:40 AM (10 years, 1 month ago)

:thumbup::cool:

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Offlineshocker
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Re: How I Built My Flowhood [Re: bodhisatta]
    #19798528 - 04/05/14 09:07 AM (10 years, 1 month ago)

Thanks for the great post/tutorial. I love the ingenuity on these forums!

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OfflineGiggle_Grower
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Re: How I Built My Flowhood [Re: bodhisatta]
    #19798540 - 04/05/14 09:11 AM (10 years, 1 month ago)

Excellent write up. Seriously, well done. Its very easy for a noob to follow.. +5:mushroom2: for you.


--------------------
I'm  always interested in trades.
The Awesome Purple Mystics
Noobs! The best tool here is up top to the right. Don't  forget about it. Just type your question in!:cool:
RR is my favorite source of knowledge. Check out his videos!

If I forgot to leave you a rating, please remind me.

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OfflineRogerRabbitM
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Re: How I Built My Flowhood [Re: PirateSwazey]
    #19798664 - 04/05/14 10:05 AM (10 years, 1 month ago)

Quote:

PirateSwazey said:

                   
Well there you have it. That is how I built my flowhood. Feel free to ask any questions or
make any suggestions... Any feedback is always appreciated... stay Shroomy out there!




Nice write up.  :thumbup:

Two things.  First, since that motor has a capacitor, be sure to always start it at full speed, and then reduce it later.  Trying to start at reduced speed 'can' melt things down.  Second, slow it down a bit more or stack a second prefilter.  Bending the flame 90 degrees is great for cleaning the room before getting started, but once you're actually doing sterile work, back it off to 45 to 60 degrees and work right up close to the face of the filter.
RR


--------------------
Download Let's Grow Mushrooms



semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
Thomas Edison

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Invisible36fuckin5
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Re: How I Built My Flowhood [Re: RogerRabbit]
    #19798976 - 04/05/14 11:59 AM (10 years, 1 month ago)

Another thing - using weatherstripping or something similar instead of silicone to seal the box for your blower will allow you to remove it if necessary, making it lighter and easier to move if you ever need to.


--------------------
Pat The Bunny said:
A punk rock song won't ever change the world, but I can tell you about a couple that changed me.

bodhisatta said:
i recommend common sense and figuring it out.

These are the TEKs I use. They're all as cheap and easy as possible, just like your mom.

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InvisiblePirateSwazey
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Re: How I Built My Flowhood [Re: 36fuckin5]
    #19799087 - 04/05/14 12:28 PM (10 years, 1 month ago)

Thanks for the kudos boys. Its always nice to know your work is worth the effort. Another thing about the capacitor that I should mention is to not touch both terminals on it at the same time.. should be kind of a no brainer but maybe not :shrug:

Quote:

RogerRabbit said:
Bending the flame 90 degrees is great for cleaning the room before getting started, but once you're actually doing sterile work, back it off to 45 to 60 degrees and work right up close to the face of the filter.
RR



Thanks RR, that is good to know. All of the posts you've made on other people's builds over the years helped me a lot, so thanks again for doin what you do :thumbup:

Quote:

36fuckin5 said:
Another thing - using weatherstripping or something similar instead of silicone to seal the box for your blower will allow you to remove it if necessary, making it lighter and easier to move if you ever need to.



I actually caulked the top box for that reason since I had some around... maybe I should put that in the OP. Good lookin out 36.


--------------------
 

BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


Edited by PirateSwazey (04/05/14 02:03 PM)

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Invisible36fuckin5
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Re: How I Built My Flowhood [Re: PirateSwazey]
    #19799110 - 04/05/14 12:35 PM (10 years, 1 month ago)

Well, you'd still silicone the inside of that top box, but I'm saying just at the bottom, you can put flanges on your box and attach it down that way, through the weatherstripping. Some handles on each box makes it much easier, too. These bitches get heavy when they're assembled. After you move a 4' x 2' hood that's permanantly attached together, you tend not to forget how heavy they get, lol.


--------------------
Pat The Bunny said:
A punk rock song won't ever change the world, but I can tell you about a couple that changed me.

bodhisatta said:
i recommend common sense and figuring it out.

These are the TEKs I use. They're all as cheap and easy as possible, just like your mom.

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Invisiblevirus1824
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Re: How I Built My Flowhood [Re: 36fuckin5]
    #19802675 - 04/06/14 08:41 AM (10 years, 1 month ago)

Was looking for a nice flowhood writeup. Was not disappointed.

Question though. Why didn't you include a glass window in front against contaminations from breath, like the pic i included below. Or is this a non issue?



--------------------
A weekend wasted is never a wasted weekend

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InvisiblebodhisattaMDiscordReddit
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Re: How I Built My Flowhood [Re: virus1824]
    #19802678 - 04/06/14 08:42 AM (10 years, 1 month ago)

I would just think that glass shield would cause added turbulence and make things less sterile if anything. You should be wearing lab gear anyway. Face mask etc...

Those also look like two furnace filters side by side... :suicide:

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Invisiblevirus1824
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Re: How I Built My Flowhood [Re: bodhisatta]
    #19802698 - 04/06/14 08:49 AM (10 years, 1 month ago)

Quote:

bodhisatta said:
I would just think that glass shield would cause added turbulence and make things less sterile if anything. You should be wearing lab gear anyway. Face mask etc...

Those also look like two furnace filters side by side... :suicide:




I very much doubt the first, but certainly agree with the second. Also I didn't include the picture to discuss which filters they used, but the model.


--------------------
A weekend wasted is never a wasted weekend

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OfflineStromriderM
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Re: How I Built My Flowhood [Re: virus1824]
    #19802720 - 04/06/14 08:59 AM (10 years, 1 month ago)

Nice work my good friend :thumbup:

I'm jelly :ooo:

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InvisibleJ. Jack Flash
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Re: How I Built My Flowhood [Re: Stromrider]
    #19802780 - 04/06/14 09:20 AM (10 years, 1 month ago)

excellent, just excellent.  resourceful and crafty.  fuck me, now i want one.  :header:

but never with star drive, capt kirk.  :justno:  it's just irresponsible suggesting that.

:classictroll:


--------------------
 
the j stands for jesus.
2020 new years grow along

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InvisiblePirateSwazey
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Re: How I Built My Flowhood [Re: J. Jack Flash]
    #19805999 - 04/06/14 10:44 PM (10 years, 1 month ago)

Quote:

virus1824 said: didn't you include a glass window in front against contaminations from breath, like the pic i included below. Or is this a non issue?



Nope not really an issue :shrug:


Quote:

Stromrider said:
Nice work my good friend :thumbup:

I'm jelly :ooo:



Thanks buddy!! Let me know when you want to build yours & I'll come be your extra pair of hands!!
...or u can just come visit every time u need to G2G :rofl:

Quote:

J. Jack Flash said:
but never with star drive, capt kirk... it's just irresponsible suggesting that.




:nodofunderstanding:


--------------------
 

BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


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Offlineb4n4n4r4m4
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Re: How I Built My Flowhood [Re: PirateSwazey]
    #19806406 - 04/07/14 12:36 AM (10 years, 1 month ago)

Hey man this is really cool. I might be being an idiot or something, but for the life of me I cannot find a link to the HEPA filters on that website. Would you possibly be able to provide a direct link to the filter you purchased? Thanks!

Edit://
Also This looks like a pretty great setup, I am just wondering if it would be possible/feasible to make a box that could be collapsable? This thing is pretty large and I could store it if I needed to, but I would love to be able to "hide" it away when I wasnt using it, maybe in a closet or under my bed or something. Obviously youd need the box to be sealed but if you used something like duct tape or some sort of removable adhesive to seal it do you think that would be enough? Thank you!


--------------------
Everybody's working for the weekend!
============================
My Trade List

Edited by b4n4n4r4m4 (04/07/14 01:01 AM)

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InvisibleDelection
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Re: How I Built My Flowhood [Re: b4n4n4r4m4]
    #19806431 - 04/07/14 12:44 AM (10 years, 1 month ago)

Source your HEPA filter from this site.

http://www.fungifun.org/English/Flowhood


--------------------
Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!”

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InvisibleDelection
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Re: How I Built My Flowhood [Re: Delection]
    #19806449 - 04/07/14 12:48 AM (10 years, 1 month ago)

I just looked at what is listed on that link I sent you, you can pickup a nice 24x24 Astrocel for $75 - Thats a steal for that filter.

http://www.ebay.com/itm/271175231161?item=271175231161


--------------------
Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!”

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InvisiblePirateSwazey
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Re: How I Built My Flowhood [Re: b4n4n4r4m4]
    #19806454 - 04/07/14 12:49 AM (10 years, 1 month ago)

Quote:

b4n4n4r4m4 said:
Hey man this is really cool. I might be being an idiot or something, but for the life of me I cannot find a link to the HEPA filters on that website. Would you possibly be able to provide a direct link to the filter you purchased? Thanks!



It looks like their website is broken & is sending you to the company's main page right now.

All that they offer online is a spreadsheet with different sizes & trims, you have to call & place the order by telling them exactly what you want.

Mine specifically was 24"x24"x5.7/8" 99.99% efficiency wood framed HEPA.

If you wanted a 24"x48"x5.7/8 you would just tell them that is what you want & they will make it.


--------------------
 

BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


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Offlinewalfredo
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Re: How I Built My Flowhood [Re: PirateSwazey]
    #19809636 - 04/07/14 07:06 PM (10 years, 1 month ago)

Wow, that is pretty sweet man.  I get used furnace blowers at work all the time, now i'll have to snag one!

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InvisiblePirateSwazey
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Re: How I Built My Flowhood [Re: walfredo]
    #19809672 - 04/07/14 07:12 PM (10 years, 1 month ago)

Quote:

walfredo said:
Wow, that is pretty sweet man.  I get used furnace blowers at work all the time, now i'll have to snag one!



Grab a couple, I'm sure you could make some trades on here for them if you can get at a few :wink:


--------------------
 

BULK RYE PREP  -  MY FAVORITE THREADS  -  BUILD A FLOWHOOD


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