How Ozzy builds his flowhoods

Discussion in 'MYCO-TEKS' started by Ozzy, Nov 11, 2012.

  1. Ozzy

    Ozzy Moderator Moderator Mushroom Doctor Cannabis Doctor

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    So there are questions alot about how to build flowhoods, Evil went the squirrel cage , I choose to go with the inline version. so lets start shall we?

    price range, between 300- 600 bucks depending on your efforts of pricing materials and how fancy you want to get.

    Materials:

    2*4 to hold the fan in place
    014.jpg

    2.5 in screws to attach the 2*4's to box

    Inline fan of your choosing to match the filter you have, always match the filter to the fan or vice versa I have an 800cfm, cause that's what I had laying around

    015.jpg 016.jpg

    A speed controller to dial in the speed if it's a bit strong

    007.jpg 008.jpg

    your filter..I went with a fungi perfecti

    013.jpg 012.jpg 011.jpg

    Wood to make the box..I splurged and got a thick veneered plywood you can use thinner material, but then you have to make a separate frame to support it all.

    some thinner stock to make the stops that your gasket from the filter will sit on.
    001.jpg

    wood screws
    small drill bit and countersink, always pre-drill your holes, if you don't wood screws tend to not bite correctly and can leave a space between the adjoining materials

    Drill bit the size of the power supply cord for the fan.

    Stain, you want your new toy to look handsome don't you?
    Poly, you want your finish to last forever

    Handles, you want to be able to move this guy around comfortably.
    003.jpg

    Pre filter, this is important as it will vastly increase the life of your hepa, these are to be changed every 6 months or so. get a good one, they cost about 20 bucks just mount to the top of the box above your fan, some people tape them down, I just let mine rest on top, the force of the fan seems to hold it down well enough for me.
    004.jpg

    The build:

    take your 4*8 sheets of plywood and cut them down to the size of your filter and deep enough to accommodate your fan, In my case,

    the side panels are 25.5 in
    top and bottom panels are 24 in
    the back panel is 25.5*25.75 in

    Then measure the depth of your filter and screw in the stops about a 1/16 of an inch shorter to the front of the box,
    this will give you pressure against your gasket and keep everything airtight.


    cut a hole the size of your fan opening in the top of the box, make sure the placement of the fan does not bump into the filter.

    Drill a hole in the side of the box to accommodate the power supply of the fan. this hole should be caulked around one the supply is in place for air leakage.

    Assemble the box, remembering to pre drill all screw locations.

    caulk the seams of the box with silicone and allow to dry

    Mount the fan with 2 2*4's as it as snug as you can, you don't want to listen to this thing rattle once it is put together. caulk the space between the rim of the fan and the wood AFTER you stain and the box is fully assembled from the outside, if you do it before hand, the stain won't take and you will have an unsightly area that is not stained.

    005.jpg
    place your filter in the box resting the gasket against the stops. the air flow arrow might be in the wrong direction, but it does not matter , one side is as good as the next.

    cut some 1*2's for the trim that will hold the filter into the box.
    002.jpg

    Stain the box, allow to dry

    poly the box, allow to dry

    Attach the handles to the sides in a spot that is comfortable for you to carry. and viola, you are now a full blown DIY mycologist with the coolest toy ever. Congrats

    View attachment 32024 View attachment 32025
     
    Last edited: Nov 11, 2012
  2. maxamillian1989

    maxamillian1989 New Member

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    i hve 2 ?were did u get that filter and is sp an wg the same thing
     
  3. mycborg

    mycborg Well-Known Member Supporter

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    Nice write up Ozzy :super:
     
  4. rogue

    rogue ♥ Hooked on Mycelium ♥ Moderator Mushroom Doctor Supporter

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    pretty much the same thing

    water column (w.c.)
    water gage (w.g.)
    static pressure (s.p.)
     
  5. John.Jingleheimersschmidt

    John.Jingleheimersschmidt Member

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    Love the compact design here. Much more practical and usable than some others I have seen. Thanks for this write up!
     
  6. 3sheets

    3sheets melody maker

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    John is a chick?? (Sheets is confused*)
    Hey , we have a resident hottie here, her name's jeff!

    Omg I'm on fire today!
     
  7. Jeff

    Jeff Well-Known Member Moderator Mushroom Doctor Supporter

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    Watch it.
     
  8. Fulano

    Fulano Member Supporter

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  9. GGTBod

    GGTBod One chance at life and this is it so lap it up Administrator Cannabis Doctor Cacti Doctor

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    Awesome build Ozzy and equally excellent instructions, I can buy a new one for £600 but i'd love to build one for less, my stumbling block everytime i try to price the parts is the bloody high powered fan.

    One of these seems my best option

    would that do the job?
     
    Last edited: May 11, 2013
  10. rogue

    rogue ♥ Hooked on Mycelium ♥ Moderator Mushroom Doctor Supporter

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    I'm not sure how well the fan design(blades) will work with back pressure (SP)???

    I went to their website to check out the specs but they want me to fill out a Download Request Form to be able to download the Brochure :facepalm:
    which probably contains no more than what's on their site.
     
  11. GGTBod

    GGTBod One chance at life and this is it so lap it up Administrator Cannabis Doctor Cacti Doctor

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    No worries mate it is just the kind of comedy i keep coming accross when trying to find the right blower to build one, i can get an 800cfm fan squirrel blower thing but they are £350, can't find second hand for shit, i remember i think it was Someguy saying air con referb companies are good places to score, still looking but i think i am just gonna have to bite the bullet and cough up the £600, it does come with 5 year onsite service and warranty so it should be worth the buy, saving pennies everyday i can lol
     
  12. 3sheets

    3sheets melody maker

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    Nice write up man!


    (( Jeff you know I love you (its easy!)
    I must hide my pain of not being able to afford parts! ))
     
  13. Jeff

    Jeff Well-Known Member Moderator Mushroom Doctor Supporter

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    Just playing.
     
  14. RUE

    RUE New Member

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    Is this fan just as good as a Dayton? What’s the difference between squirrel cage and in-line? They both perform the same?
     
  15. Sternerz fox

    Sternerz fox New Member

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    Hello fellow myco crew. I am new here and stumbled on this forum. I have been building my flow hood as a complete amature and haven't stuck to any specks but have done this without a penny spent so far. main things I went in search for were heap filter and fan.
    so I often explore abandoned places and if you know where to look you could find some real goodies, follow the air duct and you will find heap.
    As for my fan I pop down to my local Howdens where they just chuck out perfectly good extraction fans for cookers. I just found a brand new one with a dent in the hood but its smaller, quieter and more powerful then the one I have fitted now all I did was revert the fan to blow instead of suck and it works pretty well. I also have some random features that I would like to share and get some opinions. photos to follow
     
  16. n0j0y

    n0j0y Active Member

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    Probably would make sense to start your own thread since this is a thread about how he did his.

    Personally I'd be be hesitant reuse a found HEPA filter as who knows how dirty it is and it is kinda key to sterilization.