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Offlinemushpunx
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Re: Flow Hood Design Questions [Re: tombosley8]
    #24141067 - 03/06/17 12:03 PM (7 years, 3 months ago)

Quote:

tombosley8 said:
So wait, am I getting this right?

Is it better to use plexi glass(or similar) shields for my flowhood or no shields at all?

I understand it will reduce maneuverability but are there any other downfalls to this?

Could it create more turbulence or expose your work to more contams from bumping the sides?

I would like to have access to the table space on the sides the laminar flow without the shields in the way so I imagined making only 8" shields so they don't protrude too far.

Will these short 8" shields help? And if I were to make the top shield longer than the sides, say 12", would there be any problems with that?





I sugguest not building it with a hood at all. You can always add one later on out of whatever you want.


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Offlinemushpunx
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Re: Flow Hood Design Questions [Re: mushpunx]
    #24141082 - 03/06/17 12:08 PM (7 years, 3 months ago)

Oh also when you build this , if you've never worked with one be super careful of the filter face don't bump it or anything. Even a little bump will crush the pins like tin foil

Last year I was wrapping a plate and when the parafilm snapped my hand hit the filter , crushed a big spot :facepalm: - fortunately I was able to reshape the pins good as new


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InvisibleTheMadHatter420
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Re: Flow Hood Design Questions [Re: mushpunx]
    #24141176 - 03/06/17 12:55 PM (7 years, 3 months ago)

Glad to be warned about that. Looking at it, I was kind of sad they are they flimsy.


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Offlinetombosley8
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Re: Flow Hood Design Questions [Re: TheMadHatter420]
    #24141472 - 03/06/17 02:48 PM (7 years, 3 months ago)

I was planning on making a screen cover to protect the face as I learned the hard way how fragile they are with my last filter.Gr0wer's protect your filter tek

Thanks for the advice on not having hood, just wondering why others are opting for it?


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OfflineCapnZ
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Re: Flow Hood Design Questions [Re: maddchef]
    #24141488 - 03/06/17 02:56 PM (7 years, 3 months ago)

Quote:

maddchef said:
I'm just saying hood and walls so youre not creating eddys and you effectively create a sterile tunnel that no outside air even has a chance to mix with.

:whathesaid:

That's why I like having the "hood". When air flows out of the filter it creates turbulence on the edges of the laminar flow relative to the still(er) air around it. That can create mini vortexes which can pull contams from the outside air into the air flow around he edges. IMO the sides and top of the hood minimize this risk.


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Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...

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Offlinemushpunx
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Re: Flow Hood Design Questions [Re: tombosley8]
    #24141520 - 03/06/17 03:09 PM (7 years, 3 months ago)

Quote:

tombosley8 said:
I was planning on making a screen cover to protect the face as I learned the hard way how fragile they are with my last filter.Gr0wer's protect your filter tek

Thanks for the advice on not having hood, just wondering why others are opting for it?




Well I'm not saying don't build a hood, I'm just saying it something optional that can be added on later- it might make the FH design a little complicated/bulky

I can see why Grower uses a screen with that style filter
The regular style with metal pins/pleats are delicate but you just have to be careful is all.
I have mixed feelings about the screens, I worry that dust/contams might build up between the screen and the filter- but honestly I don't know enough about it to say one way or the other

I turn my hood on for min, then off, my filter face with lysol and let it sit for a another minute before letting it run
I suggest you do too it's a good habit


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Invisiblec10h12n2o
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Re: Flow Hood Design Questions [Re: CapnZ]
    #24141587 - 03/06/17 03:40 PM (7 years, 3 months ago)

that line of reasoning makes sense to me as well, and all pro models seem to have a hood/walls. built in lights might be nice, and the added protection from side drafts seems helpful.

the main cons of the walls/etc are that i have wide shoulders and would be a little restricted (not too bad though), the risk of dust/contam accumulation on the walls and roof/light panel, and not being able to store things like ziplocs, butane burner, markers, etc off to the side and have unobstructed access to them

i got my filter from FP, so it does have a metal face protector mesh , but i will be careful with it nonetheless

btw my digital anemometer came in, and it seems like i might be able to use it to measure the final flow speed, but i figured it might also be helpful for determining the cfm of these blowers.. does that make sense to anyone? it has a setting for cfm, where you measure the area of the output and flow speed. ive never worked with one before, but seems straightforward. so should i just hook up the blowers on low and measure them? i have read that many of these filters are not designed to be run with no resistance/pressure.. should i take any particular precautions or use any technique to determine what i need from the blowers?



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C10's Agar Guide + Tips and Tricks | c10's Flow Hood Build Guide


"Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing."

"Convictions are more dangerous enemies of truth than lies"
― Friedrich Nietzsche

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Offlinemushpunx
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Re: Flow Hood Design Questions [Re: c10h12n2o]
    #24141625 - 03/06/17 03:53 PM (7 years, 3 months ago)

From FP? Which filter do you have? Mines 18 x 24 from FP but no mesh


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Offlinetombosley8
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Re: Flow Hood Design Questions [Re: mushpunx]
    #24141630 - 03/06/17 03:54 PM (7 years, 3 months ago)

I was wondering if you could take a pic of the filter face for me so I can see the screen the pros use.


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Offlinemushpunx
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Re: Flow Hood Design Questions [Re: tombosley8]
    #24141647 - 03/06/17 04:03 PM (7 years, 3 months ago)



These aren't the best photos but they they show the screen some. Also here is a top view of my pre filter housing

I think this is the typical style filter , and then I've seen another type called "Micropleat"


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OfflineCapnZ
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Re: Flow Hood Design Questions [Re: mushpunx]
    #24141663 - 03/06/17 04:07 PM (7 years, 3 months ago)

OK I'm jealous of your anemometer. Now I have to get one.....:cheers:


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Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...

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OfflineCapnZ
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Re: Flow Hood Design Questions [Re: CapnZ]
    #24141675 - 03/06/17 04:14 PM (7 years, 3 months ago)

I use a propane torch to flame and keep it right beside the wall - flame your loop, and straight into the laminar air flow. Just remember you have a lit torch beside you....

Yeah I put a stainless steel floor (28 gauge) in my hood and painted the sides with 3 coats of high gloss white enamel to make it easier to clean inside. I like mushpunk's idea of hitting it with Lysol. I have also used a 10% CL solution, but spraying Lysol sounds way easier.


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Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...

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OfflineCapnZ
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Re: Flow Hood Design Questions [Re: CapnZ]
    #24141684 - 03/06/17 04:16 PM (7 years, 3 months ago)

Oh....storage. Get a wire rack to elevate your work area and then you can roll and store zip locks, Petri dish bags, and stuff under there and still be in the air flow.....


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Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...

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Offlinetombosley8
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Re: Flow Hood Design Questions [Re: mushpunx]
    #24141685 - 03/06/17 04:16 PM (7 years, 3 months ago)

I was looking for a pic of the filter c10h12n2oS has to see what he meant by his FP filter already has a screen.

sorry not using the reply/quote functions

punx, That is the style filter face I have and had on my old filter. I am skeptical about the screen for the reasons you stated but would hate to fuck up the filter face from a small accident.

Also the pre filter face is on the very top of the box correct?

My last hood I had the prefilter on the side and was wondering if that could draw contam into the flow more so than of it were on top like you have it.

What size box is that where your prefilter is connected?


I already made the blower housing to 20"x 20" and hoping that will be a big enough intake hole for the amount of flow I need on my bigass 3' x 4' filter. If my blower is powerful enough will that matter?


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OfflineCapnZ
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Re: Flow Hood Design Questions [Re: tombosley8]
    #24141717 - 03/06/17 04:28 PM (7 years, 3 months ago)

36 x 48 filter holy shit! Now thats a work area....


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Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...

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Invisiblec10h12n2o
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Re: Flow Hood Design Questions [Re: tombosley8]
    #24141727 - 03/06/17 04:35 PM (7 years, 3 months ago)

size of the blower housing? shouldnt matter as long as it is powerful enough, the housing is optional and usually just for mounting a prefilter or 3

I would snap a pic but its still wrapped up for protection till i put it in place. screen probably wasnt the right word, its just the metal mesh stuff that FP uses on their non-pleated filters. the pleated versions they sell and use in their series 1 hood does not have the metal

btw capn, is that steel workspace area installed in the pics you posted? maybe it is just reflecting white

does anyone know if that meter will be a good way to establish which blower i should use, and how much i need to restrict the intake, etc? I still dont have a motor controller, initially hoped id just get it dialed in on the right speed and leave it there, but if there is a strong chance i might need a controller (like swazeys router speed controller ) then i would like to order it asap so i can get this dang thing built this week... i have about 800 plates ready for transfers :/


--------------------

C10's Agar Guide + Tips and Tricks | c10's Flow Hood Build Guide


"Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing."

"Convictions are more dangerous enemies of truth than lies"
― Friedrich Nietzsche

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Offlinemushpunx
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Re: Flow Hood Design Questions [Re: c10h12n2o]
    #24141785 - 03/06/17 04:58 PM (7 years, 3 months ago)



My prefilter housing is just a box that goes over the blower , sealed with silicone. I cut the filter to size and drop it into place, and replace the boards across the top


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OfflineCapnZ
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Re: Flow Hood Design Questions [Re: mushpunx]
    #24141832 - 03/06/17 05:35 PM (7 years, 3 months ago)

Yo c10, yup the steel floor is in that pic, but it does to show up really well because it reflects the white sides.

My prefilter housing is prettty much just like mushpunx, sealed all around with silicone caulk and I took extra care to make sure I had a good tight fit framed around my prefilter.


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Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...

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OfflineCapnZ
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Re: Flow Hood Design Questions [Re: CapnZ]
    #24141837 - 03/06/17 05:36 PM (7 years, 3 months ago)

Does NOT show up....


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Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...

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Invisiblec10h12n2o
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Re: Flow Hood Design Questions [Re: CapnZ]
    #24142067 - 03/06/17 07:16 PM (7 years, 3 months ago)

i think i am gonna do my blower housing the same way, almost exactly. i might use weather stripping instead of screws and silicone though, so its removable for maintenance

i really like the finish on yours capn, and the steel. im gonna use either metal or glass for the work space, something that wont scratch and hold contams

still trying to figure out my blower stuff though, does anyone know any good way to decide between the blowers using that meter? im kinda nervous to run em without resistance, since ive read they are not meant to run without it


--------------------

C10's Agar Guide + Tips and Tricks | c10's Flow Hood Build Guide


"Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing."

"Convictions are more dangerous enemies of truth than lies"
― Friedrich Nietzsche

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