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Invisiblethallus
Stranger thanyou

Registered: 08/15/06
Posts: 629
Loc: Hiding in Plain Sight
flow help
    #6317838 - 11/29/06 07:12 AM (17 years, 4 months ago)

I was thinking about making a flow hood. There was an old circular in-line duct centrifugal fan at an old job so I picked it up. Do you think it would do? and how big should the hepa be (max an min size would be good)? . The fan is vt 100 I think which is the smallest in this range ( http://www.chaysol.com/en/products_004.html )so I guess its air flow would be around 290m3/hr.All models are fully speed controllable using either electronic or autotransformer voltage regulation controllers but I'm not sure if that will be much help to me. Any help would be good. cheers thallus.
p.s. if you need more info I will try to help but it has no instructions

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OfflineRogerRabbitM
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Re: flow help [Re: thallus]
    #6318376 - 11/29/06 10:19 AM (17 years, 4 months ago)

Most inline duct fans can't produce rated flow at the static pressure you will be running at. In addition, the motor is generally the cheapest part of a flowhood, so I wouldn't suggest trying to build a hood around the motor, even if you have a free one.

I wouldn't go for less than a 12" X 24" flowhood.
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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InvisibleSemilanceata
No god, no boss

Registered: 05/26/03
Posts: 841
Loc: República Federal Íbera
Re: flow help [Re: thallus]
    #6318396 - 11/29/06 10:25 AM (17 years, 4 months ago)



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Sr_Setahongo

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OfflineFreeSporePrints
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Posts: 1,139
Loc: Rome, Italy Flag
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Re: flow help [Re: Semilanceata]
    #6318912 - 11/29/06 02:10 PM (17 years, 3 months ago)

You should choose first a HEPA filter then a blower.

A mounth ago i planned to built one but for now i haven't money.

I suggest to read DEEPLY the link that Semilanceata gave you and follow the suggest of RogerRabbit.

You'll need to:

- find a good HEPA filter at least class H14 (also H13 works but far better h14) and make the calculations

- find an appropriate blower based onto the features of the HEPA.

- if you don't have a glovebox build first one, improve yourself, then  build a flowhood.

If you'll follow the links of www.fungifun.org you can read also another tutorial made by another grower (but of Orchideas)

If you email Anno of fungifun for questions he/she'll answer you.

Good luck! :sun:

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OfflineMycoMaster83
FlowHood Builder& HPoo Wrangler
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Registered: 10/28/06
Posts: 46
Last seen: 17 years, 3 months
Re: flow help [Re: FreeSporePrints]
    #6319207 - 11/29/06 06:45 PM (17 years, 3 months ago)

I've built many of them, and definitely listen to RR and FreeSporePrints. They're easy to build if you have a basic understanding of tools and math. Here's what I use for mine:
HEPA's from here: http://www.hepafilters.com/Cleanroom_Filters_Supplies.htm

Blowers from here:
http://www.grainger.com/Grainger/wwg/pro...t+Drive+Blowers

And, I use 7-ply 3/4" birch plywood from Lowes or Home Depot. It's about $40 a sheet.

Tools:
- Table saw
- Jig Saw
- Drill w/phillips bit
- Wood screws
- LockTite Power Grab and caulk gun
- Furing Strip
- Possibly clamps


I would reccomend going with a 18x24x6 filter or larger myself. When I first started doing this I made one with a 12x24x6 filter and was simply too small. I sell mine from time to time, always have a few on hand. Here's one going together:



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Invisiblethallus
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Re: flow help [Re: MycoMaster83]
    #6320167 - 11/30/06 12:28 AM (17 years, 3 months ago)

Could anyone give me a good link for a blower in the uk one that would be good to make a 12" X 24" flowhood.

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OfflineFreeSporePrints
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Re: flow help [Re: thallus]
    #6320481 - 11/30/06 04:20 AM (17 years, 3 months ago)

Is impossible to give you a link to suggest a blower. Not all the HEPA are the same and have got the same features. Sorry for the bit "Crankey mood" but to grow edibles is necessary a lot of study.This doesn't mean that is difficult to grow them!(See people -for example- as micololo2 or RogerRabbit where their hobby has let them all and what they're doing.)

For a correct blower you must see the features of it adapting it to the virtual necessity of your HEPA.

If you make your calculations of the static pressure and of all the stuff (i don't remember cleary now) paste here and someone of cuorse will help you.

I repeat read the tutorial on fungifung.org and the others threads here on shroomery.org, pick a paper, a pen, open the calc.exe of windows and proceed slowly :smile:

Try to ask if MycoMaster83 has got a flowhood to sell if you want to save your time from calculations and assemblement.

For any help make all your questions here. But before read a bit!

IMHO Stand firm! :sun:
Fabio

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OfflineRogerRabbitM
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Re: flow help [Re: FreeSporePrints]
    #6320972 - 11/30/06 10:11 AM (17 years, 3 months ago)

A 12 X 24 filter will require a blower of 250 to 350 cfm(cubic feet per minute)at 1" static pressure. You'll need to convert that to metric and check with local suppliers. Squirrel cage type blowers used in home furnaces generally are sufficient for a flow hood. If it blows too much, you can use a motor speed controller(NOT a lighting dimmer) or place cardboard or something similar over the intake to block off part of the incoming air. You'll have the right flow in front of the hepa when a candle or cigarette lighter is placed in front of the filter and the flame bends over 45 to 90 degrees, but doesn't get blown out.
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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Invisibleagar
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Re: flow help [Re: RogerRabbit]
    #6321736 - 11/30/06 02:53 PM (17 years, 3 months ago)



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InvisibleCorporal Kielbasa

Registered: 05/29/04
Posts: 17,235
Re: flow help [Re: Semilanceata]
    #6321777 - 11/30/06 03:04 PM (17 years, 3 months ago)

Quote:

Semilanceata said:
This might help too:
http://www.fungifun.org/English/Flowhood




I was thinking about posting that! :cool: :thumbup:

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OfflineMycoMaster83
FlowHood Builder& HPoo Wrangler
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Re: flow help [Re: Corporal Kielbasa]
    #6323539 - 12/01/06 07:50 AM (17 years, 3 months ago)

That's a good point about the dimmer switch too...

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Invisiblethallus
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Registered: 08/15/06
Posts: 629
Loc: Hiding in Plain Sight
Re: flow help [Re: MycoMaster83]
    #6323648 - 12/01/06 08:39 AM (17 years, 3 months ago)

Ok back to the drawing board. HEPA first, fan second. One problem I have had is we don't call that type of fan a "Squirrel cage type blower" so thanks MycoMaster83 for the link it made it easier to find one in the uk. Cheers everyone I hope to get a pic up when I all done.

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OfflineMycoMaster83
FlowHood Builder& HPoo Wrangler
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Re: flow help [Re: thallus]
    #6324951 - 12/01/06 04:31 PM (17 years, 3 months ago)

No prob, have you found a good HEPA in the UK yet?

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OfflineJSshroom
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Registered: 06/16/05
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Re: flow help [Re: Corporal Kielbasa]
    #6328585 - 12/02/06 09:41 PM (17 years, 3 months ago)

http://cgi.ebay.com/New-Stainless-Steel-...9QQcmdZViewItem

need a little assistance.  I have seen a lot of different filters.  agar says that 12 inches thick is standard but I have seen more 6 inch filters then 12.  Do I need this pre-filter that costs more then the actual filter?
Does this filter look like a quality product.  I have found one on another site that is quite a bit more but it has an aluminum frame. 

any suggestions.  not in a big hurry or anything.  money is not an issue, but I do not want to have to spend money I do not have too.  Also space is a little limited.  I wish there was a better tek for agars overhead flowhood.  it looks like flowhood parts for a clean room which is in essence what I would like to build onto my first lab.  So it will be a combination of fruiting and I can do all my culture work over it.  any feedback appreciated


--------------------
First Grow No more carpet tek

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OfflineFreeSporePrints
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Re: flow help [Re: JSshroom]
    #6329373 - 12/03/06 01:50 AM (17 years, 3 months ago)

Hi there JSshrooms :smile:

Not all the HEPA are projected in the same way, here in Italy i've found ALWAYS filters with deep of 6 CENTIMETERS!! And they work too!

You need in EVERY CASE a pre filter to stop the dust, fur, hair...for this you can use the polyfill filter of the furnaces that has got (quoting Anno) a static pressure of 0,1".

Imagine:

Sterile flow ~ ~~ ~ ~~ <- [HEPA FILTER] <- (BLOWER) <- [PREFILTER]  <- Not Sterile air

If you can spend money (too i, damn!) you can easily work with a glove box. More cheap more little. If you look a bit of threads ago there the cheap glove box of Bluehelix (he said had got success at 100%) or you can see also the glovebox of others users ( http://www.shroomery.org/forums/search.php?Cat=  insert glove box and then glovebox )

Have fun!
Fabio :sun:

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Invisibleagar
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Re: flow help [Re: JSshroom]
    #6330591 - 12/03/06 04:10 PM (17 years, 3 months ago)


I bought this clean room ceiling unit housing off ebay
($125 + s/h which was another $80).
Housing has DEXON fan motor built in & speed control.
Housing is made for a standard 24X48X6 hepa or ulpa filter.

Which, I also bought off eBay
($75 + s/h of about $50).

Prefilter frame size was 24X24.

I simply used doubled furnace filters.
Also added a thin layer of PP cloth, to improve prefilter efficiency.

One trip to Lowes.
Bought 4X8 sheet of washable kitchen paneling about 3/16ths thick.
Bought 1/2 inch thick, 3 inch wide stiff molding, for legs.
One leg in each corner, one in the center of back span.
Bolted to housing.
Then, cut paneling to fit, snug.
Used liquid nail adhesive to attach molding to legs.
Sealed all joints with silicone sealer.
Set unit on glass covered tabletop.

Turned it on.
Tested laminar flow:

Sprayed Oust in the room air.
Allowed purge 15 minutes.
Tested with agar/perti plates.
WORKED PERFECT. :grin:


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Invisibleohmatic
searcher
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Registered: 02/28/04
Posts: 6,742
Loc: europe
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Re: flow help [Re: agar]
    #6330632 - 12/03/06 04:28 PM (17 years, 3 months ago)

nice agar :smile:

here's mine:


--------------------
:penis: MONOTUB tek :sun: HEATBOMB tek :penis:

RIP #cultivation! ....can't associate? well FUCK U !

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