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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: So you're building a flowhood? [Re: micelio]
#26736579 - 06/11/20 10:57 AM (3 years, 8 months ago) |
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That was my original recommendation if his flow chart was correct, it will be under power by a long shot if the label is correct.
Go with the label.
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fungusmuncher
rabbit chaser



Registered: 03/07/09
Posts: 1,068
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26736586 - 06/11/20 11:00 AM (3 years, 8 months ago) |
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Yea I'm sizing one up for the label right now but having a hard time finding one that does 400-500cfm at 1.1. Most blowers drop off fast when the pressure is that high.
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Yes I had the exact same problem, that's why I went with a centrifugal fan. There doesn't seem to be a middle ground with squirrel cage fans, they do low SP and very high SP with high CFM.
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micelio
Song of Silence


Registered: 04/22/14
Posts: 1,547
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26736688 - 06/11/20 11:56 AM (3 years, 8 months ago) |
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I know allot of people are not happy with Fungi Perfecti.
But there's a reason why they're using the Dayton 1TDU2 for their 24"x18"x5.8 to the 24"x36"x5.8"..
I'm happy with both my filters with the 1TDU2.
I have to restrict the air flow at the Intake on both filters to get the right airspeed for my liking. No big deal.
The more I restrict the flow the less amperage I consume. My 2 1TDU2 are fairly quiet units. I got mine off of e-bay.. 6 years ago..
They're going for 260.00 with free shipping now. at e-bay
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: So you're building a flowhood? [Re: micelio]
#26736729 - 06/11/20 12:20 PM (3 years, 8 months ago) |
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He needs 500CFM blower @ ~ 1.1" SP

The 1TDU2 sheet is posted above, as you can see the 1TDU2 is over powered. FP is fucked, maybe it's appropriately matched to their filter (which they will not supply the flow chart for) but it isn't the appropriate match for the above mentioned filter.
As I mentioned in the OP:
Quote:
Blocking the air intake of your blower excessively will put unnecessary strain on the motor and will likely effect it's lifespan/efficiency. Chocking the intake can be done within reason however I suggest getting as close as possible to the proper output without choking the intake. No need for six prefilters to close the gaps of incomplete planning.
The 1TDU2 has almost twice the required CFM.
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fungusmuncher
rabbit chaser



Registered: 03/07/09
Posts: 1,068
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26736839 - 06/11/20 01:14 PM (3 years, 8 months ago) |
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I came across this inline fan that might fit the bill. at 1.0 it pushes 468cfm and at 1.25 it's at 408cfm. I read somewhere that inline fans don't work well for this application so I've been focusing my search on squirrel cages fans but I think this might work.
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Inline fans work just fine. That fan looks gtg
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micelio
Song of Silence


Registered: 04/22/14
Posts: 1,547
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I did a search on vtx800.
I like educating myself and always looking for a better way and cheaper.
Flow Hood Build: Centrifugal fan vs portable blower
https://www.shroomery.org/forums/showflat.php/Number/24439330
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: So you're building a flowhood? [Re: micelio]
#26737008 - 06/11/20 02:55 PM (3 years, 8 months ago) |
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Not sure what you're getting at? Are you saying that an inline centrifugal fan won't work? Many people on this site use one, check out edmunters build.
Don't use a portable blower though, this should be common sense.
https://www.shroomery.org/forums/showflat.php/Number/26187961/fpart/1/vc/1
I'd say his grows have turned out just fine.
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micelio
Song of Silence


Registered: 04/22/14
Posts: 1,547
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26737144 - 06/11/20 04:04 PM (3 years, 8 months ago) |
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No I'm not saying It won't work. by reading other people post you can get the pro and cons.
The vtx800 Is not cheap That's for sure. check out e-bay.
I read a few reviews on the vtx800 and they're noisy what some say and a few of them say they're quiet.
I have a 6 inch inline, I don't know the brand, I use It for air exchange when growing oysters. It's very noisy.
From what I can see Is they're more expensive than the Dayton 1TDU2.
Then what has cross my mind Is the vortex Issue some are talking about.
My opinion Is there's nothing wrong with be over powered and choking the Intake down with the squirrel cage type blower. I been running my two 1TDU2 for six years now daily and It runs like a sewing machine. Never giving me a problem and somewhat quiet to the ear..
My 2 cents...!
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: So you're building a flowhood? [Re: micelio]
#26737158 - 06/11/20 04:11 PM (3 years, 8 months ago) |
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To each their own. Mine cost me $1500 so a few hundo seems cheap by comparison.
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fungusmuncher
rabbit chaser



Registered: 03/07/09
Posts: 1,068
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26737421 - 06/11/20 06:04 PM (3 years, 8 months ago) |
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Well the 1TDU2 will be arriving tomorrow. I'm thinking I'll return it and buy the vtx800 or even the vtx1000 and dial it back on a controller if needed.
I thought about choking the intake on the 1TDU2 but I would probably have to cut it down by almost 50%. Don't know if that will affect the longevity of the blower.
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Good luck on your build, looking forward to the pics.
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fungusmuncher
rabbit chaser



Registered: 03/07/09
Posts: 1,068
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26789508 - 06/28/20 10:46 AM (3 years, 7 months ago) |
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Here she is, I'm so damn happy right now I could cry. Doing some testing to try and dial the fan in for optimal flow. The lighter is around 6 inches in the pic with the fan dialed back a bit. Thank everyone here for the help. There is no way I could have done this without the knowledge obtained within these threads of gold. Heading out to look for a taller platform to make sure I'm staying in the flow, my cooling rack is a bit too short. What angle do you guys think the flame should be at and at what distance from the filter?

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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Nice job, looks like everything worked out well
The lighter works fine and I know what I'm about to say is a tad contentious but if you really want to know what's going on with your flow I'd buy an anemometer, it's only ~$25 or so. You'll get turbulence where the flow drops off from 100ft/min, a lighter won't really tell you with any kind of real accuracy. In a hobby where attention to detail is paramount it seems odd that a lighter flame is held in such high regard when measuring airflow.
Whipe we're talking about your flow rate it may be pertinent to mention your flow will obviously break down due to obstacles creating turbulence as well, so be aware of that when stacking bags or jars in your work space, just because something is in front of the hood doesn't mean that it's necessarily within sterile flow.
Edited by Stipe-n Cap (06/28/20 11:33 AM)
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,384
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26789579 - 06/28/20 11:14 AM (3 years, 7 months ago) |
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A $25 anemometer aint worth a cat turd for flowhood measurements. They have a +/- of like 50 fpm which is totally unreliable.
That looks great man dont fuck with it anymore.
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fungusmuncher
rabbit chaser



Registered: 03/07/09
Posts: 1,068
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Re: So you're building a flowhood? [Re: Stipe-n Cap]
#26789583 - 06/28/20 11:16 AM (3 years, 7 months ago) |
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Right on I'm looking around for one now, hopefully I can find one local.
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,384
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Re: So you're building a flowhood? [Re: sandman420]
#26789593 - 06/28/20 11:19 AM (3 years, 7 months ago) |
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If you are stacking bags or otherwise crowding your flowhood you are not using it correctly that is good advice p9hu7. I know someone going to show me a picture of how they stuff 29 bags in their 24 inch hood by literally building a wall and it "works for them" but guess what that's real stupid and a smoke test would show all of the backwash going in the flow right up the bags butts.
I see Tera Universal has totally ripped off the Baker EdgeGard now that the patent has worn off ehhh? Bastards.
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: So you're building a flowhood? [Re: sandman420]
#26789615 - 06/28/20 11:32 AM (3 years, 7 months ago) |
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Ok,so buy one for $150 then  I haven't used one since sniper course so I honestly don't know what the margin of error is on a low end model. My point was if you want to be accurate then a lighter seems pretty darn analog when compared to a digital instrument.
Good call though sandman, if you purchase a digital instrument be sure to check the accuracy/margin of error first.
I wouldn't worry about it though, you matched your blower and filter correctly so it's gtg
@sandman...yeah you see plenty of commercial and hobby farmers cramming their work area, it's definitely not best practice.
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,384
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Re: So you're building a flowhood? [Re: sandman420]
#26789656 - 06/28/20 11:50 AM (3 years, 7 months ago) |
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For all of you friends out there cooling walls of bags in front of your flowhoods and do not have a Baker EdgeGard or aparantly this terra rip off...You are doing yourself a disservice. Bags do not need to be cooled off in front of a flowhood if you are preparing them in a particular way. You may be familiar with "Pasteurs experiment" wherein micro-organisms are unable to travel up a curved neck of a flask to infect a broth

Now if you prepare a bag in the common way of simply filling it up with grain to a certain point and then folding the top down so that it sits on its own top you literally have an inherent filtering system exactly like this.

OK so now you take that same bag and you throw it into a wall in front of the flowhood and suddenly you can not take advantage of this inherent filter because you are forcing air which probably contains backwashed dirty room air all around it.

I have been cooling my bags by simply opening the top of the pressure cooker in regular room air after about 20 minutes after the pressure comes to 0. Let it sit for about 4 + hours to cool a decent amount. Then you can grab them in a certain way by the fold that does not disturb or unravel the top to move them to a tub or a shelf to cool the rest of the way. Then move to hood 1 at a time to inoculate.
Edited by sandman420 (06/28/20 11:55 AM)
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