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ouuwee
Garden of Weeden



Registered: 03/22/20
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Flowhood questions
#26828466 - 07/17/20 08:57 AM (3 years, 6 months ago) |
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Using a SAB in this hot weather is killing me so I decided to finally get a flowhood. I've been searching around for a 12x24x6 and I just requested a quote from a popular filter company. They no longer offer wooden frames for their HEPAs. Their only options are plastic frame or metal, so which one should I get for the filter? Also, they are asking me what's the application for the filter and what is the CFM. What should I tell them? Do I tell them I'm using it to build a flowhood? Do I say 100 CFM or do I include the area of the filter (2ft x 1ft = 2ft squared x 100ft/min = 200ft cubed/min) and tell them 200 CFM?
(I'm looking for places that sell cheap filters, so if you have any suggestions please let me know)
Edited by ouuwee (07/17/20 09:04 AM)
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Stipe-n Cap


Registered: 08/04/12
Posts: 7,623
Loc: Canada
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Re: Flowhood questions [Re: ouuwee]
#26828542 - 07/17/20 09:28 AM (3 years, 6 months ago) |
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Get a metal frame. Tell them it's for laminar flow, they should know what you're talking about. You need 100ft/min @ at least .5" water guage. They should already know all of this once you tell them what the application is, tell them you're a gourmet mushroom farmer if you like.
The CFM is unknown and can be anything at this point, unless you already have a blower but I'm assuming that you do not. The important part at this point is ensuring the correct flow rate at the correct static pressure. Your CFM should come out between 200 CFM and 240.
Edited by Stipe-n Cap (07/17/20 09:37 AM)
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ouuwee
Garden of Weeden



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Quote:
p9hu7 said: Get a metal frame. Tell them it's for laminar flow, they should know what you're talking about. You need 100ft/min @ at least .5" water guage. They should already know all of this once you tell them what the application is, tell them you're a gourmet mushroom farmer if you like.
The CFM is unknown and can be anything at this point, unless you already have a blower but I'm assuming that you do not. The important part at this point is ensuring the correct flow rate at the correct static pressure.
Thank you. They recommended me to purchase the PURACEL metal aluminum separator filters. These are their options. What is the difference between standard and high capacity?
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Stipe-n Cap


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Loc: Canada
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Re: Flowhood questions [Re: ouuwee]
#26828562 - 07/17/20 09:40 AM (3 years, 6 months ago) |
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So the first one looks good. 12x24x6 250CFM@1"SP
Now it should be 100ft/min with those stats, just make sure before pulling the trigger.
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ouuwee
Garden of Weeden



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Quote:
p9hu7 said: So the first one looks good. 12x24x6 250CFM@1"SP
Now it should be 100ft/min with those stats, just make sure before pulling the trigger.
Thank you!!! Now on the lookout for a compatible motor... If I'm only going to tape a pre-filter on the intake (wont be building a small box for it), would that make the static pressure 1.2? So I would need to find a blower that can do at least 250CFM@1.2?
Edited by ouuwee (07/17/20 09:59 AM)
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Stipe-n Cap


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Re: Flowhood questions [Re: ouuwee]
#26828600 - 07/17/20 10:03 AM (3 years, 6 months ago) |
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Click the link in my sig, scroll down to the HVAC video and take a look at how pressure drop varies between different kinds of furnace filters. Your average filter is about .4"W.g if I remember correctly.
As long as there is a seal around the intake so that the flow is only going through the filter material and not running free along the sides you can be sure that the static pressure of the prefilter will remain true, not so if there are leaks from an improper seal. Better to use a box, that way you're not wrapping everything up with an ungodly amount of tape to keep it sealed.
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ouuwee
Garden of Weeden



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I think I'll pass on the pre filter since it will just make finding a motor more difficult. I'm looking at the 1tdt2 and 1tdt7 dayton. they both have similar CFM @ 1.0
1TDT2

1TDT7

Which one is more appropriate?
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Stipe-n Cap


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Re: Flowhood questions [Re: ouuwee]
#26828733 - 07/17/20 11:09 AM (3 years, 6 months ago) |
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The first one only pushes 210@1" SP, your filter requires 250@1"SP.
The 1tdt7 does 240 max. Both are under powered.
Confirm that the flow rate of that filter is 100ft/min at 250.
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ouuwee
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So I just heard back from the company and they quoted me $190 before shipping which is out of my budget. I found a different site that is selling a 99.97% wooden frame rating at ~$110 shipped. How much of a difference is 99.97 vs 99.99? Should I pay more for a 99.99% metal frame (about $180 shipped)?
I'm not sure if I could post links to the site I'm looking at.... if it's not too bothersome, can I PM you the links to see if they are good?
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Stipe-n Cap


Registered: 08/04/12
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Re: Flowhood questions [Re: ouuwee]
#26829838 - 07/17/20 09:55 PM (3 years, 6 months ago) |
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You can PM me if you want, brother, no problem. My recommendation however will always be to get the better quality equipment, you get what you pay for. Although it's $70 more it is worth the investment. You can definitely get by with the cheaper wooden frame filter, it will work 100% having said that...
Save for the extra month or however long that it takes, you have already invested this much time and effort into this hobby, don't cut corners.
That will always be my recommendation.
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Eclipse3130
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Just grab a pre built one, you can find 12x24s for fairly cheap I got mine for $600 Envirco model. Cuts out the time and hassle of building your own of course unless that's what you want to do, it will probably end up costing more and time
-------------------- "In The Material World One seeks retirement and grows Old In The Magical World One seeks Enlightenment and grows Wiser In The Miraculous World One seeks nothing and grows Lighter As we all tread the Homeward Path we will explore many Realms And one day... we will all Realize that all experiences are Simply Different ways in which The All-That Is Perceives Itself"
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southbounpachyderm
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Re: Flowhood questions [Re: ouuwee]
#26830052 - 07/18/20 01:10 AM (3 years, 6 months ago) |
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Quote:
ouuwee said: I think I'll pass on the pre filter since it will just make finding a motor more difficult.
Do not pass on the prefilter if you want your flowhood to be effective for a long time.
Mine has been in daily use for almost 1.5 years with no noticeable changes in flow. The prefilters have to be replaced once a month because they start to hinder flow and they are really dusty and full of different particulate material. If I had just let that junk in I bet I would have had to replace that flowhood months ago.
Edit: my flowhood is a 24x36x6. a smaller one would have accumulated more filth much faster.
Edited by southbounpachyderm (07/18/20 01:13 AM)
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w00tmycelium
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When you say prefilter, is that charcoal or HEPA or both?
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southbounpachyderm
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Quote:
w00tmycelium said: When you say prefilter, is that charcoal or HEPA or both?
Simple furnace filter. I opt to use merv 13 filters because my blower is overpowered for my filter and it can handle the extra pull.
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w00tmycelium
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Sounds like a good setup, MERV 13 should be plenty for a prefilter by far (to me at least.)
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mushpunx
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Re: Flowhood questions [Re: ouuwee]
#26832753 - 07/19/20 03:35 PM (3 years, 6 months ago) |
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You are going to want to use a prefilter. It will add years to a HEPA. I just use simple Filtrete furnace filters, doesn't have to be anything fancy.
First check your HEPA specs and see what the WG is at 200CFM, that will be your static pressure.
Then look at the blower specs for your prospective blower and see what it pushes at your HEPA's SP (plus estimate 0.2SP for a prefilter).
On my 12 x 24" Flow Hood I am using the Dayton 1tDT2. Seems to be a good blower for these. My HEPA has an SP of 0.8" @ 200CFM. My blower pushes 360CFM @ 0.8"SP and either 220 or 240CFM @ 1.0SP (adding 0.2" for the prefilter.) It's really hard to read that graph.
--------------------
 Amateur Mycologists United AMU Q&A
Edited by mushpunx (07/19/20 07:24 PM)
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ouuwee
Garden of Weeden



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Re: Flowhood questions [Re: mushpunx]
#26832770 - 07/19/20 03:49 PM (3 years, 6 months ago) |
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So I'm thinking about purchasing the Glasfloss 1100 Series 99.99% HEPA FILTER METAL FRAME 24 X 18 X 5 7/8 for about $216 shipped. Good price or are there better deals? Looking for recommendations!!! I looked up the specs and I'm not really sure what these numbers mean.
Edited by ouuwee (07/19/20 04:08 PM)
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Stipe-n Cap


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Re: Flowhood questions [Re: mushpunx]
#26832776 - 07/19/20 03:52 PM (3 years, 6 months ago) |
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I'm not sure why everyone thinks that 1" furnace filters are only .2 inWG, each filter will be different but you're more than likely adding .4 to .5 inches of static pressure. Half an inch is pretty significant.
Also, not all 12x24 filters are the same either, eash one will generate a different amount of resistance. If he has 100ft/min at 250CFM with 1"SP then both of those listed blowers are under powered even without a prefilter. My point is that you can't recommend the same blower for every filter that has a similar surface area.
Ouwee
My recommendation is to stop trying to sort through the bargain bin for filters. Flowhoods are a somewhat significant investment, expect to spend money. The reason I'm saying that is because you're going to drive yourself crazy trying to read information that doesn't make any sense to you, buy a filter meant for a laminar flow application and drop the dead weight of uncertainty. All HEPA are not created equal.
My recommendation is to grab a FFU from myers mushrooms:
https://myersmushrooms.com/
Grab a filter and blower from FP:
https://fungi.com/apps/omega-search/?type=product&q=Hepa*
Or ask one of the nice chaps around the forum with a baller hood to shoot you a link.
Edited by Stipe-n Cap (07/19/20 04:12 PM)
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ouuwee
Garden of Weeden



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I've always been a frugal guy. I only buy things that I would make good use of and I don't mind paying the money for it. After hearing about how small 24x12x6, I decided I'll be getting the bigger 24x18x6.
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Stipe-n Cap


Registered: 08/04/12
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Re: Flowhood questions [Re: ouuwee]
#26832820 - 07/19/20 04:15 PM (3 years, 6 months ago) |
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Think of it like this, you're not just investing in a laminar flow unit but also all of the time, effort, and materials that you place in front of it over time. You are relying on your equipment to be functional and reliable. If you make a poor investment now by either purchasing incorrectly, purchasing too small or whatever the case is, it will have consequences down the line. Spend big once and have the peace of mind that comes with it.
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