Home | Community | Message Board

World Seed Supply
This site includes paid links. Please support our sponsors.


Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Shop: PhytoExtractum Maeng Da Thai Kratom Leaf Powder   Kraken Kratom Red Vein Kratom

Jump to first unread post Pages: 1 | 2 | Next >  [ show all ]
OfflineGTEED
Stranger


Registered: 12/02/19
Posts: 99
Last seen: 2 years, 10 months
Flowhood items. Advice so far.
    #27084333 - 12/11/20 04:58 PM (3 years, 1 month ago)

Alright so here are my two choices I plan on going with. For building myself a flowhood.

option 1- Damn filters 24x24x6 99.99% .79"W.G resistance 700CFM flow rate
https://damnfilters.com/collections/hepa-and-other-high-efficiency-filters/products/hepa-filter-24-x-24-x-6-700-cfm-99-99-particle-board

option 2- Earthstongue 24x24x6 99.99% .9 W.G 625CFM @ 1"
https://earthstongue.com/product/24_x_24_x_6_HEPA_FILTER_REPLACEMENT

Prefilter - Filtrete 1500 Ultra Allergen 12x12x1
https://www.amazon.com/Filtrete-Healthy-Allergen-Reduction-Furnace/dp/B00TUDHV8C

(assuming this filter is .21 static pressure - according to https://www.iallergy.com/pages/compare-3m-filtrete-filters)

Plywood - 3/4-in Birch Plywood, 4' x 8' 5ply

All I need now is a blower that will work with the above items.
(Wondering if Dayton 1TDT8 would be a good fit. -
https://images-na.ssl-images-amazon.com/images/I/71XMM5KjJ7L.pdf
https://www.amazon.com/Dayton-1TDT8-Blower-115V-3-30/dp/B000TK3ZM6)

Does anyone have any suggestions for me so far?


Edited by GTEED (12/11/20 09:52 PM)


Extras: Filter Print Post Top
OfflineFungusFreedom
Stranger
Male User Gallery


Registered: 08/21/20
Posts: 39
Loc: Midwest
Last seen: 1 year, 11 months
Re: Flowhood items. Advice so far. [Re: GTEED]
    #27084423 - 12/11/20 05:46 PM (3 years, 1 month ago)

Do you plan on using a pre filter? It will prolong the life of your hepa so probably a good idea. If so add 1.2 to your resistance. For the second cheaper option that puts you at about 1. For the 24x24 you need 400cfm. According to the 1tdt8 graph that puts you very close maybe just a tad shy. I have an 18x24 and that is the blower I went with. I would check the next stronger one to see if it is better.


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


Extras: Filter Print Post Top
OfflineGTEED
Stranger


Registered: 12/02/19
Posts: 99
Last seen: 2 years, 10 months
Re: Flowhood items. Advice so far. [Re: FungusFreedom]
    #27084783 - 12/11/20 09:48 PM (3 years, 1 month ago)

Yes, I plan on using one of the prefilters I listed above. hmm I wonder if I should just go with a 18x24x6 then. I'm having a hard time for some reason figuring all this out :P Does anyone have any experience with Damn filters or earthstounge? I'm wondering how the quality is.


Edited by GTEED (12/11/20 09:49 PM)


Extras: Filter Print Post Top
OfflineGroo
sola dosis facit venenum
 User Gallery


Registered: 12/06/14
Posts: 2,310
Last seen: 21 days, 7 minutes
Re: Flowhood items. Advice so far. [Re: GTEED] * 1
    #27084797 - 12/11/20 10:20 PM (3 years, 1 month ago)

Find a fan that will get you MORE than 100 on its highest setting if possible. So try to find a 2 speed fan if possible. with the low speet matchign this one and the high speed giving you 150-200 cfm if its not over the limit of the filter.


Extras: Filter Print Post Top
OfflineGroo
sola dosis facit venenum
 User Gallery


Registered: 12/06/14
Posts: 2,310
Last seen: 21 days, 7 minutes
Re: Flowhood items. Advice so far. [Re: Groo] * 1
    #27084801 - 12/11/20 10:25 PM (3 years, 1 month ago)



Edited by Groo (12/11/20 10:29 PM)


Extras: Filter Print Post Top
OfflineGTEED
Stranger


Registered: 12/02/19
Posts: 99
Last seen: 2 years, 10 months
Re: Flowhood items. Advice so far. [Re: Groo]
    #27084841 - 12/11/20 11:31 PM (3 years, 1 month ago)

with this filter -
https://earthstongue.com/product/24x12x6-HEPA-FILTER-REPLACEMENT

does anyone what it means by 625cfm @ 1"?
is that stating that i need a blower that can provide that?


Extras: Filter Print Post Top
OfflineFungusFreedom
Stranger
Male User Gallery


Registered: 08/21/20
Posts: 39
Loc: Midwest
Last seen: 1 year, 11 months
Re: Flowhood items. Advice so far. [Re: GTEED]
    #27084851 - 12/11/20 11:48 PM (3 years, 1 month ago)

I think that may be referring to the airflow capacity at the initial resistance 1". You can use the Dayton 1TDU1 with option 1 and no prefilter and it would be about perfect I think. The spec sheet says 500cfm at .8" forthat blower.


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


Extras: Filter Print Post Top
OfflineGTEED
Stranger


Registered: 12/02/19
Posts: 99
Last seen: 2 years, 10 months
Re: Flowhood items. Advice so far. [Re: FungusFreedom]
    #27084903 - 12/12/20 12:43 AM (3 years, 1 month ago)

well what is confusing about the Damn filter 24x24x6 is if you look at the data sheet for the filters it says its .79w.g @ 175FPM. Does that make a difference at all about the static pressure of the filter? would the static pressure be the same if it was 150FPM for example? Would .79w.g just be the static pressure overall at any speeds?


Extras: Filter Print Post Top
OfflineFungusFreedom
Stranger
Male User Gallery


Registered: 08/21/20
Posts: 39
Loc: Midwest
Last seen: 1 year, 11 months
Re: Flowhood items. Advice so far. [Re: GTEED]
    #27084929 - 12/12/20 01:30 AM (3 years, 1 month ago)

I am guessing here, but I think that reads as we tested it at 175fpm and the resistance initially was .79.


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


Extras: Filter Print Post Top
Invisiblesandman420
Saint PP
Male


Registered: 06/17/04
Posts: 5,384
Trusted Cultivator
Re: Flowhood items. Advice so far. [Re: FungusFreedom] * 1
    #27085002 - 12/12/20 03:43 AM (3 years, 1 month ago)

The static pressure absolutely changes when the airflow changes. More cfm pumped into a filter will increase the resistance.

So 0.79" was the resistance at the test speed of 175 fpm (700 cfm through a 4 sq foot filter is 175 fpm flow rate)

At 100 fpm the resistance will be considerably lower, it is not linear but a close enough is good enough here.

So the "damn filter" is likely more something like 0.45" wg at 100 fpm.  With the prefilter you are looking at 0.65" wg total.

Look what the blower runs at that speed, get one that does about 400 cfm @ 0.65" wg


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Extras: Filter Print Post Top
OfflineGroo
sola dosis facit venenum
 User Gallery


Registered: 12/06/14
Posts: 2,310
Last seen: 21 days, 7 minutes
Re: Flowhood items. Advice so far. [Re: sandman420]
    #27085224 - 12/12/20 08:23 AM (3 years, 1 month ago)

Keep in mind he was looking at 2 filters 1 with res .9 and 1 .75


Please refer me to where you read about wg resistance i waa read what you are saying about.

got it but theres no math formula any


Edited by Groo (12/12/20 10:51 AM)


Extras: Filter Print Post Top
Invisiblesandman420
Saint PP
Male


Registered: 06/17/04
Posts: 5,384
Trusted Cultivator
Re: Flowhood items. Advice so far. [Re: Groo]
    #27085237 - 12/12/20 08:31 AM (3 years, 1 month ago)

wg same meaning as sp. Wg means inches water gauge also sometimes wc inches water column all same shit. the measurement of static pressure we are using.

Refer to what, that static pressure changes as airflow changes?

Well I can show you things like this



and this

https://www.mtlfab.com/media/SF4000_Resitance_Curve99.pdf

or you can use your mind and think about blowing in a straw. It's easy to blow a small amount of air through a straw lightly, but you can blow so hard that your cheeks hurt because you are trying to force more air than can fit at once increasing the static pressure, ie the "wg.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Edited by sandman420 (12/12/20 08:33 AM)


Extras: Filter Print Post Top
OfflineRoscoeReturnsS
Crotchety chode man
Male


Registered: 02/12/18
Posts: 1,738
Loc: State of Confusion
Last seen: 4 hours, 1 minute
Re: Flowhood items. Advice so far. [Re: Groo]
    #27085426 - 12/12/20 10:20 AM (3 years, 1 month ago)

But pressure changes with the square of airflow. Fan law. #2 can be used to approximate sp.

Using that “damn filter” example:

(cfm2/cfm1)^2 * SP1 = SP2

(400/750)^2 * 0.79 = SP2

(0.53)^2 * 0.79 = SP2

0.28 * 0.79 = SP2

0.22= SP2

Unfortunately even that won’t be quite right as the curve for an actual filter won’t follow those rules at very low, or very high airflow. The 100fpm we look for to achieve laminar flow, is actually a fairly low flow rate, so the actual sp is likely a bit higher than calculated. Filter manufacturers will typically publish airflow vs pressure curves similar to the one sandman posted for a particular type of filter. The listed static pressure on the filter label is the actual measured pressure for that individual filter as tested. They don’t test each filter at multiple air flows, but the pressure curves they publish are pretty close.


Extras: Filter Print Post Top
OfflineGTEED
Stranger


Registered: 12/02/19
Posts: 99
Last seen: 2 years, 10 months
Re: Flowhood items. Advice so far. [Re: RoscoeReturns]
    #27086030 - 12/12/20 04:21 PM (3 years, 1 month ago)

Ok, so I have decided to rule out the earthstongue filters because the static pressure is higher (.9 w.g) which means I will need a big 1/4hp blower the 1TDU2. Now going with the "damn filter" 24x24x6 based on the logic you brought up sandman420 - 400cfm @ .65 w.g I believe this to be better.

Using the "damn filter" 24x24x6 with .65 w.g I believe the two best choices for a blower would be the 1TDT7 or 1TDT8.
Here are the specs on these two.


From what I am seeing the 1TDT8 is a little high on the CFM's, but could I use a router speed controller to adjust to get laminar flow by using a lighter test and get 100cfm showing using an Anemometer?

Which one would you guys recommend? 1TDT7 or 1TDT8? or am all wrong and need some other blower? One I am not aware of for this 400cfm @ .65 w.g recommendation?


Extras: Filter Print Post Top
OfflineRoscoeReturnsS
Crotchety chode man
Male


Registered: 02/12/18
Posts: 1,738
Loc: State of Confusion
Last seen: 4 hours, 1 minute
Re: Flowhood items. Advice so far. [Re: GTEED]
    #27086043 - 12/12/20 04:29 PM (3 years, 1 month ago)

Not all blowers are suitable for use with a speed control. Make sure those are before assuming you can.


Extras: Filter Print Post Top
Invisiblesandman420
Saint PP
Male


Registered: 06/17/04
Posts: 5,384
Trusted Cultivator
Re: Flowhood items. Advice so far. [Re: RoscoeReturns]
    #27086081 - 12/12/20 04:49 PM (3 years, 1 month ago)

Just don't use a speed controller at all on a squirrel cage blower. It can work on some particular ones, and other for a while, but it can be a fire hazard I burned up a speed controller once! Totally let the smoke out. You can block part of the intake to control the airflow with strips of gorilla duct tape across the intake opening if it is not too much of a change you need.

Looks like you could go with the dt7 and not speed control it and be in laminar flow speed range.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Extras: Filter Print Post Top
OfflineGTEED
Stranger


Registered: 12/02/19
Posts: 99
Last seen: 2 years, 10 months
Re: Flowhood items. Advice so far. [Re: RoscoeReturns]
    #27086091 - 12/12/20 04:55 PM (3 years, 1 month ago)

That's helpful to know. Thank you.

Was looking to see if any DIY build plans were out there and found this website. http://www.sporetradingpost.com/flow_hood_equipment.htm

They are also selling filters up to 24x24x6 and it has a:

"All-Purpose Blower--549 CFM Free Air Delivery
115V/60Hz, 549 CFM free air delivery, 360 CFM at .8" static pressure."

that it states will work with any of their filters they are selling.
Does this seem correct? worth my time and money going this route? or should I just try out the "Damn filter" brand and try the 1TDT7?


Extras: Filter Print Post Top
Invisiblesandman420
Saint PP
Male


Registered: 06/17/04
Posts: 5,384
Trusted Cultivator
Re: Flowhood items. Advice so far. [Re: GTEED]
    #27086113 - 12/12/20 05:13 PM (3 years, 1 month ago)

I'm pretty sure that blower they are selling is just a 1tdt7 and they very slightly rounded the numbers to make it less obvious. Wherever the price is right I reckon.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Extras: Filter Print Post Top
OfflineEclipse3130
Servant of the Fungi
Male User Gallery


Registered: 10/06/13
Posts: 6,220
Loc: PNW
Last seen: 1 hour, 28 minutes
Re: Flowhood items. Advice so far. [Re: sandman420]
    #27086161 - 12/12/20 05:43 PM (3 years, 1 month ago)

Why not just buy a pre-made ready to go 2x4. They're only about $1000 shipped brand new, save time and money


--------------------
"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"


Extras: Filter Print Post Top
OnlineCocaineBuffet
Stranger
 User Gallery


Registered: 08/29/19
Posts: 3,456
Last seen: 1 minute, 57 seconds
Trusted Cultivator
Re: Flowhood items. Advice so far. [Re: Eclipse3130]
    #27086263 - 12/12/20 06:42 PM (3 years, 1 month ago)

Quote:

Eclipse3130 said:
Why not just buy a pre-made ready to go 2x4. They're only about $1000 shipped brand new, save time and money




:justno:


Extras: Filter Print Post Top
Jump to top Pages: 1 | 2 | Next >  [ show all ]

Shop: PhytoExtractum Maeng Da Thai Kratom Leaf Powder   Kraken Kratom Red Vein Kratom


Similar ThreadsPosterViewsRepliesLast post
* Flowhood box MushroomMarkk 1,436 7 05/28/05 03:49 PM
by MushroomMarkk
* What's the "Initial Resistance" and "Final Resistance" about laminar flowhoods? FreeSporePrints 4,393 7 10/26/06 01:14 PM
by FreeSporePrints
* Laminar Flowhood Q's Hobosapien 1,239 4 04/07/07 12:12 PM
by RogerRabbit
* Duct fan usable for Flowhood? eclipse 812 1 10/03/06 08:13 AM
by RogerRabbit
* Good prices on blowers for flowhood(need input though,might be too powerful eclipse 1,516 7 10/06/06 08:58 PM
by eclipse
* Construction of a flowhood Jpilot 1,711 5 08/13/05 09:31 AM
by Jpilot
* Smalles ratio or just smallest possible flowhood Schwip 846 6 05/30/06 10:54 AM
by Prisoner#1
* Flowhood vs glovebox plus parts question MadHatR 4,042 15 10/27/04 03:22 AM
by MadHatR

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: Shroomism, george castanza, RogerRabbit, veggie, mushboy, fahtster, LogicaL Chaos, 13shrooms, Stipe-n Cap, Pastywhyte, bodhisatta, Tormato, Land Trout, A.k.a
893 topic views. 33 members, 189 guests and 37 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Copyright 1997-2024 Mind Media. Some rights reserved.

Generated in 0.024 seconds spending 0.007 seconds on 16 queries.