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PhytoExtractum Shop: Maeng Da Thai Kratom Leaf Powder

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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: Mycolorado]
    #23577225 - 08/25/16 06:44 PM (7 years, 5 months ago)

apparently its brand new, but surplus....


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OfflineQuadman
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23577322 - 08/25/16 07:07 PM (7 years, 5 months ago)

They are usually dated and once expired they remove from inventory, even though they are brand new and still in original packaging.


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: Quadman]
    #23578496 - 08/26/16 03:42 AM (7 years, 5 months ago)

I totally bought one ahaha


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InvisibleMycolorado
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23578932 - 08/26/16 08:23 AM (7 years, 5 months ago)

Quote:

anthiawe said:
I totally bought one ahaha



Awesome!  :thumbup:


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OfflineQuadman
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Re: looking at this flowhood - no knowledge of flow hoods [Re: Mycolorado]
    #23579149 - 08/26/16 09:44 AM (7 years, 5 months ago)

Cool your on your way to a build! It is big but enough to handle any task.


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: Quadman]
    #23579391 - 08/26/16 10:49 AM (7 years, 5 months ago)

Any idea the blower specs I need.....me and math are enemies


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OfflineQuadman
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23579504 - 08/26/16 11:16 AM (7 years, 5 months ago)

Ant.. blower calc. I believe this the same size as mine. Filter measures 38" x 15" = 570"
570" ÷ 144"= 3.96 sq ft
Stamets recommends 100 cu feet per minute per square foot for laminar flow
So rounding off you need 400 feet per minute.
Now when you get your filter the label show what static pressure is required.
For example mine has static pressure of .4 " and if you use a prefilter (regular cheap furnace filter) you will add approximately .12 " so total pressure .52"
So I needed a fan that could move at least 400 cu feet at .52" pressure
You can run more I think I've read up to 150 feet and still maintain laminar flow a little more is good to allow for filter clogging . You can always cut back with speed controller or choke off intake.


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: Quadman]
    #23582525 - 08/27/16 05:10 AM (7 years, 5 months ago)

the one coming is 17hX41W so 697"

why did you divide by 144"?


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23582540 - 08/27/16 05:22 AM (7 years, 5 months ago)

I think i need 500cu feet per minute. and once i see the static pressure required on the filter i can figure out the exact blower specs i need.

your .4 and .12 for filters =.52 how did you calculate that?


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OfflineQuadman
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23582579 - 08/27/16 06:09 AM (7 years, 5 months ago)

Quote:

anthiawe said:
the one coming is 17hX41W so 697"

Your filter has an extruded aluminum frame it's not all filter

why did you divide by 144"?




There are 144 square inches in 1 square foot 12"x 12" = 144


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OfflineQuadman
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23582584 - 08/27/16 06:17 AM (7 years, 5 months ago)

Quote:

anthiawe said:[/

your .4 and .12 for filters =.52 how did you calculate that?




I used my filter as an example, as I said  once you get your filter the static pressure should be on its label. You will use that number to calculate fan size

.12" is what I've read as kind of the standard for a prefilter (cheap furnace filter)
Of course you can use a heavier prefilter , but it will be more pressure to pull air through it


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: Quadman]
    #23586454 - 08/28/16 10:38 AM (7 years, 5 months ago)

ok! i think i'm getting it.....but ya know what we arts degree students are like when we get around number....

thanks for your help quadman


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OfflineQuadman
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23587070 - 08/28/16 02:10 PM (7 years, 5 months ago)

Your welcome, it's not rocket science and your probably close with 500 feet. I do know your filter is thicker than mine ,so it will probably take more pressure. My pleasure.


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: Quadman]
    #23626174 - 09/08/16 03:22 PM (7 years, 4 months ago)

i received the filter in the mail today...its real big. hopefully get the blower this weekend, but will check back with my math and what not to see if i'm correct


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23626261 - 09/08/16 03:48 PM (7 years, 4 months ago)

its says on the top of the filter

365 - cfm
0.002 - %PEN
.30 W.G

soooo is this just meaning  i need a 365 cfm blower?


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Offlineshroombasa
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23626356 - 09/08/16 04:17 PM (7 years, 4 months ago)

The 365 CFM is the test flow at .3" static pressure.

Your filter is 5 sq ft.  You want 100 feet per minute of flow from each square foot of filter area, for a total of 500 CFM.  That's the bare minimum.  Increase this number by 20-50% to account for losses and inefficiencies.  That's 600-750 CFM.

Your filter has a pressure rating as well as a flow rating.  The test flow on the filter, 365 CFM @ .3", is roughly half the airflow you will be pumping through it, so because airflow and pressure are typically proportional in these filters, double the airflow, double the static pressure.  So your filter will experience .6" of static pressure.

You'll want to add a prefilter to increase the longevity of your flow hood.  These are typically .1".  Your total static pressure from both filters is going to be .7" 

IMO, you'd need a blower in the ballpark of 700 CFM @ .7".


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Offlineanthiawe
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Re: looking at this flowhood - no knowledge of flow hoods [Re: shroombasa]
    #23626363 - 09/08/16 04:19 PM (7 years, 4 months ago)

whoa, thanks shroombasa,

what does the W.G stand for to become static pressure?


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Offlineshroombasa
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Re: looking at this flowhood - no knowledge of flow hoods [Re: anthiawe]
    #23626396 - 09/08/16 04:36 PM (7 years, 4 months ago)

My pleasure.

It stands for 'water gauge'.  I think it's based off of how they used to measure barometric pressure, so inches w.g. is just a unit.


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Offlineisko

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Re: looking at this flowhood - no knowledge of flow hoods [Re: shroombasa]
    #23626960 - 09/08/16 07:27 PM (7 years, 4 months ago)

water gauge =water column
1" water gauge =1/28 psi, since 1psi is 28" water gauge.


Edited by isko (09/08/16 11:37 PM)


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InvisibleMycolorado
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Re: looking at this flowhood - no knowledge of flow hoods [Re: isko]
    #23648839 - 09/15/16 09:21 PM (7 years, 4 months ago)

Replaced the old, fried 1/5hp motor with a new 1/3hp motor. No clue what it pushes...prolly a formula based on cage dimensions, rpms, etc., but should be sufficient for a larger filter...looking for a 2'x3'.  Anyway, $20 for the fan, $10 on paint and $50 for the new motor.  Runs like a champ!  Gonna look cool sittin on top of the box as well.  Here are the before and after:


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Helpful Threads
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Mycolorado’s Tamp Fruit Project
Tampanensis Grow with Mycolorado
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Edited by Mycolorado (09/15/16 09:29 PM)


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PhytoExtractum Shop: Maeng Da Thai Kratom Leaf Powder


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