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vikingsc
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Re: who wants a flowhood? [Re: vikingsc]
#19438259 - 01/18/14 02:57 PM (10 years, 1 month ago) |
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So it looks like you'd be a 150 - 160 CFM.
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vikingsc
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Re: who wants a flowhood? [Re: vikingsc]
#19438292 - 01/18/14 03:03 PM (10 years, 1 month ago) |
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The hepa creates .9 inches of static pressure at 1000 CFM.
The blower list only goes up to .8 inches of static pressure. But the CFM decline is progressively going up. A 60 CFM decline from .7 to .8 so I would assume that it would be another 65 -75 CFM decline to .9 inches of static pressure. Making it around 140 - 150 CFM.
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Yuri.Pono
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Re: who wants a flowhood? [Re: vikingsc]
#19438302 - 01/18/14 03:05 PM (10 years, 1 month ago) |
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want my end finish to look like this just gonna cab mine in.
  
just found good info here hope i can figure this out http://www.shroomery.org/forums/showflat.php/Number/5569636/fpart/all/vc/1
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vikingsc
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19438331 - 01/18/14 03:11 PM (10 years, 1 month ago) |
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It wouldn't hurt to put some little side rails along the side of the table. Keeping all the air on it from around the hepa.
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Yuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19438333 - 01/18/14 03:11 PM (10 years, 1 month ago) |
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thanks for help. so i guess that is right on the 450-600cfm @ 1.1"
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vikingsc
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19438356 - 01/18/14 03:18 PM (10 years, 1 month ago) |
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I guess that's what you meant when said you were cab yours in.
I'm not sure what the minimums are, but your hepa provides .9 inches of static pressure. So if you work that out from the table they provide with the blower your finished flowhood will end up 140 - 150 CFM. Maybe RR or somebody would chime in if 140 - 150 cfm will be enough. I would think it'll still work ok, especially if you make it a bit of cabinet to work in.
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Yuri.Pono
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Re: who wants a flowhood? [Re: vikingsc]
#19438382 - 01/18/14 03:24 PM (10 years, 1 month ago) |
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ya more like a walk-in small closet.
thanks a bunch friend. glad i got someone to kinda steer me right and feel bad about the whole dude done his wrong if it's right was just listening to someone else that was saying it might not work for low sp
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Edited by Yuri.Pono (01/18/14 03:26 PM)
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vikingsc
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19438390 - 01/18/14 03:26 PM (10 years, 1 month ago) |
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Ohhh. I'd just semi close in a small work area |_|
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Yuri.Pono
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Re: who wants a flowhood? [Re: vikingsc]
#19438395 - 01/18/14 03:27 PM (10 years, 1 month ago) |
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good point
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Yuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19438439 - 01/18/14 03:40 PM (10 years, 1 month ago) |
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this is what i got from him on the email dont know if it matters
Quote:
HEPA Efficiencies - 99.97% and 99.99% minimum efficiency on 0.3 micrometer particles. ULPA Efficiency - 99.999% minimum efficiency of 0.3 micrometer particles and 99.9995% on 0.1 to 0.2 micrometer particles (11 1/2" deep only)."
think i was telling you right just making sure
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vikingsc
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19438464 - 01/18/14 03:46 PM (10 years, 1 month ago) |
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Quote:
Yuri.Pono said: this is what i got from him on the email dont know if it matters
Quote:
HEPA Efficiencies - 99.97% and 99.99% minimum efficiency on 0.3 micrometer particles. ULPA Efficiency - 99.999% minimum efficiency of 0.3 micrometer particles and 99.9995% on 0.1 to 0.2 micrometer particles (11 1/2" deep only)."
think i was telling you right just making sure
Ya that's not really the info you need. That's just the efficiency of the Hepa. Which is extremely efficient at filtering. Which also makes it difficult for airflow through it.
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Yuri.Pono
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Re: who wants a flowhood? [Re: vikingsc]
#19439814 - 01/18/14 09:16 PM (10 years, 1 month ago) |
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from here so im going to try to figure this out http://www.shroomery.org/forums/showflat.php/Number/5569636/fpart/all/vc/1
Quote:
ohmatic said:
Quote:
Brainiac said:
Quote:
1. Find out the area of your filter by multiplying the width and the hight in feet (for instance the smallest reasonably usable filter would be 2ft x 1ft)
2ft x 1ft = 2 ft2
2. Multiply the required air speed(the one Stamets specifies, 100 ft/min) with the area of your filter
100 ft/min x 2 ft2 = 200 ft3/min
So 200 ft3/min(= cfm = "cubic feet per minute") is the amount of air your blower must deliver at the sum of the STATIC PRESSURE of the HEPA filter + prefilter.
NOTE: 1 cfm= 1.7m3/h
So if you use the above filter with 1"(250Pa) static pressure and a furnace prefilter with a static pressure of 0.2"(50Pa) your blower must deliver 200 cfm(340m3/h) of air at a static pressure of 1.2"(300Pa).
Finding the correct blower Every blower should have a data sheet with a characterisitc curve that shows the air output in dependance of the static pressure. Every blower has a data sheet (consult the manufacturer if this is not the case with your blower) where the correlation between the flow and the static pressure is represented by a graph or table.
Here is such a set of curves for 4 blowers(numbered 1-4). NOTE: Each model of a blower has his own characteristical curve. This chart shows the curvers for 4 different particular models of axial duct blowers. What you can clearly see is that the bigger the static pressure the less air the blower delivers, up to the maximum static pressure where the air output is zero.
Edited by Yuri.Pono (01/18/14 09:44 PM)
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vikingsc
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19439853 - 01/18/14 09:29 PM (10 years, 1 month ago) |
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So since yours is 2' x 2' it sounds like stamets is saying that you would need 400 CFM at your filter's .9" Static Pressure. I guess that's the answer you didn't want. Sounds like the 140 - 150 CFM won't be enough.
You ordered your blower online? Maybe it hasn't shipped yet. Maybe you could get a hold of them and get a larger one sent instead?
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Yuri.Pono
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Re: who wants a flowhood? [Re: vikingsc]
#19439897 - 01/18/14 09:41 PM (10 years, 1 month ago) |
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it already at my hub hope they let me return
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Yuri.Pono
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19439909 - 01/18/14 09:44 PM (10 years, 1 month ago) |
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this is the math i figured up not understanding it one bit
so my filter is 24 x 24 x12
2ft * 2ft = 4 ft2
100 ft/min * 4 ft2 = 400 ft3/min
400 ft3/min * 1.7m3/h = 680 m3/h <<<don't understand what this means?
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Edited by Yuri.Pono (01/18/14 09:48 PM)
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vikingsc
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19439916 - 01/18/14 09:46 PM (10 years, 1 month ago) |
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Quote:
Yuri.Pono said: it already at my hub hope they let me return
I'm sure they will. Especially if your getting a larger one instead.
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vikingsc
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19439946 - 01/18/14 09:53 PM (10 years, 1 month ago) |
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Quote:
Yuri.Pono said: this is the math i figured up not understanding it one bit
so my filter is 24 x 24 x12
2ft * 2ft = 4 ft2
100 ft/min * 4 ft2 = 400 ft3/min
400 ft3/min * 1.7m3/h = 680 m3/h
Ya. You don't have to bother converting to m3/m and m3/h
The important part is the line: 100 ft/min * 4 ft2 = 400 ft3/min
Just make sure the blower you get does at least 400 CFM at .9" SP And if you decide to also add a regular 24" x 24" furnace filter in front of the hepa (just to protect and prolong the use of the filter) than you would want one that does the 400 CFM at 1.1" of Static Pressure.
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dirt dweller
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19440248 - 01/18/14 11:07 PM (10 years, 1 month ago) |
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I have been HVAC for along time now, and have used my talents for this hobby. I built a small flow hood similar to what you are try to achieve. If you drop by your local heating and cooling repair shop you should be able to get a 1-2 ton blower motor, housing and squril cage for a case of beer. Adjust the speed taps to the lowest speed and see how the flow is through the filter at 7-9" away from the face of the filter. A lighter should either not stay lit or see signs of flame lifting. I built my hood for about 50.00 not including the filter price. Hopes this helps if you have any questions hit me back. Dirt out...............
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SpiralHaze
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Re: who wants a flowhood? [Re: Yuri.Pono]
#19440271 - 01/18/14 11:15 PM (10 years, 1 month ago) |
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"So you need 400 cfm at whatever resistance you have. What resistance do you have? I'll tell you You filter is rated at 0.9"W.G@ 1000cfm. Well, if you pushed 1000 cfm through it, it would be blowing 250 fpm (1000 cfm / 4ft2=250 fpm) to find your actual working resistance, you need to find the relationship between 1000 cfm (what they tested at) and 400 cfm (what you will be using. 1000/400. 10/4. 5/2. That is the ratio of test resistance to use resistance. So; .9/1000 = x/400 .9 devided by 5 times 2 =.36 .9/1000=0.36/400 So what I am saying here is @ 100 fpm (400cfm) the resistance of this filter is 0.36" W.G add 0.2 for a prefilter and your total initial resistance is 0.56" W.G.g add your 20% (for clogging of the filter) and you are at 0.67" W.G. you are looking for a blower that produces 400 cfm@ .7" W.G. If any of this is confusing, tell me and I'll try to make it more clear"
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SpiralHaze
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Re: who wants a flowhood? [Re: SpiralHaze]
#19440282 - 01/18/14 11:18 PM (10 years, 1 month ago) |
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