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c10h12n2o
serial dilutor



Registered: 01/21/15
Posts: 3,200
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Flow Hood Design Questions (UPDATE: Completed Pics)
#24137384 - 03/04/17 10:06 PM (7 years, 3 months ago) |
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UPDATE: Finally Finished!! Turned out great!!go to page 6for pics
hello lovely people, i hope all is well 
sorry i have been MIA for a few months, been super busy, and recently relocated. i was going through more than 500 plates a week before i tore down my glove box at my old location hahaha..... once i get caught up i have lots of cool pics and notes to share, been working on lots of cool stuff
here is what my SAB looked like before i tore it down, built in a closet with hinged lid and raised rack over damp towels, and a tablet streaming documentaries from my plex server 
 
for this flow hood build, i already have a 24x24 filter from FP, and 2 different blowers, 1/4 hp and 1/2 hp
here are some of the designs i have been looking at. I have been debating constructing a cabinet with a shielded, enclosed workspace similar to the commercial designs, with lights built in.
or, alternatively, I might just go with the simple design most people use (and possibly add a removable plexi/glass shield for the workspace), since it would be more portable and my wide shoulders would not be restricted by the 24" workspace, and i could put a lamp and other gear to the side.

Any input on the designs is much appreciated, this is the first hood ive built, and id love to hear you guys' thoughts about the different designs, and what you'd recommend.
my main hang up is the blower. I got both second hand and can find zero info about the cfm and SP curve for either blower. both are 4 speed, 115v. i suspect the 1/4hp 9.5 amp might be too weak for 400cfm @ 1.2" , and the 1/2 hp 7.1 amp might be too strong (the guy said it was at least 1000 cfm at the lowest speed). here are pics of all the markings.
  
i think pirateswaezy used a 1/2hp for his 24x24, and he said he was unable to restrict the intake enough to get the right airflow, and ended up getting a harbor freight router speed controller to dial it in. what do yall think will be my best course of action in this regard?
any input/feedback/advice is much appreciated and will be put to good use! thanks in advance my friends
Edited by c10h12n2o (03/21/17 04:16 PM)
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TheMadHatter420
Trusted Farmer


Registered: 10/12/16
Posts: 12,942
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Re: Flow Hood Design Questions [Re: c10h12n2o]
#24137556 - 03/05/17 12:34 AM (7 years, 3 months ago) |
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If both are 4 speed then you really have 8 settings to choose from. I to just got a 24 x 24 filter and picked up a big 4 speed today. For like $21 I ordered a meter off ebay that will measure in CFM. Can check fan at all speed both solo and with my filter. I also am stuck as to if I should build with a shield.
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c10h12n2o
serial dilutor



Registered: 01/21/15
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right, since youre working on a similar project here are some more designs ive been lookin at for inspiration, might be helpful for your design

I also ordered a similar meter, for measuring ft/m , cfm, etc, should be here monday. should be helpful for dialing in the flow, and possibly for verifying blower output. sounds like we have been on the same train of thought haha...
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  C10's Agar Guide + Tips and Tricks | c10's Flow Hood Build Guide "Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing." "Convictions are more dangerous enemies of truth than lies" ― Friedrich Nietzsche
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TheMadHatter420
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Re: Flow Hood Design Questions [Re: c10h12n2o]
#24137611 - 03/05/17 01:24 AM (7 years, 3 months ago) |
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I bet the 1/2 on slow will be about right. From looking at blowers online, it seems to take one with around 800 CFM free flow to get you to 400 CFM total coming out the front of the filter.
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c10h12n2o
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Registered: 01/21/15
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it really depends on a few things i dont totally understand yet (hence appealing to the community), such as the blower wheel width and radius, rpm, and probably some other things i havent figured out yet.
ive seen some curves that have well over 1000cfm @ 0.0" but cavitate under any kind of pressure at all, totally useless for our purposes, and others that are almost flat across their peak... every time i think i start to figure this blower stuff out i find whole new layers of ignorance to deal with lol....
is it odd that the 1/4 hp has higher amps draw than the 1/2 hp (9.5 vs 7.1)?
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  C10's Agar Guide + Tips and Tricks | c10's Flow Hood Build Guide "Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing." "Convictions are more dangerous enemies of truth than lies" ― Friedrich Nietzsche
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mushpunx
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Re: Flow Hood Design Questions [Re: c10h12n2o]
#24137874 - 03/05/17 06:18 AM (7 years, 3 months ago) |
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https://www.shroomery.org/forums/showflat.php/Number/21243400#21243400
Here is my build log.
Not all blowers are created equal, you need the specs. Look for the model number and contact the manufacturer and ask for them.
I would just build it like mine, either with the pre filter housing around the blower or just attaching the pre filter to the blower intake like RR does.
How deep is your filter? That will also affect what blower you need because of the different resistance of deeper filters.
Also it will determine the size plenum you need behind the filter. For a 6" deep one , it needs a 6" deep plenum, 12" for 12" et
Mine is a 6" deep filter but I built a 10" plenum, I recomebd going a little deeper than the minimum
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AndyHinton


Registered: 12/05/16
Posts: 434
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Re: Flow Hood Design Questions [Re: c10h12n2o]
#24138045 - 03/05/17 08:12 AM (7 years, 3 months ago) |
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Hi, I went through 3-4 flow hood designs before I decided to perfect the basic one. The reasons were space, cost, and complexity. My small 2 ft × 1 ft filter will fit in a 40" × 20" × 20" box and weigh about 200 lbs.
The luxuries that matter to me are power control, soundproofing, internal filters, and solid construction. So the fan will be mounted to the side on a double layer of plywood, in a soundproofed box; the plenum will have two MERV 8 filters before the HEPA filter; there will be a control panel with variac, ammeter, power switch, and fuse; and the case will use glued dovetail joints.
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Edited by AndyHinton (03/14/17 12:43 PM)
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CapnZ
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Re: Flow Hood Design Questions [Re: AndyHinton]
#24138062 - 03/05/17 08:22 AM (7 years, 3 months ago) |
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I worked on design variations for a couple weeks before I landed on this. Pretty easy to build, lots of right angles. True flow hood work area. I used a 549 Cfm blower. Dayton 1TDT2 blower. Works great.
-------------------- Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...
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Pipefitter537
You're Not Yelping



Registered: 11/25/16
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Re: Flow Hood Design Questions [Re: CapnZ]
#24138249 - 03/05/17 10:10 AM (7 years, 3 months ago) |
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If you need any info on fans/blower mothers, contact any heating/ac supply fan place. Most good supply houses have an individual who deals with just fan related stuffs. Also call up some motor re-building shops too
-------------------- "You should never underestimate the predictability of stupidity"-Bullet Tooth Tony
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c10h12n2o
serial dilutor



Registered: 01/21/15
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slick build capnz!
re mushpunx: thanks buddy. i had actually figured that much out (mainly from memorizing your badass thread, along with every other build thread on the site. my filter is the standard FP 24x24x5.8. I know i need the blower specs, thats exactly what i am struggling with, if i could find that id be golden. I havent been able to find ANY info on the blowers, at all... and my google-fu is not weak lol.... literally cant find anything on the blower, only the motor. I have figured out that the 1/4 hp was used in a Rheem model:ROUZ oil furnace, as pictured on this page http://www.searspartsdirect.com/model-number/rouz/1299/0912150.html, but cannot find any blower specs..... its driving me crazy
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  C10's Agar Guide + Tips and Tricks | c10's Flow Hood Build Guide "Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing." "Convictions are more dangerous enemies of truth than lies" ― Friedrich Nietzsche
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mushpunx
Fungus Punk


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Re: Flow Hood Design Questions [Re: CapnZ]
#24138643 - 03/05/17 12:40 PM (7 years, 3 months ago) |
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Quote:
CapnZ said: I worked on design variations for a couple weeks before I landed on this. Pretty easy to build, lots of right angles. True flow hood work area. I used a 549 Cfm blower. Dayton 1TDT2 blower. Works great.

Is that 18 x 24? If it is then I use the same blower + filter!
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CapnZ
Dimensional explorer



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Re: Flow Hood Design Questions [Re: c10h12n2o]
#24138722 - 03/05/17 01:18 PM (7 years, 3 months ago) |
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Quote:
c10h12n2o said: slick build capnz!
re mushpunx: thanks buddy. i had actually figured that much out (mainly from memorizing your badass thread, along with every other build thread on the site. my filter is the standard FP 24x24x5.8. I know i need the blower specs, thats exactly what i am struggling with, if i could find that id be golden. I havent been able to find ANY info on the blowers, at all... and my google-fu is not weak lol.... literally cant find anything on the blower, only the motor. I have figured out that the 1/4 hp was used in a Rheem model:ROUZ oil furnace, as pictured on this page http://www.searspartsdirect.com/model-number/rouz/1299/0912150.html, but cannot find any blower specs..... its driving me crazy
Thanks man!
-------------------- Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...
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CapnZ
Dimensional explorer



Registered: 12/22/16
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Re: Flow Hood Design Questions [Re: mushpunx]
#24138749 - 03/05/17 01:30 PM (7 years, 3 months ago) |
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Quote:
mushpunx said:
Quote:
CapnZ said: I worked on design variations for a couple weeks before I landed on this. Pretty easy to build, lots of right angles. True flow hood work area. I used a 549 Cfm blower. Dayton 1TDT2 blower. Works great.

Is that 18 x 24? If it is then I use the same blower + filter!
Hey my filter is actually 16 x 19. I use a pretty sturdy allergen prefilter which backs my cfm in to the plenum down to below 500. Still I'm probably a bit overpowered with this blower but I'm pretty sure the next one down would have been not enough. I get a good strong laminar flow across the entire filter face. Have not purchased a velocity meter so do jot know exactly but very happy with the results.
-------------------- Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...
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mushpunx
Fungus Punk


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Re: Flow Hood Design Questions [Re: CapnZ]
#24138914 - 03/05/17 02:34 PM (7 years, 3 months ago) |
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Oh yea I'm sorry I think I already asked you about your hood before haha
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CapnZ
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Re: Flow Hood Design Questions [Re: mushpunx]
#24139157 - 03/05/17 04:02 PM (7 years, 3 months ago) |
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No worries man!
-------------------- Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...
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maddchef
Vaginal escape artist



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Re: Flow Hood Design Questions [Re: CapnZ]
#24140265 - 03/06/17 01:54 AM (7 years, 3 months ago) |
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Just from experience I would have a "ceiling and walls" on my hood. Maybe just do hinged plexisgall but I have more problems that most so I'd opt for every safety measure I can.
If you have a 24x24 I would call your "safe work area to be more like 20×20
-------------------- In the land of the blind, the one eyed man is king. All mushrooms are edible, but some only once..... Easier than cakes I do science and shit.
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CapnZ
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Re: Flow Hood Design Questions [Re: maddchef]
#24140456 - 03/06/17 06:39 AM (7 years, 3 months ago) |
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Quote:
maddchef said: Just from experience I would have a "ceiling and walls" on my hood. Maybe just do hinged plexisgall but I have more problems that most so I'd opt for every safety measure I can.
If you have a 24x24 I would call your "safe work area to be more like 20×20
 Without ceiling and walls it's not a hood. It's a cabinet.
-------------------- Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...
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mushpunx
Fungus Punk


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Re: Flow Hood Design Questions [Re: CapnZ]
#24140559 - 03/06/17 08:00 AM (7 years, 3 months ago) |
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Yea but we all call em flow hoods
I've thought about adding a hood to mine before.
I still might. Im not gunna attach though, I'll just make one of clear plexiglass I can just set over the cabinet I wonder if it'll limit my arm motions tho since mine is only 18 x 24"
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maddchef
Vaginal escape artist



Registered: 09/04/09
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Re: Flow Hood Design Questions [Re: mushpunx]
#24140975 - 03/06/17 11:25 AM (7 years, 3 months ago) |
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I'm just saying hood and walls so youre not creating eddys and you effectively create a sterile tunnel that no outside air even has a chance to mix with.
Try holding a plate at the very edge of your filter and you will see what I mean. You'll think you have a hole in your hood.
-------------------- In the land of the blind, the one eyed man is king. All mushrooms are edible, but some only once..... Easier than cakes I do science and shit.
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tombosley8
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Re: Flow Hood Design Questions [Re: maddchef]
#24141052 - 03/06/17 11:57 AM (7 years, 3 months ago) |
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So wait, am I getting this right?
Is it better to use plexi glass(or similar) shields for my flowhood or no shields at all?
I understand it will reduce maneuverability but are there any other downfalls to this?
Could it create more turbulence or expose your work to more contams from bumping the sides?
I would like to have access to the table space on the sides the laminar flow without the shields in the way so I imagined making only 8" shields so they don't protrude too far.
Will these short 8" shields help? And if I were to make the top shield longer than the sides, say 12", would there be any problems with that?
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