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camplo
Freedom!


Registered: 02/10/08
Posts: 1,675
Last seen: 3 years, 3 months
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Flow Hood help
#21327636 - 02/25/15 11:38 AM (9 years, 10 months ago) |
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 Here she is un-assembled. The frame was meant to catch the gasket on the front of the filter as well as sandwich the filter and prefilter between itself and the four mounting braces.
 The filter is one of 2 broken filters I received from the company ordered from. A 3rd (yes third) RMA filter will be here soon (lol if its damaged too). I may actually use the 2nd broken filter it only has a few small tears in 2 corners.
 This bitch is f'n awkward (25x25x30). I have no idea where to put it...and its a pain to move around. The fan is a 1/2 hp furnace fan I scooped off of craigslist.
 Finally the test. As you can see in the previous pic the frame isn't even fully attached, which is letting a good amount of air out, the filter has several large rips in it, the fan is just sitting in the hole, not sealed, yet its not leaking much air as its a pretty tight fit I guess...but my point is that even with all the pressure loss, from several inches away (about a ft actually) the flow was high enough to bend the flame of my butane torch (I didn't have a lighter handy).
Cost? 40 dollars worth of 3/4inch particle board 9 dollars worth of screws and nails 123 for the 24x24x6 99.999 hepa 46 for the electrostatic washable prefilter 40 bucks for the furnace fan (craigslist)
Any advice? Any questions? I have no idea how far away I can actually be from the filter face for effective laminar flow, so if someone could advise on that i'd appreciate it.
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Edited by camplo (02/25/15 11:58 AM)
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camplo
Freedom!


Registered: 02/10/08
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Re: Flow Hood help [Re: camplo]
#21327661 - 02/25/15 11:47 AM (9 years, 10 months ago) |
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lol I just tried the lighter test. I can't even keep it lit at 2ft away so I think I have plenty of flow! Good think there are speed settings on this thing!
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Val
Were just Marbles in a Cave...

Registered: 01/31/15
Posts: 120
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Re: Flow Hood help [Re: camplo]
#21329380 - 02/25/15 05:13 PM (9 years, 10 months ago) |
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I know when I built mine i used Silicone to seal all crevices....also there was a airflow spec that I followed to size my fan.
I also Built a pre filter box to go over fan with a good filter found at big box home stores.
Edited by Val (02/25/15 05:16 PM)
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camplo
Freedom!


Registered: 02/10/08
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Re: Flow Hood help [Re: Val]
#21337111 - 02/27/15 07:49 AM (9 years, 10 months ago) |
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I'd like to have a prefilter before the fan but the box is gigantic as it is. When I was a little more well studied on the subject (while gathering parts) I came to the conclusion that this fan would be adequate. I did not expect it to be over kill, but it does have 4 different speeds to so no worries there. If I'm correct my final airflow should be about 200 cfm, and will lean a light flame approx 45 degrees....from what distance I don't know. I also don't know the size of the effective work area and was hoping someone would clue me in.
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mushpunx
Fungus Punk



Registered: 04/20/14
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Re: Flow Hood help [Re: camplo]
#21337349 - 02/27/15 09:14 AM (9 years, 10 months ago) |
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I try to work as close to the filter as possible as thats the cleanest. When pouring plates, Agar work, grain to grain have everything right up against the filter (doesnt have to touch it obviously.)
I mean you really dont want to have anything betweem your work and the hepa anyways. I dont actually know how far away you can work with it. I work within six inches of the filter 
Nice build man! Nice prices on everything too looks like you got a deal!
So you matched the filter to the blower yea? What was the specs on the blower @ free air and then at like .8 or 1sp
If you matched them up correctly it should be solid.
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Mr. Alien
I will abduct andprobe your anus



Registered: 01/14/14
Posts: 6,290
Loc: Star Wars Galaxy
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Re: Flow Hood help [Re: mushpunx]
#21337414 - 02/27/15 09:28 AM (9 years, 10 months ago) |
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Add a plexi glass tunnel. It will give you a much cleaner space to work.
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mushpunx
Fungus Punk



Registered: 04/20/14
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Love your work space mr alien !
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Mr. Alien
I will abduct andprobe your anus



Registered: 01/14/14
Posts: 6,290
Loc: Star Wars Galaxy
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Re: Flow Hood help [Re: mushpunx]
#21338087 - 02/27/15 12:06 PM (9 years, 10 months ago) |
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Thank you! Hope it give some ideas to others.
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camplo
Freedom!


Registered: 02/10/08
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Thanks for the info guys.
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camplo
Freedom!


Registered: 02/10/08
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Re: Flow Hood help [Re: camplo]
#21352049 - 03/02/15 01:27 PM (9 years, 10 months ago) |
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To any new flow hood builders, you can test your work space for laminar flow with a lighter are better yet a butane torch. Take the lighter/torch and move it around in front of the flowhood while its in operation, the flame will bend but not twitch wildly when in the flow thats laminar. When its in a turbulent flow it will show the character of the turbulence by the effect on the flame. One of the reasons I opted to build with a 24x24 filter is because I suspected that flow around the edges of the filter would be turbulent no matter what because of the lip of the cage of the filter catching air. Tested with my torch, my theory is correct. Within the 24x24 area if have an area of about 17x17 that has perfectly laminar flow.
If I remember correctly most people will advise to work as close as possible to the filter as well, in the middle of the filter. Gl.
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Mr. Alien
I will abduct andprobe your anus



Registered: 01/14/14
Posts: 6,290
Loc: Star Wars Galaxy
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Re: Flow Hood help [Re: camplo]
#21352065 - 03/02/15 01:32 PM (9 years, 10 months ago) |
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The flame should bend 45º with a BIC lighter. A butane torch is not the same IMO, the flame goes out much stronger with a torch.
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camplo
Freedom!


Registered: 02/10/08
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That is if you are care to have a 200cfm or below. You can still get laminar flow above 200cfm
But A butane torch flame can have a stronger than a lighter for sure. Thus it won't get blown out as soon as a lighter would in terms of CFM, non the less it can still be used to test for laminar flow.
As well you must consider that you can adjust the flow of a butane torch to be weaker than a bic lighter if you chose too.
Quote:
Matching a blower to the filter According to Stamets (Paul Stamets and J.S.Chilton: The Mushroom Cultivator p. 347 ff) the air speed of the air flowing from the filter surface should be (at least) 100 feet per minute(fpm).(around 30 meter per minute or 0.5 meter per second).
I believe its 200cfm that gets you there and the bic lighter test will show a 45 degree angle but you can go over that airspeed. It would be silly to have airspeed so high that you can't keep your flame source lit I must say. If you get too high I believe that will not have laminar flow as well as if you have too little, either way the flame will tell you how the air is behaving. I am not certain how high is too high but I don't think anyone of us can provide enough power to hit that number anyway...
If you notice in the pic above the flame is bent, it is not dancing about wildly or at all for the matter, which would signify turbulence...it is in laminar flow.
Edited by camplo (03/02/15 06:14 PM)
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mushpunx
Fungus Punk



Registered: 04/20/14
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Re: Flow Hood help [Re: camplo]
#21353172 - 03/02/15 06:31 PM (9 years, 10 months ago) |
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Hey man you see the bent pins you have in the filter? You can take a thin nail and just pull up with it and it rounds them back out
I bump mine all the time I straighten them out
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camplo
Freedom!


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Re: Flow Hood help [Re: mushpunx]
#21353320 - 03/02/15 07:00 PM (9 years, 10 months ago) |
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That filter has holes in it, it was destroyed in shipping, so was the 1st RMA, and the the 2nd RMA, finally, came in mint condition.
Its weird to me that the 2nd filter they sent was of better construction/build than the first, and the 3rd filter they sent was of way better construction than the first 2. The 3rd filter looks like its mini pleated. I'll post a pic when I get home.
Thanks for the advice though, my filter (the 1st and 2nd rma) has a metal grate on the front to supposedly stop that from happening
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Edited by camplo (03/02/15 07:02 PM)
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Mr. Alien
I will abduct andprobe your anus



Registered: 01/14/14
Posts: 6,290
Loc: Star Wars Galaxy
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Re: Flow Hood help [Re: camplo]
#21353330 - 03/02/15 07:02 PM (9 years, 10 months ago) |
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Quote:
camplo said:

I imagine the flame it's adjusted to the minimum? I would try it with a BIC lighter though perhaps it will bend more than 45º
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camplo
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Registered: 02/10/08
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It isnt adjusted to minimum, it would just go out. A bic lighter, when tested, is at the point where it almost doesn't blow out....but does... but like I said, being able to keep a bic lighter lit, isn't a necessity for laminar flow more like a rule of thumb for mush culture. I'm getting a little over 200cfm for sure but not an crazy amount over.
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Edited by camplo (03/02/15 07:07 PM)
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Mr. Alien
I will abduct andprobe your anus



Registered: 01/14/14
Posts: 6,290
Loc: Star Wars Galaxy
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Re: Flow Hood help [Re: camplo]
#21353352 - 03/02/15 07:06 PM (9 years, 10 months ago) |
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Quote:
camplo said: It isnt adjusted to minimum, it would just go out. A bic lighter, when tested, is at the point where it almost doesn't blow out....but does... but like I said, being to keep a bic lighter lit, isn't a necessity for laminar flow. I'm getting a little over 200cfm for sure but not an crazy amount over.

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mushpunx
Fungus Punk



Registered: 04/20/14
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Oh man I wish I had a grate in front of mine just the slightest bump bends all the pins!
My hood blows my bic lighter closer to 90 degrees, maybe less. Almost amywhere around the filter, it blows pretty even
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camplo
Freedom!


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Re: Flow Hood help [Re: mushpunx]
#21361114 - 03/04/15 12:53 PM (9 years, 10 months ago) |
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Mine is blows slightly stronger than that, just barely enough to blow out the flame, sometimes the flame will stay lit for a second and then go out.
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blojo02184
Big Red



Registered: 05/15/13
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Re: Flow Hood help [Re: camplo]
#21361177 - 03/04/15 01:06 PM (9 years, 10 months ago) |
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Just an fyi bud, you hold a bic like your lighting a cigarette so the heat and flame travel upwards. The laminar flow will then bend the flame.
It doesn't work to the side like that because heat rises.
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