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OfflineRosen_Rot
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Registered: 12/06/14
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More ducting on my laminar?
    #23779006 - 10/28/16 01:29 AM (7 years, 3 months ago)

Hi guys so I have just finished constructing my laminar flowhood.

Specs;

Filter; FLANDERS Stainless steel 99.99 HEPA 21.75'' x 20.0'' X 4.625'' 220CFM
Blower; CA 150 MD Centrifuge blower Link to Spec sheet




When I went to turn it on I do not think I was getting laminar flow and I am suspecting that I need more ducting. The fan is situated on top of the filter, blowing air into a space which in return is pushed out through the filter, typical standard build. As air ducting I am using a 4inch wide flower pot which I siliconed to the side of the top box that encases the blower. As a pre-filter I am using standard doubled folded polyfil attached to the mouth of the ducting.




In this picture it shows polyfil first stuffed in the intake before being covered with a polyfil sheeting. I REMOVED the polyfil from inside and only have the sheeting on the outside now. Laminar flow still sucks.



I also cut the bottom of the flower pot ducting to allow more air in, it has improved but I do not believe I have reached laminar flow. The flame seems more 80 degrees than the 45 degree angle aim



--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   


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Offlineenlightenment
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Re: More ducting on my laminar? [Re: Rosen_Rot]
    #23779032 - 10/28/16 01:56 AM (7 years, 3 months ago)

Do you have the data sheet of the filter?
It looks like your blower is not powerful enough because it would need around 670m³ volume flow without pressure for a filter in this size. To get a flow of 0,5m/s + pre filter + factor in the PA curve of your filter... i think it is too weak. Sorry.


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Offlinewtfcrazymofo
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Re: More ducting on my laminar? [Re: Rosen_Rot]
    #23779088 - 10/28/16 02:57 AM (7 years, 3 months ago)

You need close to 375cfm@1.2 SP so you need about a 650-750cfm blower.  Did the polyfill get jammed in your blower? Throw that polyfill away and use a house filter.


--------------------
If you want to eat->https://www.shroomery.org/forums/showflat.php/Number/8553541

Bag sealers are to bulky (my hood isn't that big)
https://www.shroomery.org/forums/showflat.php/Number/28622922




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OfflineRosen_Rot
Learning
I'm a teapot


Registered: 12/06/14
Posts: 1,225
Loc: Goa
Last seen: 11 months, 22 days
Re: More ducting on my laminar? [Re: wtfcrazymofo]
    #23779128 - 10/28/16 03:42 AM (7 years, 3 months ago)

This is the spec sheet that came with it and it's rated at 200CFM. I am in a little hurry right now cause I am late for a class, I'll find a flanders spec sheet once I get home



The filter and blower are the same a Supalemonhaze and his laminar works completely fine. I took off the casing that covers the blower and more air is being pushed but a little bit too powerful now. I honestly think it's the ducting and not enough air is being sucked into the blower to be pushed out


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   


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Offlinewtfcrazymofo
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Registered: 07/26/15
Posts: 1,201
Loc: Colonial alley
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Re: More ducting on my laminar? [Re: Rosen_Rot]
    #23779138 - 10/28/16 03:52 AM (7 years, 3 months ago)

In the you tube vid it did sound stifled. Pluck the fill.  Turn it up to max blow.  Check that with a bic.


--------------------
If you want to eat->https://www.shroomery.org/forums/showflat.php/Number/8553541

Bag sealers are to bulky (my hood isn't that big)
https://www.shroomery.org/forums/showflat.php/Number/28622922




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Invisibleblindingleaf
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Re: More ducting on my laminar? [Re: wtfcrazymofo]
    #23779161 - 10/28/16 04:12 AM (7 years, 3 months ago)

Quote:

I took off the casing that covers the blower and more air is being pushed but a little bit too powerful now. I honestly think it's the ducting and not enough air is being sucked into the blower to be pushed out




i had a similar situation with mine.  i don't have housing for my blower, so the pre filter has to be right up against the blowers intake (its squirrel cage style but still applies).  when i used a "nicer" pre filter, the flow would be too slow.  NO pre filter, and the flow is too fast.  so i got one of these

http://3u0gdv3vukuf15vp9312siwh2cg.wpengine.netdna-cdn.com/wp-content/uploads/2015/04/Screen-Shot-2015-04-07-at-2.25.46-PM.png

it barely filters more than a green scrubby, but it affects the intake perfectly for me.


--------------------
A few thoughts on cultivation
MICROBIAL HUSBANDRY!!!!

The whole is greater than the sum of its parts


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InvisibleliloldmeFacebook
( ͝° ͜ʖ͡°)つ=D
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Re: More ducting on my laminar? [Re: blindingleaf]
    #23779202 - 10/28/16 04:46 AM (7 years, 3 months ago)

My blower motor is too hardcore for my little 12x24 flowhood. I'm using 2 layers of cotton fabric to slow it down as my prefilter.


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Invisibleblindingleaf
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Re: More ducting on my laminar? [Re: liloldme]
    #23779211 - 10/28/16 04:50 AM (7 years, 3 months ago)

i love hardcore blowers tho:crazy2:


--------------------
A few thoughts on cultivation
MICROBIAL HUSBANDRY!!!!

The whole is greater than the sum of its parts


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OfflineRosen_Rot
Learning
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Registered: 12/06/14
Posts: 1,225
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Last seen: 11 months, 22 days
Re: More ducting on my laminar? [Re: blindingleaf]
    #23779429 - 10/28/16 07:22 AM (7 years, 3 months ago)

What makes my situation more comfortable is that I have reference with a local, and very good at that, grower. I am using the same filter size, same blower and same pre-filter material as him so as of this I am sure it is not the blower nor the filter otherwise there would be no success from his end.

I was considering buying something like that Leaf but over here we're kinda redneck. I believe my problem is the air intake comes from the top and the casing ventilation is on the side and only 4inches.

No I am using a 7inch duct on the top.

My predictions will be that now the flow will be too fast so it's a matter of adjusting my pre-filters till that lighter flame comes to 45

*sigh*

Another day another struggle

:moralsupport:


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   


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Invisibleblindingleaf
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Re: More ducting on my laminar? [Re: Rosen_Rot] * 1
    #23779447 - 10/28/16 07:34 AM (7 years, 3 months ago)

maybe try and use a green scrubby

that filter i linked is the most redneck of all "professionally" made pre filters….just look at it :lol:

supp is the shit, thats cool u guys are neighbors:cool: 

my hood isn't completely laminar. if u hold a lighter up to it, there is a section where it more like 45 degrees, but mostly its closer to 90. its fine for me.

edit: rinse the green scrubby first if u use it cause it always has a lot of green powder when u first use them.  big ups to my fellow current/former restaurant dishwashers on that pro tip, u know what I'm talking about:somefunnyshit:


--------------------
A few thoughts on cultivation
MICROBIAL HUSBANDRY!!!!

The whole is greater than the sum of its parts


Edited by blindingleaf (10/28/16 07:41 AM)


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Offlinesandy_vag
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Re: More ducting on my laminar? [Re: blindingleaf]
    #23779532 - 10/28/16 08:39 AM (7 years, 3 months ago)

That filter isn't a really good choice for a flowhood filter, it only has 0.39" wg resistance. You want more than that, around 0.8 - 1 inch. for a nice flowhood hepa filter. You can still probably use it with some success but it wont be ideal. Probably wont make a true laminar flow.


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Offlinesandy_vag
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Re: More ducting on my laminar? [Re: sandy_vag]
    #23779540 - 10/28/16 08:44 AM (7 years, 3 months ago)

You can get a bigger blower and use a $20 harbor freight "router speed controller" to control the fan speed also. Much cheaper than a labeled fan speed controller ($50+) and it's the exact same thing, you can dial in the fan speed no prob.


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OfflineRosen_Rot
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Registered: 12/06/14
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Re: More ducting on my laminar? [Re: blindingleaf]
    #23781691 - 10/29/16 01:20 AM (7 years, 3 months ago)

Quote:

sandy_vag said:
That filter isn't a really good choice for a flowhood filter, it only has 0.39" wg resistance. You want more than that, around 0.8 - 1 inch. for a nice flowhood hepa filter.




It has only 0.39'' because it's 4inches thick, not 6inches like your standard 24 x 24 x 6 filters. You just add .9 resistance and you'll get 100ft3/min flow filter face

Quote:

You can still probably use it with some success but it wont be ideal. Probably wont make a true laminar flow.




Yeah you can tell that to Supa and his LCs and numerous amounts of good genetic growth he achieved through the same filter and same blower :rolleyes: Nothing we construct is ever true laminar flow but close enough.

Quote:

sandy_vag said:
You can get a bigger blower and use a $20 harbor freight "router speed controller" to control the fan speed also. Much cheaper than a labeled fan speed controller ($50+) and it's the exact same thing, you can dial in the fan speed no prob.




Unnecessarily. My blower is matched up perfectly




Quote:

blindingleaf said:
supp is the shit, thats cool u guys are neighbors:cool: 





He's been the spice of my life. I'm glad I found a friend locally, now I can do things the European way :lol:


--------------------
:sporedrop:"The internet has one rule; use or be used" - Bjeldiablo :sporedrop:
''there is no loneliness, only moments where contentment is fleeting''

SBJs "The Basics"
3iRiS9 "Cirque du freak"
B+ BONANZA

   


Edited by Rosen_Rot (10/29/16 01:21 AM)


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