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OfflineKalypto
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Registered: 09/19/12
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Final LFH questions
    #19264813 - 12/12/13 08:37 AM (10 years, 2 months ago)

Couple of things I want to clarify before I start buying parts.

If my filter is rated for .9 or 1 inch does my blower need to be rated for that?

Is it possible that a blower that can only go to .7 for example would be able to meet the resistance but at a reduced CFM rate?

If im not mistaken we want between 100-200 CFM coming out of our filter so I would need to find a blower that does 100-200 CFM at 1.2 inch if I add some pre filters?  Or is it 100-200 CFM per sq ft of filter surface area.

Would that mean for a 2ft x 2 ft hepa filter I would need 400 CFM at 1.2 inch static pressure?

Also what is required for laminar flow?

Is that just what the filter creates?

Or do I need to line up the filters to create the laminar flow?

Can or should I put all my filters together or not?

Also If I decide I want to put 2 2x2 next to each other , for the pre filters If I add them so the blower pushes through one set then splits the air how will that work with static pressure , should I just have a pre filter on each HEPA filter

Posting here cause I couldnt get what I was looking for from the normal cultivation forum


Edited by Kalypto (12/15/13 10:42 AM)


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OfflineKalypto
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Re: Final LFH questions [Re: Kalypto]
    #19269875 - 12/13/13 09:09 AM (10 years, 2 months ago)

bump
I  have spent a bunch of time reading the articles


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OfflineTheCyndicate
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Re: Final LFH questions [Re: Kalypto]
    #19278477 - 12/15/13 10:01 AM (10 years, 2 months ago)



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OfflineKalypto
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Re: Final LFH questions [Re: TheCyndicate]
    #19278681 - 12/15/13 10:40 AM (10 years, 2 months ago)

Already read that many times still have the same questions


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Offlinefractaldill
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Re: Final LFH questions [Re: Kalypto]
    #19279359 - 12/15/13 01:11 PM (10 years, 2 months ago)

If youre looking for a blower that matches a 2x2 filter, you need to have a blower that can push 400+ cfm at 1.2" laminar flow is what will come out of the filter at the 100-200 cfm range i believe. put the prefilter before the blower. Why would you put 2, 2x2's together? you just need one hepa, and a filter of some type over the blower.


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InvisibleinskiM
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Re: Final LFH questions [Re: fractaldill]
    #19281662 - 12/15/13 10:40 PM (10 years, 2 months ago)

Quote:

fractaldill said:
Why would you put 2, 2x2's together?.



I suspect it's because he would like a working area of 2x4ft.


--------------------


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Offlinefractaldill
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Re: Final LFH questions [Re: inski]
    #19281700 - 12/15/13 10:53 PM (10 years, 2 months ago)

ah... i read it as he was going to have 2 hepas one after the other.


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OfflineKalypto
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Re: Final LFH questions [Re: fractaldill]
    #19282341 - 12/16/13 03:32 AM (10 years, 2 months ago)

No I was going to do 2x4 feet cause the only blowers I could find at the right SP put out around 800 cfm


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OfflineTheCyndicate
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Re: Final LFH questions [Re: Kalypto]
    #19282787 - 12/16/13 08:27 AM (10 years, 2 months ago)

Quote:

Kalypto said:
No I was going to do 2x4 feet cause the only blowers I could find at the right SP put out around 800 cfm



That would weigh a fucking ton.

Cyn


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OfflineKalypto
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Re: Final LFH questions [Re: TheCyndicate]
    #19282804 - 12/16/13 08:31 AM (10 years, 2 months ago)

Quote:

TheCyndicate said:
Quote:

Kalypto said:
No I was going to do 2x4 feet cause the only blowers I could find at the right SP put out around 800 cfm



That would weigh a fucking ton.

Cyn




Ill just make it so it breaks down then


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Offlinet3chnobily
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Re: Final LFH questions [Re: TheCyndicate]
    #19282813 - 12/16/13 08:35 AM (10 years, 2 months ago)

I did it and it works fine.  Does way a ton though....






Build


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OfflineKalypto
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Re: Final LFH questions [Re: t3chnobily]
    #19282825 - 12/16/13 08:39 AM (10 years, 2 months ago)

Dont get me wrong I would rather do 2x2 I just cant find a blower putting out the right SP at anywhere near a low enough CFM


Quote:

t3chnobily said:
I did it and it works fine.  Does way a ton though....






Build





I like your build , you said its still blowing kind of hard?

Have you tried adding more filters or does that go above the SP limit and stop working


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Offlinet3chnobily
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Re: Final LFH questions [Re: Kalypto]
    #19282834 - 12/16/13 08:45 AM (10 years, 2 months ago)

I found a 16 x 20 air cleaner hepa that fit the intake and that brought my flow down too acceptable ranges according to lighter test.  I get no contamination working in my open lab in my less then sterile basement.

I never found a flow rate for my blower just kept stacking filters till it behaved itself.


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OfflineKalypto
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Re: Final LFH questions [Re: t3chnobily]
    #19282839 - 12/16/13 08:48 AM (10 years, 2 months ago)

Quote:

t3chnobily said:
I found a 16 x 20 air cleaner hepa that fit the intake and that brought my flow down too acceptable ranges according to lighter test.  I get no contamination working in my open lab in my less then sterile basement.

I never found a flow rate for my blower just kept stacking filters till it behaved itself.




Im gonna have like 3 after the blower and x before to get speed right unless I go 2x4


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Offlinet3chnobily
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Re: Final LFH questions [Re: Kalypto]
    #19282851 - 12/16/13 08:54 AM (10 years, 2 months ago)

If you don't want to go that big just get a motor speed contoroller

or a smaller blower


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OfflineKalypto
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Re: Final LFH questions [Re: t3chnobily]
    #19282855 - 12/16/13 08:56 AM (10 years, 2 months ago)

Quote:

t3chnobily said:
If you don't want to go that big just get a motor speed contoroller

or a smaller blower



Will I be able to maintain SP with the speed reduced?

I have literally spent hours looking for a blower that does like 500 cfm at 1.2


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Offlinet3chnobily
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Re: Final LFH questions [Re: Kalypto]
    #19282863 - 12/16/13 08:58 AM (10 years, 2 months ago)

yes just hold the lighter in the flow and turn the dial until it it hits 45 degree.  They are nice because as the filter clogs up you can turn it up a little to maintain flow.

Edit:  Make sure your motor is compatable


Edited by t3chnobily (12/16/13 08:59 AM)


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OfflineKalypto
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Re: Final LFH questions [Re: t3chnobily]
    #19282874 - 12/16/13 09:01 AM (10 years, 2 months ago)

Quote:

t3chnobily said:
yes just hold the lighter in the flow and turn the dial until it it hits 45 degree.  They are nice because as the filter clogs up you can turn it up a little to maintain flow.

Edit:  Make sure your motor is compatable




Awesome , That may save me a few hundred on a motor.


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OfflineRogerRabbitM
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Re: Final LFH questions [Re: t3chnobily]
    #19282983 - 12/16/13 09:42 AM (10 years, 2 months ago)

Quote:

t3chnobily said:
I found a 16 x 20 air cleaner hepa that fit the intake and that brought my flow down too acceptable ranges according to lighter test.




Perfect.  Those filters should make your expensive flow hood filter last essentially forever.  I've been on the same flow hood for 12 years now, and that's just from using top of the line furnace filters.  I run it about 4 hours every day, 7 days a week. The prefilter gets dirty and starts to clog after about three months.  Simply replace it and on you go.
RR


--------------------
Download Let's Grow Mushrooms



semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
Thomas Edison


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OfflineKalypto
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Re: Final LFH questions [Re: RogerRabbit]
    #19283071 - 12/16/13 10:06 AM (10 years, 2 months ago)

Awesome , do you know what the MERV rating is on your filters?
Are electrostatic prefilters bad?


Edited by Kalypto (12/16/13 10:08 AM)


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