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DrAbominable
derp

Registered: 01/18/06
Posts: 155
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Micron size.
#5503165 - 04/11/06 11:43 AM (17 years, 9 months ago) |
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A filter that filters out .12 microns is more efficient than a .1 rated filter?
 Peace
-------------------- lolwut
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Premedman1
Assistant to the insistent


Registered: 12/21/05
Posts: 2,376
Loc: South of Sanity
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I wouldn't think so, since .12 is larger than .10, therefore allowing slightly larger particles to permeate. .02 microns is negligible, though. WTF do you need a filter like that for, anyways?
-------------------- Build a man a fire, he is warm for the night. Set a man on fire, he is warm for the rest of his life.
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Nibin
Getting there


Registered: 11/29/05
Posts: 4,480
Last seen: 10 years, 8 months
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considering that average bacteria are between .5 and 5 micrometres in diametre, that kind of filter is a huge overkill unless you want to prevent your shrooms from catching bird flu
-------------------- Newcomers guide-----> For all things shroomy
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DrAbominable
derp

Registered: 01/18/06
Posts: 155
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Re: Micron size. [Re: Nibin]
#5503729 - 04/11/06 02:04 PM (17 years, 9 months ago) |
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Just wondering, found one cheap so might as well use it.. 2'x 4' Just making sure it will do the job.
Peace..............
-------------------- lolwut
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freshlyPLUMP
Toke the Smoke


Registered: 02/01/06
Posts: 573
Loc: My Shelter of Dark Tranqu...
Last seen: 17 years, 4 months
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yeah it will bro, no worries
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I bring myself down a level to make you feel better about yourself!
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RogerRabbit
Bans for Pleasure


Registered: 03/26/03
Posts: 42,214
Loc: Seattle
Last seen: 11 months, 3 days
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The best of the best flowhoods will still allow viruses to pass through. You want a bit smaller micron size than that if it's for a flowhood. .03 micron is the standard. You have to catch fungi spores as well as bacteria. 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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DrAbominable
derp

Registered: 01/18/06
Posts: 155
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I'm a bit confused. This thing is rated to catch.12microns @ 99.99%. So .01 mcron or .03 is smaller than .12? Im having problems understanding this!
Thanks
-------------------- lolwut
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Premedman1
Assistant to the insistent


Registered: 12/21/05
Posts: 2,376
Loc: South of Sanity
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Quote:
DrAbominable said: So .01 mcron or .03 is smaller than .12? Im having problems understanding this! Thanks
Yes, yes it is. 0.001 is one one-thousandth of a given unit, which is smaller than 0.01, which is one one-hundredth.
-------------------- Build a man a fire, he is warm for the night. Set a man on fire, he is warm for the rest of his life.
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mogur
regnartS

Registered: 11/15/05
Posts: 322
Loc: Puget Sound
Last seen: 11 years, 2 months
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The standard for HEPA filters is .3 microns at 99.97% efficiency. 0.3 microns is the most penetrating particle size (MPPS). A common misconception is that particles smaller than the MPPS are filtered less effectively. HEPA filters are a mat of fibers, and the path through the filter is not just a certain sized tunnel. It is a torturous path that filters by four different mechanisms, straining, impaction, interception, and diffusion. Here's a photo of a HEPA filter magnified 500 times-

Straining is simply the stopping of particles that are larger than the openings, so anything much larger than 1 micron are trapped.
Impaction results when particles about 1 micron in size fly into the fibers of the filter and are impaled and entrapped by the collision.
Interception is effective on particles larger than 0.1 and smaller than 1 micron in size. These lightweight particles flow around the fibers until they finally make contact, and are captured by van der Waal's forces (intermolecular attraction).
Anything smaller than .1 micron is subjected to random motion caused by collisions with air molecules. Responsible for gaseous diffusion, it is also known as Brownian motion, and greatly increases the likelihood that these particles will come close enough to a fiber to be trapped by van der Waal's forces.
So the surprising thing about HEPA filters is that the .3 micron specification is the size of particle least effectively filtered, anything larger or smaller is even more efficiently filtered than 99.97%.
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DrAbominable
derp

Registered: 01/18/06
Posts: 155
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Re: Micron size. [Re: mogur]
#5506263 - 04/12/06 12:04 AM (17 years, 9 months ago) |
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I see thanks for the insight!
-------------------- lolwut
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