budget hepa box
Posted 14 June 2006 - 09:20 PM
If it draws smoke into the seams anywhere after the filter then it ain't no good.
Posted 14 June 2006 - 09:22 PM
and it worked well.
i'm inclined to extend him
the benefit of the doubt...
maybe the manufacturer has
improved the design ?
might be time
for a 2nd look...
Posted 14 June 2006 - 09:38 PM
Posted 15 June 2006 - 03:11 AM
Posted 21 June 2006 - 08:23 AM
One is to replace the HEPA like filter in the purifier with a true HEPA, but the size would be very difficult to obtain if not impossible as it would be custom made specifically for this machine.
two, if I sterilize the air that is going thru the merv11 filter. Behind this filter is a 6" plenum, and so I fitted an 8w UV-C tube in the ceiling as in the picture and will test the air that comes out at the other side of the merv11 by exposing 6 agar plates from 30-180 seconds at 30 sec intervals.
Posted 22 June 2006 - 02:06 AM
Posted 09 July 2006 - 12:08 PM
I opened 6 agar plates that have been sitting for three days, in the picture they are numbered from 30 to 180 and one control C.
All were opened at the same time except for the control, then 30 sec later the 30 plate was covered, then the 60....then after two minutes I waited for another minute and covered the 180. The plates were clingwrapped and incubated @ 85F for 48 hours.
So far none have shown any sign of contam. my previous setup grew contam with even brief exposure and the only difference now is the added UV. Could this be the answer?
I intend to keep the plates a little longer to see if any contam will grow.
Posted 12 July 2006 - 12:53 PM
conclusion: airpurifier+UV+merv11 flowhood is equivalent to HEPA flowhood
Posted 12 July 2006 - 06:27 PM
Posted 13 July 2006 - 03:34 AM
here's some info about UV-C (germicidal UV)
Germicidal ultraviolet (UVC) light kills cells by damaging their DNA. The light initiates a reaction between two molecules of thymine, one of the bases that make up DNA. UV light at this wavelength (shortwave UV or UVC) causes adjacent thymine molecules on DNA to dimerize.
The longer the exposure to UVC light, the more thymine dimers are formed in the DNA. If cellular processes are disrupted because of DNA damage, the cell cannot carry out its normal functions. If the damage is extensive and widespread, the cell will die.
If the light doesnt kill the cell it will damage its DNA and cause mutations, in the case of human cells it will cause skin cancer. (we're talking about long exposures here, but susceptible skins may not take that long)
Posted 13 July 2006 - 08:29 AM
this ain't your blacklight UV
but rather high energy,
harmful to humans and shrooms alike
just for zapping stuff
turn off before working in area