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You can use Ozone for pest control.Fleas,bedbugs,Black Mold etc.
I had a leak in my roof a few weeks ago, and was worried about black mold.
Was looking for commercial strength Ozone machines ,and i came across this website that sells them.
They have a lot of video's showing how strong and dependable their Ozone machines are.
Watch the 1hr plus video first.
He talks about the Pest Control abilities he uses Ozone for besides auto dealers and hotels.
We Offer 4 Turnkey Equipment And Business System Opportunities : START YOUR VERY OWN Business !
http://www.ozonegenerator20000.com/Contrator-Machines-for-Sale/start-your-own...
P.S.
I got a Perma Vent 312 for my roof. Working great.
Didn't have to remove or fool with the shingles. About $33 after shipping if you can't find one at your local Home Depot or Lowes.
http://www.youtube.com/watch?v=jepGaQZ_RLQ
Perma Vent video