NOTE: This version features 2 fans. Our ForeverOzone (tm) OG-14400 Shock Treatment Ozone Generator creates "shock" levels of ozone in rooms up to 1500 sq ft (with 10ft ceilings). It features two 7KV power transformers, two 100 CFM fans, and 4- 3600 mg/h high voltage ozone elements. (rated under 40% humidity). Unlike all other ozone generators on the market, this ozone generator is built without any "prone to fail" parts; electronic parts with metal inside, things like switches, timers, relays, mother boards, etc. The OG-14400 is made out of solid oak and stainless steel. The Generator and ceramic high voltage plates are ozone proof. The fan is made to withstand ozone for 10,000 hours. (replacement only $23 ea / free S&H). HOW MUCH OZONE DO I NEED? Generally speaking, you want to create ultra high levels of ozone in the air for short periods of time to perform successful ozone shock treatments. Low levels of ozone over long periods of time (24-48 hrs) as some ozone vendors recommend will deteriorate the foam in furniture and the carpet's padding and leave an "ozone smell" that will stick around for days. To avoid that, follow our suggestions and do SHORT, HIGH CONCENTRATION ozone shock treatments! One to six hours max, that's all it takes! Bacteria, viruses, mold, etc will begin to die within minutes. Bed bugs, dust mites, etc will die within the hour. VOC's will break down within minutes as well. The secret to a successful ozone shock treatment is to get in and out as quick as possible. Ozone works quickly to destroy odor causing substances and going longer than our recommendations is not advisable.