i don't know what other ill effects are from too much ozone. i figured i'd shut mine off if i had a continuous sore throat

i don't use the ball - i just heard good things about it on this forum.

if you build an exhaust area (great idea btw) you can just get a carbon filter and attach the exhaust fan to it and it will all be concealed. you can also put the carbon filter on the inside and use the exhaust fan to suck all the air in the cabinet through it before it gets to the outside.

with a carbon filter you shouldn't need the ozone generator for just a few plants.