Use a carbon filter on your outlet and the activated charcoal should take care of any smell. Neg ion purifiers are not needed and they are too damn expensive for a private grow. You have to let the air circulate and the only way is if the air you're pumping in has a way to escape.
psychocat Reviewed by psychocat on . Is intake and exhaust required with envirolites(200w)? High, I've got a project with 7 lowryder no.2's in a 60cmx120cm, 200cm tall growroom, I'll be using one 200w envirolite(white spectrum) until flowering starts, then add another one with red spectrum, use these until harvest. My question is, as these envirolites shouldn't produce much heat, will I be needing intake and exhaust? There would be one or two fans blowing towards the lamps and Co2 will be given with these: No Mercy Supply . I'll be turning the lights off for one hour each day Rating: 5