I run my carbon scrubber 24/7. Have my air cooled light hooked up so that it draws and exhausts only clean stink free air from outside grow room. The carbon filter works well but late in flowering she does emit some fairly fairly funky smells. The filter exchanges the air in my closet alot I guess since the fan is around 100 cfm, losing some through the filter and ducting, and my clos is only 80 cubic ft. Just got one of the small can fans