So, room within a room...My grow room is 4x5 foot. I use a 4 inch inline fan and scrubber that exits into the main room which is 28x18ft. I want to exhause into the room, as its in a basement, and I live up in the mountains so it keeps the room warmer. Intake for the grow room is also through the large main room. Now I have a air duct to bring fresh air in to the main room, an thus replentishing the grow room as well, but soon it will be winter, and I will not have the ability to use the outside air, as it will be far too cold. Would a small ozone generator in the main room help replentish co2 for fresh air for the plants through the winter? Thanks in advance...Still trying to figure this out before I get into the winter!