Do I need to bring in fresh air from outside if I am using a CO2 injection system? If not do I simply need to create a vent opening for fresh air to be pulled into the room when my environmental controller kicks in? I am planning upon running 2 rooms. One for veg, which will have a single can filter(carbon scrubber) with a fan attached directly inline, to pull the odorous air through the filter. I was not planning upon venting the veg room. Will this get rid of the smell? I am using a personally designed fluoro/led combo in the veg room so heat will not be an issue. Do I need to vent this room into the surrounding room if I am using CO2? For the flower room we are using 1600 watts of lighting. I am planning upon running a can filter with a fan( the exact setup as the beg) to filter the inner room air and then running another can filter with fan pulling the air through the filter then my light hoods and then exiting the room. All of this is controlled by the environment controller. Would I simply need to create a vent hole in the flower tent so that when the exhuast fan kicked on it can flow through? Will this arrangement get rid of all smell? Thanks for the help and sorry for the length of the post, just getting everything dialed in before beginning.