Hey Guys, I'm just about to do my first C02 grow. I have a nearly completely sealed room that has a carbon filtered exhaust system (with non-return valve so when fan is off it's quite sealed) on a timer. I'm running a Sentinel monitor and doser connected to a solenoid on a large C02 bottle. I have an unlimited supply of C02. I was wondering if it's good practice to vent the room when the lights and C02 are off? This means the room gets a change of air each day. Thanks, J.