Hi, I’m hoping someone will be able to help me, I’m a complete newbie when it comes to growing my own and information on the net can be somewhat overwhelming..nearly putting me off, however I’ve finally (nearly) Finished setting up my little grow room, I’m going to start off with autos, however I have made my grow space light and almost airtight for future grows with a 12/12 light schedule. I have a fan ducted out of the room to outside with a carbon filter in my room at the other end, along with a clip on fan at the bottom, light is in and I’m ready to rock n roll...my long winded question is this. Do I need another vent where the clean air can be sucked into the room, as when I turn everything on now, it causes a suction/vacuum in the room, this doesn’t seem right. Any help or advice much appreciated, From a keen excited newbie grower! ✌️✌️