View attachment 495823
This is what happens in an air tight grow room, very bad for plants.
The room is 4 long and 5 meters wide (my bedroom). The CO2 peaked at 1250 from my breathing overnight. Then I sealed up the room and left. Over the next 36 hours the two Tyrones sucked up all the Carbon Dioxide down to 27, yep 27 PPM. They were gasping for air.