These CO2 hoses are suitable for crop ventilation.
With completely sealed foliage the ppm (parts per million) content of the CO2 falls within 10 minutes from 450 ppm to 100 ppm. This means that the plants stand almost still.
Ventilate your crop with the CO2 hose.
The CO2 hose can be obtained on a 500-metre roll, with a diameter of 40 mm