- Relative humidity (RH)
- See related figure: Humidity: keeping water inside the mushroom →
How full the air is of water compared with the most it can hold at that temperature.
- CO2 (carbon dioxide)

AI illustration · details
AI teaching illustration. Instrument concept for discussing CO2 measurement; not a verified product, calibration, sensor location or ventilation prescription.
Open full image ↗The gas the fungus breathes out; high during spawn run, must be low during fruiting.
- Air change
- Outside airRoom airExhaust
Concept only—not a duct layout or airflow rate. Replacing the whole volume of room air with outside air once.
- Lux
- See related figure: Light, and reading the crop →
A unit of light brightness; 200 lux is a dim but readable room.
- Bed temperature
- See related figure: Temperature is the first filter →
Temperature measured inside the growing material; biological activity and heat transfer can make it differ from room air.
Environment
Visual glossary
