Hydroponics Ventilation:

Pure, fresh air is at the heart of all successful hydroponic gardens. Outdoors, air is abundant and almost always fresh. The level of C02 in the air over a field of rapidly growing vegetation could be a third of normal on a very still day. Soon the wind blows in fresh air. Rain cleanses the air from dust and pollutants. The ecosystem is always moving. When plants are grown indoors the balance that is present outdoors must be achieved indoors by way of fresh air ventilation or CO2 enrichment.