Active Air Supply is recommended for bigger Growings with more than two lamps and for smaller spaces, like in growtents where constant air exchange is necessary to avoid overheating.

Important: The power of the air supply has to be smaller than the power of the air extraction. Otherwise the air gets blown out by cracks and not through the air extraction with the filter. For example: An extraction device with 350m³/h should be combined with a supply appliance with 250 to 300m³/h maximum.

These are the most popular fans for air-supply: