A circulatory system for the airflow in a plant growth chamber

The present invention relates to a circulatory system for the airflow in a plant growth chamber, which consists essentially with an air intake passage set on the top thereof and extending inwards. A plurality of fans erected inside the air intake passage can draw the air in the growth chamber into the air intake passage through the air inlets being formed on the air intake passage. After the air drawn into the air intake passage is cooled down by an evaporator also set inside the air intake passage, it can be led to positions relative to the plant tubes being fitted to each of shelves on the both sides thereof by an air outlet guide, and then blown out towards the plant tube with a preferable temperature via a plurality of air outlets arranged on the air outlet guide. According to the above, the proper temperature can be spread averagely in the growth chamber so as to make plants grow well for the main purpose.