The present invention relates to a facility such as a plastic house for growing crops (F) and a heating/cooling device (H) for controlling the indoor temperature, it is connected to the air outlet (HA) of the air-conditioning device (H) to evenly deliver hot and cold air to the room, , It relates to a distribution-type cold and hot air multi-stage duct that provides a good indoor environment for crops to grow by equalizing the temperature and air volume of the cold and hot air coming from the air outlet of the duct located near and far from the air conditioner (H). is a duct portion 10 through which hot and cold air from the air outlet (HA) of the air conditioner (H) is discharged into the room through the internal passage; and a duct provided at the end of the duct portion 10 in the direction in which the air conditioner (H) is located Distributing pipe 20 made of a rigid body having an inlet-shaped cross-section; and an anti-sag portion 30 that is combined with the upper portion of the duct portion 10 to prevent sagging of the duct portion 10; do it with
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