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This design utilizes throttling effect. The stable flow process of high-pressure gas flowing to the low-pressure side through multi hole plug, small hole, valve with small diameter and capillary is called throttling process. One side of the paper box is made into an orderly funnel shape, which can be cut down and placed on the window to control the air pressure to cool down. Hot poor areas, such as Africa, can cut paper boxes for air conditioning after receiving airdrop materials, which solves the problem that poor areas cannot afford air conditioning.