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The inner surface of the static pressure box is affixed with a sound absorbing and shock absorbing material, which can act as a sound absorbing effect, and after the airflow enters the static pressure tank, the flow path is abruptly changed and expanded, which can reduce the gas flow pressure, increase the static pressure, and stabilize the air flow. The static pressure box is often installed in the air supply port of the air conditioning system and the air conditioner exit.