Hush kit

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A hush kit is an aerodynamic device used to help reduce the noise produced by older aircraft jet engines. These devices are typically installed on older turbojet and low-bypass turbofan engines, as they are much louder than later high-bypass turbofan engines.^[1]

Hush kits are used because the engines on jet aircraft generate a large amount of noise, which significantly increases noise pollution near airports.^[2]