Diesel generator soundproof units are widely used in outdoor or indoor places with special requirements for environmental protection where protection and noise reduction are required. Its main features are that the soundproof cover is provided with sound insulation and sound absorption layers, the air inlet and exhaust channels are noise-reduced, and the exhaust adopts a combination of industrial and residential mufflers to reduce noise in high frequency and low frequency bands respectively. The noise of standard soundproof units is generally 78-85dB(A), and the noise of super soundproof units is generally 70-78dB(A). The super sound-proof unit is based on the standard sound-proof unit to take stricter control measures for noise emission, such as the use of labyrinth air inlet and exhaust channel design.

Super sound-proof units generally have larger dimensions, and the manufacturing cost is much higher than that of standard sound-proof units. Soundproof units and super soundproof units are usually operated, maintained and serviced outside the soundproof enclosure.