Gas turbines (GT) are air-breathing engines, sensitive to changes in ambient temperature and pressure where GT power output decreases with increased ambient air temperature. This is due to a reduction in the density and mass flow of intake air.

By cooling the inlet air, it is possible to retain the lost power output of a GT. The injection of water into the inlet duct of a GT is now a well-established tool of air inlet cooling. This technique is commonly known as inlet fogging.

The fine mist of water droplets, often referred to as 'fog', is injected into the air intake by a nozzle manifold, and usually mounted near the air filters.

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