For chimneys whose height is <45 meters, only a layer of low-intensity aviation obstruction lights can be installed on the top of the chimney.
Chimneys with a height of > 45 meters should be equipped with multi-layer medium-intensity aviation obstruction lights, and the distance between each layer should not be greater than 45, and wait as much as possible.
Chimneys with a height> 150 meters can be equipped with high-intensity type A obstruction lights. The spacing is controlled within the range of 75-105 meters, and low and medium intensity obstruction lights are set between the high-intensity A-type obstruction lights.
Chimneys with a height of less than 150 meters can also use high-intensity type A obstruction lights. After using high-intensity type A obstruction lights, it is not necessary to mark the chimney with color code paint.
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