Sand trap louvers are used for air intake as pre-filter for the protection of air conditioning plants. It has a high degree of separation of sand and large dust particles even in cases of high dust concentrations. The vertically arranged blades section and holes are for sand drainages to ensure that the sand trap louvers are self-cleaning and maintenance free. It is designed to separate large particles of sand and dust from the air stream at low air velocity, thus avoiding excessive dust loading of conventional filters; it is not intended as a substitute for conventional air filters