The cooling tower size and shape will decide which kinds of fills will be used. Round cooling towers use the fill media with a round shape, square cooling towers use the square or rectangle shape. There is another special shape of the fill, such as the trapezoid shape fill,it can be used in square cooling tower too.About the cooling tower fill thickness, It ranges from 0.27mm to 0.5mm. Some people thought the thicker, the better. Considering the tower’ s size and installation method,we advise to use the suitable thickness. If the width is less than 1.22meter, we advise to use the thickness less than 0.38mm; if the thickness is more than 1.22meter, such as 1.52meter, we advise the thickness should be more than 0.38mm. It is like a paper. If the width is very large, the thickness should be thick enough to bear the weight and strength.