The tower packing with small and large louvers

 

A louver is a window, blind or shuttes with horizontal or, less often, vertical slats, that are angled to admit light and air, but to keep out rain, direct sunshine, and noise. The angle of the slats may be adjustable, usual in blinds and windows, or fixed.

This patent is about a tower made by LARGE and SMALL louvers. 

click here for information