On the basis of pil í ov á are logical, the pillar that it is developed, in horizontal position hurdis ceilings. Pil í ov á lead to the shape of parallelepiped, and sinus cavities are reinforced at the center of object function different provided around it. It is the angle inclined-plane by her to hurdis ceiling boards to input cavity, the ceiling of the rib cage angle of rib of external circuit and internal staff close to other side's accessory in corners and corresponding shape and size, on forehead. The adjustment of external circuit is all necessary their odsek á n í rib cages. R structures.
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