Multiple section ventilation grating - has round-section ribs engaging in mating recesses from front to rear

摘要

The ventilation grating comprises a number of sections, each with a number of air passages inside a rectangular frame, and mounted alongside or one above the other. Each section has round protruding portions and mating recesses by which it is coupled to the next one. - The protruding portions are round-section ribs (14) and the recesses correspondingly-shaped grooves, running in the direction from front to rear of the grating sections. Each section has in one of the two longer sides two grooves, and on the other two ribs, while the shorter sides have only one rib or groove.