Ключевые слова: abstract, aluminum, background, black, blades, blow, circle, conditioner, conditioning, cool, cooler, cooling, dark, equipment, fan, gray, grid, grille, hexagon, hexagonal, hole, honeycomb, industrial, industry, iron, lattice, latticed, machine, machinery, macro, mesh, metal, metallic, object, pattern, perforated, perforation hexahedron, power, propeller, protection, shiny, steel, technology, texture, turbine, vent, ventilation, ventilator,