Ключевые слова: abstract, air, backdrop, background, backgrounds, channel, circle, clear, closeup, concepts, conditioning, control, cooling, cover, dark, design, duct, equipment, flow, gray, grid, grill, grille, industrial, industry, light, macro, mesh, metal, modern, multiple, object, pattern, perforated, plastic, punching, refrigeration, roll, steel, surface, symmetry, system, tech, technology, texture, textured, vent, ventilation, vents, wall,