Ключевые слова: aged, air, airway, architectural, bars, blank, conditioning, conduit, crisscross, duct, exhaust, facade, frame, grate, grid, grille, grunge, grungy, hole, inlet, louver, matrix, metal, metallic, old, outlet, panel, passage, passageway, pattern, rugged, rustic, sealed, secured, shutter, sidewall, structure, surface, symmetrical, valve, vent, ventilate, ventilation, vintage, wall, weathered, window,