Ключевые слова: air, aluminum, architectural, architecture, background, building, business, city, closeup, conditioner, conditioning, construction, day, decoration, department, design, detail, duct, engineering, equipment, exterior, facade, factory, firm, frame, grunge, horizontal, house, industrial, industry, manufacturing, metal, metallic, old, outdoor, outside, pipe, pipeline, sky, steel, structure, system, technology, tube, urban, vent, ventilation, vintage, wall, windows,