Ключевые слова: abstract, air, airvent, alloy, aluminium, architecture, background, blue, brick, building, business, cold, comfort, construction, cool, dirty, duct, engineering, equipment, factory, fan, gray, grill, grunge, heaven, hot, illustration, industrial, industry, iron, machine, metal, metallic, modern, office, outside, plant, power, roof, shiny, silver, sky, steel, technology, vent, ventilation, wall, window, work,