Ключевые слова: air, background, building, ceiling, conditioner, conditioning, construction, control, cooling, duct, electrical, energy, engineer, equipment, fan, heat, home, house, hvac, indian, indoors, industrial, industry, installation, installing, job, machine, maintenance, male, man, mechanic, modern, office, person, pipe, recuperation, repair, repairman, residential, service, steel, system, technician, technology, tool, tube, uniform, ventilation, work, worker,