Ключевые слова: air, air conditioners, air duct, bacteria, building, canteen, care, ceiling, cleaning, cold, condition, conditioner, conditioning, construction, cooling, copd, dirty, distribution, duct, ducts, dust, factory, fresh, grill, health, heat, heating, hole, industrial, industry, infection, interior, maintenance, metal, office, pipe, pipeline, pipes, piping, pneumonia, pneumoniae, respiratory, silver, streptococcus, system, technology, tube, tuberculosis, vent, ventilation,