Ключевые слова: abstract, air, airflow, background, blades, blower, building, cellar, circle, circulation, cold, conditioner, conditioning, cool, cooling, dust, engine, exchange, fan, filter, fresh, grid, heat, household, industrial, industry, machine, machinery, mechanical, mesh, old, pattern, pipe, rotate, rotating, round, structure, supply, temperature, texture, textured, turbine, vent, ventilate, ventilating, ventilation, ventilator, wall, window,