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Rectangular wing profile type air flow measuring device for large air duct is mainly used to measure flue gas flow and air flow in rectangular cross section pipe of boiler system, such as the measurement of cross section flow of primary air, secondary air and over-fired air in large coal-fired power plant and thermal power plant. The accuracy of wing profile type air flow measuring device can reach 1%, and it has a good stability. The structure is a patent structure which is developed and designed by our company, and it has the advantages of good rectification effect, stable measurement, and small amount of maintenance, easy installation, long service life, and big differential signal.