GB/T 9068-1988 For the measurement of noise of heating ventilating and air conditioning equipment. The standard adopts engineering method and is suitable for the measurement of noise sound Power level of such equipment. Clarify the measurement principle, specify the required equipment and accuracy requirements. Detail the test environmental conditions, such as background noise control range. Standardize the arrangement of measuring points, and determine the position and number of measuring points according to the shape and sound characteristics of the equipment. Give the calculation method of equipment operating conditions setting and sound Power level. Provide a unified process for noise measurement of heating ventilating and air conditioning equipment, help enterprises control the noise performance of products, and improve the indoor acoustic environment mass.