A. Air volume and wind speed detection must be carried out first. All purification effects are obtained under the designed air volume and speed. B. Before testing, check whether the fan is running normally, and measure the size of the tested air outlet and air duct on the spot. C. For a unidirectional flow (laminar flow) clean room, the air volume is determined by the method of the average wind speed of the room section and the product of the clean area. (Take the section 0.3m away from the high-efficiency filter perpendicular to the airflow as the sampling section, and set no less than 5 test points on the section according to the distance between the test points should not be greater than 0.6m, and the arithmetic mean of all readings is taken as the average wind speed.) Straight The measurement section of the one-way flow (laminar flow) clean room is based on the horizontal section of 0.8m~1m on the ground; the measurement section of the horizontal one-way flow (laminar flow) clean room is based on the vertical section of the air supply surface 0.5m~1m; section The number of upper test points should not be less than 10, the spacing should not be greater than 2m, and evenly arranged. D. For the tuyere with a filter, the air volume is determined by the product of the average wind speed of the tuyere section and the net sectional area of the tuyere. (On the section of the tuyere or the section of the reference auxiliary air duct, the average wind speed is obtained by not less than 6 evenly arranged test points.) E. When there is a long branch pipe section on the windward side of the tuyere and holes have been or can be drilled , the air volume can be determined by the air duct method. (Before the air outlet, punch holes not less than 3 times the diameter of the pipe or 3 times the length of the large side;) F. For a rectangular air duct, divide the measured section into several equal small sections, each small section is as close to a square as possible, and the sides The length is not more than 200mm, and the test point is located in the center of the small section, but there should not be less than 3 test points on the entire section; for a circular air duct, the measurement section should be divided according to the equal-area ring method and the number of test points should be determined; on the outer wall of the air duct The center of the open surface, but there should not be less than 3 test points on the entire section; for circular air ducts, the measurement section should be divided according to the equal-area ring method and the number of test points should be determined
