GB/T 2423.61-2018 "Environmental testing - Part 2: Test methods - Test and guidance: Sand and dust test for large specimens": This standard applies to large specimens that are difficult to test using GB/T 2423.37 methods, covering equipment such as wind power generation devices, solar energy equipment in desert areas, and transportation vehicles. It is not applicable to non-abrasive fine dust and free-falling dust tests. The standard specifies the test conditions for horizontal laminar airflow containing sand and dust, including parameters and tolerance requirements such as sand and dust type, concentration, and airflow velocity. It encompasses test procedures for both enclosed and open spaces, and evaluates specimen performance through initial, intermediate, and final inspections.