Wind classification of site and or product to AS1170.2, AS4055. The assessment is done using the wind loading code AS1170.2, then a wind class from AS4055 is assigned. Two wind classes are identified an upper and lower. The upper wind class is for sites, whilst the lower wind class is for manufactured structural products (MSP) designed to AS1170.2. Typically if an MSP is designed to AS1170.2 then the site needs assessing to AS1170.2 not AS4055.
Site address. Photos looking north, east, south and west are also useful.