Louvers approved for extreme standards will indicate which tests and certifications they have undergone to back up their claims. Be sure the claims include certification numbers from credible testing agencies for validation.For example, a hurricane louver may list both Miami-Dade County NOA and Florida Product Approval certification numbers based on testing from third parties. Test standards are developed by organizations like AMCA and ATSM International, and tests are conducted by trusted entities like AMCA and Intertek. Some local and regional building codes require compliance to select standards.Remember that some standards define performance requirements while others describe test procedures. Here are some common standards that apply to extreme weather louvers: