You can have different exposures in the same city. Building departments will calculate the span by different exposures for the same wind even if it’s in the same wind and snow load area. For example, a louvered roof system that will be installed in a 90 mph with 10 Psf. snow load in an urban area will have less exposure than the same patio cover with the same load in a rural area. The exposure can also address the height of the louvered roof system. There will be different exposure for a louvered roof system that is installed on a ground floor than at the penthouse 4 or 5 stories high. Commercial and residential louvered roof systems will also have different exposure, although they’re in the same exact location. Our louvered roof system’s generic engineering will cover exposure A and B and in most building departments you will just need to increase the loads to permit your louvered roof system in exposure C.