Drawing makeup air from rainscreen cavity

Wondering if anybody can think of some risks/downsides to pulling air from the rainscreen cavity so that the vent does not penetrate the siding. Specifically thinking of doing this for… Wondering if anybody can think of some risks/downsides to pulling air from the rainscreen cavity so that the vent does not penetrate the siding. Specifically thinking of doing this for…Read MoreGreenBuildingAdvisor