Simulated tile vents are made with a backer board. The preffered method of installation is for the backer board and vent to be installed prior to the stucco lath. Fasten the backer board to solid framing members, with an adequate number of mechanicalfasteners penetrating a minimum of 1" into solid backing. The lathing contractor must inter-weave the lath paper and flashing around the backer board, creating a water-tight system. The wire and stucco will cover the backer board leaving the tile.