Which Mounting Style? Copperlab's vents come in two different mounting styles.  The flush mount should be purchased if the siding of your building is already installed, or if your building is brick or stone.  The stucco mount model has a flashing is meant to be installed prior to the siding installation.  This mount can best be used with stucco, or wood / vinyl siding (stucco mount vents must be installed underneath siding and water-proofing).