Shop for housings used for intercom systems. Master wall housings are generally sold in kits that include antennas, mounting hardware and transformer. They can be installed in new and existing construction and used as replacements for old housings when a system is upgraded. Two types of housings are used to mount intercom and door speakers - recessed (flush) and surface. Recessed housings are typically used to mount intercom speakers inside the house and outside speakers installed in new construction. Surface housings are typically used for outside speakers installed as retrofits. They can also be used for new construction. We carry housings for Intrasonic, M&S and Nutone intercom systems.