System Sensor MWBBW Metal Outdoor Back Box White
Overview
The System Sensor MWBBW is a white metal outdoor back box rated NEMA 4X for weatherproof mounting of SpectrAlert Advance horns, strobes, horn strobes, and chime strobes in exterior environments. Designed for wall or ceiling installation on masonry, brick, concrete, and ceramic tile, the MWBBW provides durable metal housing that resists corrosion and UV exposure typical of outdoor duty. This back box enables secure equipment mounting where fire alarm and building communication devices require environmental protection and reliable housing integrity.
Compatibility
The MWBBW accommodates System Sensor SpectrAlert Advance outdoor devices, including horns, strobes, horn strobes, chime strobes, and speakers. It pairs with System Sensor mounting plates and universal mounting hardware to support 4-wire device configurations. The box is compatible with trim rings for horns and strobes, allowing efficient use of single-gang backbox space. Verify your specific SpectrAlert Advance model number against System Sensor product documentation to confirm mounting compatibility.
Installation Notes
Operating temperature range is −35°F to 151°F, defining suitability for climate zones. The NEMA 4X rating confirms protection against external ice and snow accumulation. Metal construction requires standard fastening hardware appropriate to your wall substrate (masonry anchors for brick or concrete, standard wall anchors for tile). Flush mounting design reduces protrusion and wind load. No electrical wiring or power termination occurs inside the back box itself — the MWBBW is a structural housing only and must be paired with appropriate powered mounting plates (such as the System Sensor MP120K, which converts 120 VAC to 24 V FWR for connected devices).
