Southwire CMB218WB Fan Support Box Old Work 8 Pack

Product Description

The SOUTHWIRE CMB218WB is a fan support box with adjustable brace designed for old-work electrical installations. This unit provides a secure, ceiling-mounted enclosure for ceiling fans and light fixtures in finished spaces where wall or ceiling surfaces are already in place. The box is 2.125 inches deep, giving adequate room for wiring connections. It ships as an 8-pack, making it a practical choice for electricians and contractors working across multiple installation points on a single job. The integrated brace adjusts to fit between ceiling joists without requiring access from above, which is the defining advantage for retrofit and remodel work.

This product is suited for residential and light commercial retrofit projects where ceiling fan or fixture boxes need to be installed or replaced without opening up the ceiling. Typical applications include remodeling jobs, tenant improvement work, and service calls where a listed fan-rated box is required in an existing finished ceiling. Electricians working service and remodel runs will find the 8-pack format efficient for stocking a van or staging a multi-room project.

Key Features

• Old-work design installs through existing ceiling cutout without attic or above-ceiling access
• 2.125-inch box depth accommodates standard wiring connections for ceiling fans and fixtures
• Adjustable brace spans between ceiling joists to provide solid fan-rated support
• 8-pack quantity reduces per-unit cost for multi-fixture jobs
• Fan-rated construction supports ceiling fan installations where dynamic load is present

Compatibility

Designed as an OEM-style replacement and new-installation solution for old-work ceiling fan and light fixture box applications in standard residential and light commercial finished ceilings.

Installation Notes

Installation is performed by a licensed electrician in accordance with NEC Article 314 requirements for outlet box support and fan-rated applications. Always shut off the branch circuit at the panel and verify absence of voltage before beginning work. The adjustable brace is inserted through the ceiling cutout and expanded to bear against ceiling joists on both sides before securing. Do not exceed the box weight and dynamic load ratings for the ceiling fan or fixture being supported.

Technical Specifications

• Box Depth: 2.125 inches
• Installation Type: Old Work (Retrofit)
• Quantity per Pack: 8
• UPC: 751338871847

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: CMB218WB