Southwire MSBFAN Fan Support 50/ lb, Maximum with Depth Adjustable, gray SMART BOX FAN FIXTURE BOXESMounts light fixtures, fans (MSBFAN only), smoke and carbon monoxide detectors. Quicker to install than a nail on box. Easily removed without creating damage to wall. Extra thick wall material creates stability and rigidity. Best solution for old work and retrofit applications. Heavy duty design for support of moving loads. Extra deep for smoke and carbon monoxide detectors or paddle fan components.Madison Electric is now part of the Southwire family. Product packaging may vary. Features Depth Adjustable Quicker to install than a nail on box Extra thick wall material creates stability and rigidity Easily removed without creating damage to wall UL Listed; Madison Electric is now part of the Southwire family; Product packaging may vary USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.