Salsbury 4B+ vertical and horizontal style commercial mailboxes are ideal for apartments, condominiums and office buildings and are designed for replacement and retrofit installations. Made entirely of aluminum, Salsbury 3500 series 4B+ vertical mailboxes and 3600 series 4B+ horizontal mailboxes are USPS approved and feature a durable powder coated finish.
3500 series 4B+ vertical mailboxes are available as surface mounted or recessed mounted units. Surface mounted units are designed to be mounted on a wall or other flat surface. Recessed mounted units are designed to fit into a rough opening. 3600 series 4B+ horizontal mailboxes are recessed mounted units and are available as front loading units or rear loading units. 3500 and 3600 series 4B+ mailboxes have been U.S.P.S. approved to the required security upgrades of USPS-STD-4B+. 4B+ vertical and horizontal mailboxes are approved for replacement and/or retrofit installations effective October 2006.