Salsbury horizontal style commercial mailboxes are ideal for student housing, military bases, assisted living facilities, office buildings and other centralized mail delivery applications. Salsbury 3700 series 4C horizontal mailboxes and 3600 series 4B+ horizontal mailboxes are constructed of aluminum and available as front loading units or rear loading units.

Salsbury 3700 series 4C horizontal mailboxes are available with standard MB1 mailbox doors and larger MB2 and MB3 mailbox doors. 4C horizontal mailboxes are available in a variety of configurations up to 28 doors per unit. The 3600 series 4B+ horizontal mailboxes are available with standard A doors and larger B doors. 4B+ horizontal mailboxes are available in configurations up to 35 doors per unit.