STD-4B+ Horizontal Mailboxes

Made entirely of aluminum, 3600 series USPS approved (for renovations) 4B+ standard horizontal commercial mailboxes are available as Front or rear loading units. A front loading door panel swings on a continuous hinge. One mailbox opening is required for a master postal or commercial lock and cannot be used for mail distribution.

3600 series 4B+ standard horizontal commercial mailboxes have been U.S.P.S. approved to the required security upgrades of USPS-STD-4B+. These mailboxes are approved for replacement and/or retrofit installations effective October 2006. For new construction installations, see our 4C horizontal mailboxes.