4C Horizontal Mailboxes - Multi Tenant

Manufacturers build 4C mailboxes as centralized mail delivery systems that meet USPS STD-4C standards. Developers install these systems in new construction and major renovation projects that require centralized mail delivery. These mailboxes are most commonly used in multi-tenant and commercial settings. USPS STD-4C standards apply nationwide, but local postmasters control final delivery approval. Always confirm requirements before installation.

Manufacturers offer horizontal 4C mailboxes in recessed, surface mounted, and free-standing configurations. Developers select the mounting style based on building layout and delivery requirements. Mounting style determines whether USPS approves the installation. Developers use recessed systems for USPS delivery and reserve surface or free-standing systems for private delivery.

Recessed mounted units install flush within a framed wall opening. Developers and contractors select this option during new construction or major renovation projects. Manufacturers design recessed 4C mailboxes to meet USPS STD-4C specifications for centralized delivery. Local postmaster approval is still required before activation.


 ! USPS APPROVED WHEN INSTALLED PER STD-4C AND CONFIRMED BY THE LOCAL POSTMASTER

Surface mounted 4C mailboxes attach directly to the wall surface and typically include a matching enclosure. Property managers and building owners use surface mounted units when USPS delivery is not required.

 ! NOT USPS APPROVED – PRIVATE DELIVERY ONLY

USPS carriers do not deliver mail to surface mounted 4C mailboxes. Always confirm delivery requirements before  selecting this option.

Free-standing 4C horizontal mailboxes are housed in a Free Standing Depot Cabinet and are used in spaces where wall mounting is not possible. Facilities use free-standing units for controlled-access environments with internal or private delivery systems.

 ! NOT USPS APPROVED – PRIVATE DELIVERY ONLY

Buildings that require USPS delivery should select recessed mounted systems instead.

4C mailbox systems support either USPS delivery or private delivery, depending on the mounting style and building requirements. Developers select recessed mounted 4C mailboxes when USPS delivery is required. USPS installs and controls the Arrow lock, and the local postmaster must approve the installation before mail service begins.

Property managers select surface mounted or free-standing 4C mailboxes when private carriers or internal staff handle mail delivery. USPS does not deliver to these configurations.

Developers should select a configuration that meets current tenant needs and allows for future growth.

Manufacturers build 4C horizontal mailboxes for daily use in high-traffic environments. Most systems are constructed using
heavy-duty aluminum with reinforced doors and hardware, making them suitable for daily use in busy, multi-tenant environments.

When comparing finishes and security features, buyers often look for the following:

O   Powder-coated finishes available in standard or expanded color options to help match the building’s overall design
O   Stainless steel hardware that resists rust and wear over time
O   Anti-fish plates designed to reduce mail theft between adjacent compartments
O   Secure cam locks on tenant doors to limit access to authorized key holders
O   Outgoing mail compartments with protective flaps, where applicable, to help shield mail from weather and unauthorized access

Plan installation early to avoid delays and ensure the mailbox system integrates smoothly into the building design.

4C Horizontal Mailboxes are perfect for apartments, condos, office buildings, military bases, and residential developments. Made entirely of aluminum, they are USPS-Approved and come in both front and rear loading options. These 4C units and parcel lockers comply with USPS-STD-4C specifications and are mandatory for new construction and major renovations since October 2006.