Commercial Mailbox Guide for New Buyers

August 11, 2017 3:15 pm by

Commercial mailboxes are uniquely designed to accommodate centralized mail distribution systems in business, educational, and commercial settings.

If you are a developer, project manager, businessperson, or university campus director who has yet to make a commercial mailbox purchase, or if it has been awhile, the following overview will serve as a helpful guide to the most common commercial mailboxes and their applications including:

  • CBU Cluster Mailbox
  • 4C Horizontal Mailbox
  • 4B+ Replacement Mailbox
  • Private Distribution Mailbox
  • Pedestal Commercial Mailboxes
  • Commercial Vertical Mailbox

Florence 8 Door Bronze Traditional CBUCBU Cluster Mailboxes

Some of the most commonly utilized commercial mailboxes are CBU mailboxes or cluster mailbox units. These commercial gang mailboxes are available as 4, 8, 12, 13, and 16 tenant door units and are usually installed on a pedestal. Pedestal cluster mailboxes can be installed in virtually any outdoor location, pending approval from your local postmaster. They are also available in four color finishes and come with either engraved tenant door identifications or decaled identifications. Contact The MailboxWorks if you should require professional installation services for your new CBU commercial mailboxes.

4C Horizontal Mailboxes

For indoor installations, versatile 4C mailboxes are the most popular, which are available in configurations that range from one tenant door up to twenty-nine tenant doors. Versatile 4C horizontal mailboxes may be recessed into the wall or surface mounted onto a wall and are available in eight color finishes. Integrated collection boxes, drop boxes, and trash and recycling bins may also be ordered as part of your new 4C commercial mailbox system.

Florence 1400 Postal Horizontal Commercial Mailboxes4B+ Replacement Mailboxes

Authorized by the United States Postal Service (USPS) for replacement use only (in minor renovation projects), 4B+ replacement mailboxes are available in various configurations. They can be ordered with as few as ten tenant doors or up to thirty-five tenant doors. Florence Manufacturing’s 4B+ commercial mailboxes come in a standard aluminum anodized finish but for an additional fee, they can also be upgraded to one of nine beautiful color finishes. Tenant doors can be specified to arrive with engraved numbering (matching the number of doors), custom numbering, or simply left blank. The 4B+ replacement mailboxes are designed for indoor use only unless located in a covered hallway where these commercial mailboxes can be protected from the elements.

Private Distribution Mailboxes

Designed as a centralized mail delivery system for private mail distribution, these commercial mailboxes are not serviced by the United State Postal Service. Instead, the mail is distributed privately and the units can be ordered with a pre-installed private master lock on the master door. Private distribution mailboxes can also be ordered as either front loading or rear loading horizontal mailbox units (4C horizontal mailboxes). These are ideal for private business installations or for use in universities, hospitals, and medical or military complexes that are not serviced by the USPS.

Pedestal Commercial Mailboxes

These are USPS approved outdoor pedestal cluster mailboxes, which are also known as 4C pedestal mailboxes and manufactured by Florence Manufacturing. They come in a wide range of sizes and configurations and can be ordered with up to 29 tenant doors and with or without a parcel locker or a collection drop box. Pedestal commercial mailboxes can also be used for a variety of purposes including for package deliveries, key drops, library book returns, and much more. They are also protected with a corrosion resistant weatherproofing to ensure years of reliable outdoor use.

Florence Vertical MailboxesCommercial Vertical Mailboxes

Vertical mailboxes are designed to be mounted indoors and can be inserted into the wall or surface mounted as required. These are designed as replacement vertical mailboxes for multi-tenant complexes that are experiencing only minor renovations. For major renovations or new construction projects, USPS regulations dictate that 4C horizontal mailboxes must be used.


While this is not an exhaustive list of available commercial mailboxes, the mailbox experts at The MailboxWorks hopes that this commercial mailboxes guide will help you in your decision making.

If you need assistance ordering commercial mailboxes online, please contact our office toll free at 1-800-824-9985 or send us an email.

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