Florence Mailboxes: CBU, 4C & Commercial Units

Why Buy Florence Mailboxes From an Authorized Dealer

The best place to buy Florence mailboxes is through an authorized Florence dealer. Florence Corporation doesn't sell direct: every unit in the catalog moves through an authorized dealer network, and the 5-year Florence mailboxes warranty is tied to that authorization. Florence only honors the warranty on units purchased through an authorized dealer. Buy from an unauthorized reseller and the warranty is void. Any replacement cost falls on the buyer.

Budget Mailboxes is an authorized Florence dealer for the complete lineup: CBUs, 4C horizontal mailboxes, 4B horizontal mailboxes, vertical mailboxes, and parts. The Florence warranty transfers intact on every order . Our authorized status also means direct access to accurate factory lead-time data, current configuration options, and custom color availability, details unauthorized sellers typically can't confirm.

Practical benefits of ordering through Budget Mailboxes: bulk pricing on orders of two or more units, free shipping over $99, factory-direct ship from Manhattan, Kansas, and phone support at 1-866-707-0008 for specification questions before you commit.

Florence Mailbox Product Families at a Glance

Florence makes four distinct product families, and the right choice depends on two things: whether your installation is USPS-delivery or private-delivery, and whether you're building new or retrofitting an existing system. This table maps the decision criteria buyers use most: project type, approval status, mounting, and door count. Use it to shortlist before you start filtering.

Florence CBU mailboxes and Florence 4C mailboxes cover the full range of new-construction centralized delivery; outdoor pedestal installs and indoor wall-mounted systems respectively. Florence cluster mailboxes (CBUs) and 4B or vertical units serve different use cases entirely: CBUs for current outdoor USPS delivery, 4B and vertical only where a one-for-one replacement qualifies. Florence doesn't make single-residence curbside mailboxes. This entire catalog is centralized delivery for community mailboxes in apartment buildings, condominiums, office parks, dormitories, military housing, and HOA developments.

Florence Cluster Mailboxes (CBUs)

A Florence CBU is a pedestal-mounted, outdoor centralized mail delivery unit approved by USPS for new construction and multi-family installations. Florence Corporation's 1570 series CBUs meet or exceed USPS security standards, with individual keyed tenant compartments, integrated parcel lockers, and a carrier master door that operates on the USPS Postal Master Lock (Arrow lock) system. Available in 4, 8, 12, 13, and 16-door configurations.

Auth Florence cluster mailboxes are built for outdoor deployment without a wall opening or interior mailroom. The carrier delivers to all compartments in a single stop at the pedestal location. Each unit includes an outgoing mail slot with an anti-fish comb that prevents deposited mail from being retrieved, and a key-trapping mechanism that holds the carrier's master key in the lock while the master door is open. Parcel locker integration is standard: 1–2 lockers on most configurations, up to 4 on the 8-door unit.

Florence CBU mailboxes carry the 5-year Florence Corporation limited warranty on units purchased through an authorized dealer. Six standard architectural powder-coat colors are available: Sandstone, Black, Bronze, Gray, Green, and White.

For high-risk or vandalism-prone locations, Florence offers a high-security CBU with reinforced construction designed to resist mail theft and vandalism. The full range of Florence cluster mailboxes is available through Budget Mailboxes, including the 4-door Florence CBU and larger configurations up to 16 doors.

Florence 4C Horizontal Mailboxes

The 4C horizontal mailbox is the current USPS standard for wall-mounted centralized delivery in new construction and major renovations, fully required since October 6, 2006. Florence 4C mailboxes are used by multi-family developers, property managers, and HOA boards nationwide. If you're building new and USPS will be delivering, you need a 4C. Florence 4C horizontal mailboxes are available in the full range of configurations and colors through Budget Mailboxes.

Tenant compartment minimum dimensions are 12"W x 15"D x 3"H per USPS STD-4C. Parcel lockers must be integrated at a minimum ratio of 1 locker per 5 tenant compartments. ADA reach ranges apply to all installations: the top tenant lock must be no higher than 48" above finished floor, and the bottom lock no lower than 15" (or 28" where the bottom row is the only row accessible from the side). Apartment mailboxes with Florence 4C installations support the widest range of module configurations and both horizontal and vertical combination layouts.

Mounting Styles: Recessed, Surface Mount, and Free-Standing Depot

Mounting style determines USPS approval status. The three valid options for Florence 4C:

• Recessed mount (framed wall opening): the only mounting style approved for USPS mail delivery. Requires a correctly dimensioned rough-opening depth for the chosen module configuration. Standard for new construction. Recessed 4C mailboxes include all hardware for framed-opening installs.

• Florence 4C surface mount with collar: private-delivery only. USPS will not deliver to surface-mounted 4C units. Common in secure residential buildings, university residence halls, and office parks with internal mail distribution. The Florence 4C surface mount collar mounts directly to the wall with no wall cut required.

• Florence 4C depot (free-standing cabinet): private-delivery only, used where wall mounting isn't feasible.

Local postmaster approval is required before any USPS-delivery installation, regardless of configuration.

Color and Finish Options (Eight-Color Powder-Coat Palette)

Florence 4C mailboxes are available in eight architectural powder-coat colors: Antique Bronze, Black, Dark Bronze, Gold Speck, Postal Grey, Sandstone, Silver Speck, and White. Having eight color options matters for projects with specific exterior or interior finish requirements, giving specifiers and developers more flexibility to match building aesthetics.

Color is selected at order time, and most options are built-to-order configurations. Powder-coat finish meets STD-4C corrosion and weather-resistance requirements.

Florence 4B and Vertical Mailboxes (Replacement Installs)

4B mailboxes are still allowed, but only for direct one-for-one replacement. USPS no longer approves Florence 4B mailboxes or Florence vertical mailboxes for new construction. Both product lines are restricted to replacing an existing approved unit of the same type in buildings where that system is already installed and postmaster-approved.

The replacement rule has a hard boundary: if anything changes beyond a straight swap, the project no longer qualifies. Adding compartments, modifying the rough opening, or relocating the mailroom all trigger a USPS requirement to upgrade to 4C. If you're unsure whether your project qualifies, contact your local postmaster before ordering.

Florence's 1250 vertical series mailboxes are available in 3–7 door configurations, recessed or surface mount, with each compartment measuring 15"W x 19"H x 6-3/4"D. These units ship from the Florence factory in Manhattan, Kansas. For projects that qualify, Florence 4B horizontal mailboxes and replacement community mailboxes are available through Budget Mailboxes with the full authorized-dealer warranty pass-through.

Local postmaster approval is required before purchase for any USPS-delivery replacement installation.

STD-4C Compliance: What Florence's Engineering Guarantees

USPS STD-4C is the technical standard that governs every wall-mounted centralized mailbox installed in new construction or major renovations since October 6, 2006. Auth Florence mailboxes are built to this standard: Florence served on the USPS consensus committee that developed STD-4C, which is why every USPS-approved Florence mailbox ships in compliance without requiring field modification.

The 4C horizontal mailboxes overview provides additional installation context. Here are the specifications USPS STD-4C mandates and Florence's products meet:

• Tenant compartment minimum: 12"W x 15"D x 3"H

• Parcel locker integration: 1 parcel locker per 5 tenant compartments (minimum)

• Construction: heavy-gauge aluminum, 300-series stainless steel hardware

• Finish: powder-coat corrosion and weather resistance

• Arrow lock height: between 36" and 48" above finished floor

• ADA reach ranges: top tenant lock no higher than 48" above finished floor; bottom lock no lower than 15" (or 28" where bottom row is the only row accessible from the side)

Florence also holds ISO 9001:2015 and ISO 14001:2015 certification: the only centralized-mailbox manufacturer with both. That distinction matters for architects and specifiers who need to document manufacturer credentials as part of project submissions.

Bulk Pricing and Project Support

Budget Mailboxes offers bulk pricing on Florence mailboxes for orders of two or more units. In-stock configurations ship in 3–5 business days from the Florence factory in Manhattan, Kansas. Built-to-order configurations (custom door counts, specific color builds, or multi-building projects) run 2–4 weeks from order confirmation.

Custom configurations are available across Florence's 4C horizontal mailbox line. Shop drawings for USPS approval documentation or architect review are available on request at no charge.

For customer service or project quotes, call 1-866-707-0008 or request a bulk quote with your unit count, configuration, and color selections. Our team handles projects from a single CBU to full multi-building installs.