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Here you will find information regarding USPS Approval for Cluster Mailboxes and centralized mail delivery.
Page Contents
Don't need USPS delivery? Convert to private use.
September 21, 2020
USPS Approved and Ready
CBU's are Pre-approved
Pre-approved by the USPS, cluster mailboxes are considered the industry standard for outdoor, centralized mail delivery.
Installation Location
If you are involved in a new construction development, you have probably already consulted or will consult with your local postmaster regarding the placement (location) of your CBU. If not, we recommend it.
Master Lock Installation
After installing the CBU, follow-up with your local post office and the USPS will install their master lock for the main access door. Note: the USPS provides the master lock and only they have the keys to it.
New USPS Standard
Obsolete: NDCBUs are no longer permitted for replacement or new installations
New CBUs accommodate both mail and packages while providing greater security.
Developed and approved by the USPS in 2005, the new cluster box unit specification (right image) became the standard for all manufacturers and replaces both the outdated Neighborhood Delivery Collection Box Unit (NDCBU) and the "E" series CBU.
While the original NDCBU introduced convenience for residents and letter carriers alike, it is no longer permitted for replacement or new installations. These outdated units fall into disrepair as they age and are, in many cases, quite dilapidated. The newer 2005 specifications boast a thoroughly tested design that provides better security and durability over time.
Don't need USPS delivery? Convert to private use.
If you don't need USPS delivery, you need the Postal to Private Conversion Kit, which can be purchased via the dropdown options section of any CBU. Purchase the Private Conversion Kit only if you intend to use the CBU for private use. Your company or organization will need access to open the master door for delivery.
Under the Option labeled "Will the USPS be delivering to this mailbox?", select "No, this box is for private use...". Private delivery CBUs are typical where mail delivery is handled by private distribution within the company or organization.
Need more info? We have a full page with detailed instructions for converting a USPS cluster mailbox to private delivery.
Who has a USPS License to manufacture CBUs?
Florence Mailboxes was founded in 1934 while Salsbury Industries began in 1936. Both have the exclusive license from the USPS to manufacture Cluster Box Units (CBUs) in the USA. CBUs from both manufacturers are relatively identical in both design and quality.
Where are they different?- Pricing - Salsbury Industries CBUs tend to have higher prices.
- Lead times - Florence CBUs typically ship in 1-3 weeks while Salsbury CBUs tend to ship quicker in about 3-5 business days.
- Finishes - Florence offers CBUs in four architectural finishes: Sandstone, Postal Grey, Bronze, and Black. Salsbury offers these four finishes as well as White and Green.
- Options - While Florence Mailboxes CBUs can be purchased without pedestals (reducing the price), the Salsbury CBU can only be purchased with the included pedestal.
While pricing, lead time, finishes, and options are similar, they are not the same between the factories.
For example, sometimes Salsbury ships CBUs faster than Florence (or vice versa). Also, the manufacturer controls their own pricing, so often one brand may cost more than the other.
BudgetMailboxes has you covered. We keep it simple. We sell you the CBU from the manufacturer that is the cheapest and we give you transparent, up-to-date lead times once your order is placed.
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