Commercial Versatile 4C Mailboxes
Both front loading and rear loading 4C horizontal mailboxes offer secure mail delivery solutions to apartments and multi-unit tenant buildings (commercial and residential) that are under property management and are USPS serviced. The USPS approved 4C mailboxes may be installed inside or outside a building, recessed or surface mounted in a wall, or mounted in a kiosk. Rear loading 4C mailboxes require a secure mailroom for the USPS carrier access to load the mail.
4C Horizontal Mailbox Applications
The United States Postal Service (USPS) has rigid guidelines when it comes to the standards for the construction of these versatile locking commercial 4C mailbox suites. All 4C horizontal mailboxes are extremely rugged and subject to installation requirements for maximum height and distance off the floor.
On October 2006, the USPS-STD-4C was implemented, which applies to all wall mounted commercial mailboxes for centralized mail distribution including those installed in urban and rural settings. Centralized mail delivery systems are highly efficient for mail delivery and collection offering better mail protection and providing easier access for both the tenants and the USPS mail carriers.
USPS Approved 4C Commercial Mailboxes
The MailboxWorks offers several types of USPS approved, pre-configured 4C horizontal mailboxes by Auth Florence Manufacturing. You can mix and match 4C cluster mailbox modules to customize your centralized mail delivery system to meet your project needs.
Auth Florence 4C horizontal mailboxes are simple, easy to use and extremely versatile. They undergo stringent security testing by the USPS and feature thick, vandal proof reinforced mail collection doors with one-piece extruded hinges that are designed to resist prying. They also include standard heavy-duty cam locks and at least one parcel locker for every ten commercial mailbox compartments.
For security and privacy reasons, and to better comply with accessibility regulations, The MailboxWorks also recommends your horizontal mailbox compartments be sequentially numbered.
4C Mailboxes Front Loading
Florence Manufacturing front loading 4C mailboxes feature all new tenant and parcel door sizes plus mail collection, as well as outgoing mail door slot options.
The modular design allows these Auth Florence horizontal mailboxes to be configured with up to 20 tenant doors per module. Plus, individual commercial mailbox compartments can be customized to include single, double, triple, quadruple and quintuple equivalent sized mailbox compartments.
Both front load and rear load 4C horizontal mailboxes are finished with weather resistant powder coating and are available in up to 10 different colors.
Auth Florence 4C cluster mailboxes are simple to customize and there are limitless layout options. You can choose from:
• Five different mailbox door sizes
• Plus 4 optional parcel door sizes
• And five possible outgoing collection box sizes
4C Mailboxes Surface Mounted
If your project doesn’t have the proper wall depth to recess mount your front loading 4C horizontal mailboxes then you can surface mount 4C mailboxes on the wall with a surface mount collar.
Surface mount mailbox collars include mounting hardware with hidden fasteners so your 4C horizontal mailboxes can be installed on any wall with conventional wood studs. Mailbox surface mount collars may also be installed into other surfaces using the appropriate hardware. The collars also feature a powder coat finish to match your 4C mailboxes.
4C Mailbox Installation Requirements
All Auth Florence 4C commercial mailboxes for sale are STD-4C compliant and USPS approved; they meet or exceed the USPS standards. Each state or region may have their own accessibility regulations so The MailboxWorks recommends contacting your local post office to review the location of your new 4C horizontal mailboxes.
If you are unsure of the installation requirements for 4C mailboxes or need help configuring your order for your project, please ask for assistance and one of our commercial mailbox experts would be happy to assist you.
For free 4C horizontal mailboxes layout assistance, simply call us Toll Free at 1-800-824-9985 or complete our online mailbox contact form.
Browse our MailboxWorks Flickr photos for 4C horizontal mailboxes.
Frequently Asked Questions
Who do I contact regarding the placement location of a new or replacement 4C mailbox?
Contact your local postmaster to determine where to install your new mailbox as well as details on what mailbox unit is needed for replacement. Do not contact your local letter carrier.
What is the difference between a recessed 4C mailbox and a surface mount 4C mailbox?
Recessed mount mailboxes are installed into a rough opening in a wall that is made to fit the exact length, width, and depth of the mailbox unit.
Surface mount mailboxes are installed on a flat surface.
Are there USPS regulations about wall or pedestal mount mailboxes?
Please contact your local postmaster to review your specific mailbox installation location needs in order to determine the right option for your application.
I’ve noticed that 4C mailbox units have a longer ship time than CBU mailboxes. Why is that?
4C mailbox units are custom made to order, which requires additional lead time at the manufacturer’s level. CBU mailboxes are pre-made and ready to ship to the buyer as soon as the order is place.
4C Mail Slots
How big is the outgoing mail slot on 4C mailbox units?
The outgoing mail slot is 3/4”H x 12”W.
Does the outgoing mail slot on the 4C mailbox unit offer theft protection?
Yes, there is an aluminum comb on the outgoing mail slot that helps prevent mail fishing and the removal of outgoing mail.
Can I remove the outgoing mail slot?
No. The mail slot and compartment cannot be removed from the 4C mailbox unit.
Can a USPS 4C mailbox be customized with a private mail slot?
No. Only the USPS can place items in 4C mailboxes that are serviced by the USPS. Adding your own private mail slots can compromise the security of the mailbox unit and enable mail fishing.
4C Locks and Keys
I just received my new 4C mailbox but can’t find the keys. Where are they?
Keys for 4C mailboxes with parcel lockers: All 4C mailbox keys, hardware, and installation instructions are in the left side parcel locker. To open, reach into the center of the unit and push up on the bracket located in the upper left corner. This will open the right-side gate and allow you to open the left-side gate and give access to the left side parcel compartment.
Keys for 4C mailboxes without parcel lockers: All 4C mailbox keys, hardware, and installation instructions will be found in one of the tenant door compartments.
NOTE: Before completing the following steps ensure that the 4C unit is securely placed on a flat surface so that it doesn’t fall over when the master front door is open.
How do I get a master door lock for my 4C mailbox?
Once you have installed the mailbox unit contact your local post office to come install the master lock(s) on your new 4C mailbox. This can only be done by the USPS.
4C Mailbox Door Identification
How many characters can be engraved on the mailbox doors?
You can engrave up to 12 characters per line and up to 2 lines.
What size of numbers can be engraved on the mailbox doors?
All engraved characters are ¾” tall.
What size of decals are used for mailbox door identification?
All mailbox door decals are 1 ½” x 1 ¾”.
How many characters fit on a decal?
Up to 5 characters.
4C Parcel Lockers
What is a parcel locker?
Parcel lockers are the part of a 4C mailbox used for package delivery to store oversized packages that do not fit into individual tenant mailbox compartments.
How does package delivery to a parcel locker work?
Should a tenant receive a package that does not fit into their individual tenant mailbox compartment the USPS mail carrier puts a key tag and instructions in the tenant’s mail slot and secures the package in one of the parcel lockers. The key tag and instructions give the tenant/recipient access to the larger parcel locker. All the tenant needs to do is open the corresponding parcel locker with the provided key and remove their package. Once the key is inserted into the parcel locker lock it cannot be removed and stays in place until it is retrieved by the mail carrier.
What is a captive lock?
4C mailboxes have a captive lock on all parcel lockers, which means that once the key is inserted it can only be removed by the authorized mail carrier on their next visit.
Can I use the parcel locker as an extra tenant mailbox?
No. Parcel lockers have a captive lock and do not work the same as tenant mailboxes. Furthermore, the USPS regulation restricts 4C parcel lockers from being removed, changed, or modified for any other purposes other than parcel delivery by the USPS.
Does the USPS require parcel lockers?
Yes, all locations with 10 or more mailbox compartments require a parcel locker. At their discretion, your postmaster may approve a 4C mailbox with no parcel locker in the case that an alternate secure receiving facility is available (such as a separate bank of parcel lockers).
Do all 4C mailboxes come with parcel lockers?
No. There are also 4C mailboxes without parcel lockers for units with less than 10 tenant doors that do not require a parcel locker. Larger 4C mailboxes without parcel lockers are available for locations that have a USPS approved alternate secure receiving facility.
What does Centralized Mail Delivery Mean?
Centralized mail delivery is a form of mail delivery where a local mail carrier delivers and collects mail at one central mailbox unit rather than to each individual residence.
What are the benefits of centralized mail delivery system to 4C mailbox units?
Whether it is a single-family subdivision or a multifamily or office complex, 4C centralized mail delivery improves mail delivery services. Mail is delivered to a convenient central location. USPS mail carriers are able to make multiple deliveries with just one stop, which results in faster service, lower fuel consumption, and lower carbon emissions.
Can 4C mailboxes be used as a Centralized Mail Delivery System?
4C mailboxes are “clustered” style community mailboxes designed for centralized mail delivery. This includes CBU mailboxes (or cluster box units), which are free-standing and mounted on a pedestal, plus other types of STD-4C compliant cluster mailboxes that are mounted on (or in) a wall, a kiosk, or an outdoor mailbox shelter.
Does the 4C mailbox need to be USPS approved?
All centralized mailboxes serviced by the USPS, including 4C mailboxes, must be USPS approved. This means the gang mailboxes have gone through rigorous testing and approval prior to being sold in the marketplace.
Do I need centralized mail delivery?
Check with the local Postal Authorities early in your construction project for your new residential or commercial development. Ask about the mail delivery plan required by the U.S. Postal Service for your planned project.
Do I need a STD-4C compliant mailbox system?
Yes, as of October 5, 2006 all new construction and major renovation projects require the new “4C” postal standard mailbox units that are U.S. Postal Service compliant.
What makes the new STD-4C compliant mailbox system different?
The USPS changed several factors with the new STD-4C compliant mailbox system:
- Mailbox Shape – the traditional cube style mailbox compartments have been updated to flatter style horizontal compartments. The new minimum size requirement is 12′′w × 15′′d × 3′′h.
- Parcel Storage – the new 4C mailbox units incorporate a fully integrated (or stand-alone) parcel locker option. A minimum of one parcel locker per 10 tenant mailbox compartments is required.
- Mailbox Security – the new 4C mailboxes have strengthened security requirements for the entire mailbox receptacle and an improved, standardized tenant mailbox compartment lock design.
- ADA Compliant – the new STD-4C mailbox systems also meet the requirements of the Americans with Disabilities Act (ADA).
Please Explain What the USPS-STD-4B+ Standard Means?
The United States Postal Service (USPS) developed the USPS STD 4B+ standard in an effort to improve mailbox security by strengthening and improving the arrow lock compartment of the mailbox master door. This standard is applied to vertical commercial mailboxes (such as the Florence model 1250), as well as apartment complex mailboxes such as the horizontal style Florence 1400 series mailboxes.
Can I install Standard USPS-STD-4B+?
As of October 2006, 4B+ vertical and 4B+ horizontal mailboxes are only approved for replacement and/or retrofit installations. New construction and major remodels require that Florence Versatile 4C horizontal mailboxes be installed. You can find Florence 4B+ mailboxes here.
How do the new regulations affect what type of centralized mailbox I buy (4C or 4B+)?
Ask yourself these three questions to determine what type of community mailbox system the USPS requires for your project:
- Is the mailbox being used for new construction?
a) If yes, only 4C rated mailboxes or free standing CBU mailboxes must be used.
- If renovating, will the new mailboxes be used as replacements in the same rough opening (RO)?
a) If yes, then 4B+ rated vertical or horizontal mailboxes can be used.
b) If you are adjusting the RO, 4C rated mailboxes must be used.
- Is the community mailbox installation inside or outside?
If installed inside, any community mailbox model can be used depending on your answer to question 1a and 2a/b above.
If installed outside (and unprotected), install 4C mailboxes, as the 4B+ mailboxes are NOT rated for outside use.
How were the USPS standards set?
The United States Postal Service first studied various factors like mail size, the volume of mail received, the mail delivery system efficiency, and other things such as mail theft and vandalism. These factors, along with forecasting the future needs of efficient mail delivery, helped the USPS to create an Apartment Consensus Committee that could review the findings and make more informed decisions about community mailboxes. This committee included representation from mailbox manufacturers like Auth Florence Manufacturing, plus mailbox service providers, resellers, property management companies, and owners, as well as members of the USPS. Following a year of meetings and discussions the committee agreed on a set of new mailbox requirements. These STD-4C regulations are now mandatory for centralized mail delivery systems serviced by the USPS.
What is the purpose of the new 4C standards?
Ultimately, the regulations are designed to improve mail service.
Will mailbox regulations change again soon?
Prior to the October 2006 change in regulation, the USPS last revised mailbox standards in 1975. These previous standards were used for 30 years and were effective for the drastic increases in mail delivery during that period. It is not easy or quick to change mailbox standards and the USPS aims to ensure these new mailbox standards will protect and manage future mail trends.
How can I tell if a mailbox meets USPS requirements?
4C mailbox manufacturer Florence Manufacturing, places a USPS Approved Logo on each mailbox product that meets these STD-4C mailbox requirements. At MailboxWorks, we offer an extensive range of USPS approved community mailbox products. Our customers can shop the versatile 4C mailbox suite collection to mix and match 4C modules for the perfect configuration. Prior to starting, we encourage you to check with your local postmaster about mailbox requirements and any changes to your building’s mail delivery system.
Where is the manufacturer’s name on the mailbox?
You can find the manufacturer name on the front of the mailbox unit, typically on the Outgoing Mail door or in one of the bottom corners.