Horizontal Mailboxes - USPS Approved 4C & 4B Mailboxes

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Horizontal Mailboxes – USPS-Approved 4C & 4B Mailboxes

In October 2006, USPS updated its standards for commercial mailboxes. These changes apply to any mounted or recessed 4C horizontal mailbox and 4B horizontal mailbox. Following the new standards for USPS-approved mailboxes ensures compliant devices, as well as improved size and security.

4C Mailbox Design and Dimensions

All 4C horizontal mailboxes must have stainless steel components for the doors and locks. The durable exterior makes these USPS-approved parcel lockers perfect for outdoor and indoor use. At lowpriceclustermailboxes.com, our mailboxes from Florence Mailboxes and Salsbury Industries come in several colors, so you can find something that matches your surrounding aesthetics.

Each 4C door has the following dimensions: 3” x 12” x 15”. The tenant door locks utilize stainless steel and dustproofing, while the exterior has a door identification placard that the local postmaster can read easily. The horizontal mailboxes also feature a drop-off slot that lets tenants leave outgoing packages inside mailbox units.

4B Mailbox Design and Dimensions

USPS has phased out 4B horizontal mailboxes in favor of the more robust and secure 4C model. The 4B series has weaker locks and small parcel lockers. It doesn’t give tenants as much space for incoming U.S. mail, either.

The shift away from 4B recessed and wall mount mailboxes started in 2006. Any multi-unit building with a 4B mailbox built after Oct. 6, 2006, is approved for replacement. Multi-unit buildings constructed before then can replace the existing model with a new 4B mailbox.

Front-Loading Wall Mount

At lowpriceclustermailboxes.com, we have a wide selection of horizontal mailboxes from Salsbury Industries and Florence Mailboxes. We have dozens of preconfigured options designed to meet the latest USPS standards and specifications. Our front-loading horizontal wall mailboxes come with master loading doors so that mail carriers can access every compartment at once.

Front-loading models are popular in dorms, business mailrooms, and apartment buildings. Mail carriers can deliver items through the front of the locker as opposed to the back. The design ensures a straightforward mail delivery system.

Rear-Loading Wall Mount

Rear-loading wall mount mailboxes have a door that opens from the back. Mail carriers have to go into a separate room to retrieve outgoing mail from recessed units. The hinged and latching rear doors ensure a secure locker at all times.

A rear-loading unit works best for speedy and secure mail delivery. The series does not have a locking mechanism, unlike the front-loading lockers that require two keys. The business must have a secure mail room for mail carriers to drop off packages to make these models viable.

ADA Requirements for Mail Delivery

All wall-mounted mailboxes must meet ADA guidelines. These rules ensure that Americans of all ability levels can access their mail. Accessibility regulations can depend on your city and state, so consult local building ordinances if you have mailboxes approved for replacement.

For example, front-loading horizontal mailboxes must have a minimum height of 28 inches above a finished floor. If the series doesn’t contain parcel compartments in the bottom row, the minimum height drops to 15 inches. Visit the USPS website for more information about ADA compliance.

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