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4B+ Front-Loading Horizontal Mailboxes - 11 Tenant Doors

(View all from 4B Mailboxes)
SKU: WL-4B140062ABM  |  View All 4B Mailboxes - A Sized Doors
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$130.00 (20%)

Volume Discount Pricing
2 - 5$487.50
6+ $463.17
This is a custom manufactured unit. As such, it is not returnable. Not USPS Approved or for New Construction Use. For Private Use or Replacement Purposes only. We strongly advise you discuss the installation with your local Post Master prior to purchase.
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Door ID Layout*

Door Identification*

According to manufacturer:
Anodized Finish with Standard Numbering: Usually ships in 2 weeks
All other finishes or with Custom Numbering: Usually ships in 4 weeks
Ships directly from the factory floor to ensure the quickest available delivery.

Understanding Replacement and Private Delivery Mailboxes

Like many customers, you may have questions about the difference between USPS and Private Delivery. U.S. Postal Delivery is when the USPS Letter Carrier delivers mail to each existing tenant compartment in a cluster mailbox. Private delivery is when the letter carrier drops all the mail at one location and in-house personnel distributes the mail.

Due to changes in postal regulations, you may only use these older 4B horizontal mailboxes to replace a current installation of similar mailboxes without modifying the existing wall opening. However, if you do intend to modify the rough opening dimensions during a replacement or remodel, or if you plan to install for new construction, 4C mailboxes will be required.

If you need a large number of mailboxes but have limited wall space, horizontal mailboxes are an economical solution. Because these mailboxes are designed to meet specifications 30+ years old, they should only be installed indoors as they do not include the same weather resistant features or security features as the current 4C mailboxes.

Standard Series

for Postal Delivery

Door Sizes

Standard horizontal mailboxes are pre-configured with the following door sizes:

    Tenant Compartments

  • 1H x 1W

  • 1H x 2W

  • Collection Compartment

    2H x 2W

  • Parcel Locker Compartments

    2H x 2W

    3H x 2W

As an indoor solution, these traditional-style mailboxes are most popular in apartment complexes, and university/military housing. The standard for decades, these are available as replacement units for worn out installations. (All new construction must use the new postal STD-4C mailboxes.)

Standard Features

  • Front load
  • Recess-mounted
  • Prepared for USPS installed Master Lock
  • Anodized aluminum finish
  • 5-pin cylinder tenant cam lock with two keys (1,000 key changes)
  • Clear plastic number slots or engraved numbers
  • Snap-on outer trim kit (available by request)

Plastic Number Slot:
Number slots are 5/8 in. H x 2 in. W.

Engraving: Custom engraving utilizes the USPS Standard US Block font and is 3/4 in. tall. All engraving can include up to 12 characters per line, two lines per door.

If your installation needs a little more customization than available on the standard series, select the custom series to swap doors and lock types.

Note: Horizontal mailbox installations should be protected from direct exposure to the weather.


Actual: 28 in. H / Rough Opening: 28-1/4 in. H

Model 4B140052A* 4B140053A* 4B140054A* 4B140055A* 4B140054DA 4B140054PLA 4B140055PLA 4B140055OUA
# Mailboxes (Total)9141924902020
# Parcel Lockers (Total)00000410
# Collection00000001
Actual Width14-3/8 in.20-3/4 in.27-1/4 in.33-5/8 in.27-1/4 in.27-1/4 in.33-5/8 in.33-5/8 in.
Rough Opening Width14-5/8 in.21 in.27-1/2 in.33-7/8 in.27-1/2 in.27-1/2 in.33-7/8 in.33-7/8 in.


Actual: 33-3/8 in. H / Rough Opening: 33-5/8 in. H

Model 4B140062A* 4B140063A* 4B140064A* 4B140065A* 4B140064DA 4B140064PLA 4B140065PLA 4B140065OUA
# Mailboxes (Total)111723291102525
# Parcel Lockers (Total)00000610
# Collection00000001
Actual Width14-3/8 in.20-3/4 in.27-1/4 in.33-5/8 in.27-1/4 in.27-1/4 in.33-5/8 in.33-5/8 in.
Rough Opening Width14-5/8 in.21 in.27-1/2 in.33-7/8 in.27-1/2 in.27-1/2 in.33-7/8 in.33-7/8 in.


Actual: 38-3/4 in. H / Rough Opening: 39 in. H

Model 4B140072A* 4B140073A* 4B140074A* 4B140075A* 4B140074DA 4B140074PLA 4B140075PLA 4B140075OUA
# Mailboxes (Total)132027341303030
# Parcel Lockers (Total)00000610
# Collection00000001
Actual Width14-3/8 in.20-3/4 in.27-1/4 in.33-5/8 in.27-1/4 in.27-1/4 in.33-5/8 in.33-5/8 in.
Rough Opening Width14-5/8 in.21 in.27-1/2 in.33-7/8 in.27-1/2 in.27-1/2 in.33-7/8 in.33-7/8 in.


Standard modules noted with an asterisk (*) are fully configurable.

All model numbers listed are for standard front-loadmodules; add -SP for custom modules at the end of the number.

Custom Series

for Postal or Private Delivery

Providing an opportunity for greater flexibility in door size and type selection, the Custom Series allows you to upgrade your horizontal mailboxes to fit your installation needs. This configurable solution lets you be the designer as you place the doors where you want them instead of being tied to a pre-determined standard module -- for customization options, please call us at (866) 707-0008.

Optional Features

  • Private master lock
  • Eight powder coat color finishes
  • Combination lock (for private services only)
  • Configurable door sizes and layout options

Color Options

Anodized Aluminum is standard for
all horizontal mailboxes. Upgrade
your installation to one of three
different architectural color options,
all in a durable, powder coat finish.

  • Dark Bronze (DB)
    PMS Black 7C
  • Gold Speck (GS) PMS 7-5C

Configurable Modules

Sometimes a standard sized compartment is simply not big enough to suit your residents' needs. That's why you can change mail compartment sizes or add as many collection or parcel lockers as your installation requires. Simply begin with an all tenant standard module, and modify it by placing any of the various door sizes and types found in the chart below.

Door Sizes

Configurable units available in cabinet sizes 2 - 5 Wide and 5 - 7 High.

Parcel Locker
One-High, One-Wide
(5 in. H x 6-3/8 in. W)
Tenant Compartments
Collection CompartmentsNOTE: Collection compartments are available with or without an access lock.
One-High, Two-Wide
(5 in. H x 12-7/8 in. W)
Tenant CompartmentsCollection Compartments
Two-High, Two-Wide
(10-3/8 in. H x 12-7/8 in. W)
Tenant CompartmentsCollection CompartmentsCollection Compartments
Three-High, Two-Wide
(15-3/4 in. H x 12-7/8 in. W)
Tenant CompartmentsCollection CompartmentsCollection Compartments
16 Door CBU

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  • Reliable on-time shipping
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What does this mean for you?

We will promptly assist customers in the event that they are unsatisfied with their purchase, and we will make every effort to resolve support cases with the customer directly.

So, think of the Google Trusted Stores stamp as more than just a marketing icon. It's the assurance that we will go the extra mile to resolve your support case, according to our company policies.

16 Door CBU
For Your Reference:

OUR SKU is 4B Mailboxes 4B140062A

Dimensions & Weight
Ship Weight:
4B+ Front-Loading Horizontal Mailboxes - 11 Tenant Doors
33-5/8 in. H x 14-5/8 in. W x 17 in. D
36.00 lbs
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Frequently Asked Questions

4B+ Front-Loading Horizontal Mailboxes - 11 Tenant Doors
Shipping Information:

Shipping Estimate:

Anodized Finish with Standard Numbering: Usually ships in 2 weeks
All other finishes or with Custom Numbering: Usually ships in 4 weeks

Stock Status:

In Stock

Ships to:

Ship Method:

FedEx/UPS (Learn More)

Shipping Policy:

Return Policy:

Return Instructions:

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Regarding a Product's Shipping Estimate

Understanding Lead Times

The lead times listed on this product page represent the best-case scenario for shipping estimates. While we may show that a product "usually ships" within a given period, this period should not be confused with a delivery estimate. Rather, we expect the product to ship from the manufacturer's warehouse within this time-frame.

What does this mean for you? Once you place an order on our site, we begin processing the order with the manufacturer. The processing lead time we list on the product page is the most current estimate from the manufacturer regarding the product.

Below, we answer the top three FAQs our customers have regarding delivery estimates.


How long will it take to receive my commercial mailbox?

When you order a commercial or cluster mailbox, we process the order with the manufacturer within 1 business day. Once processed, the order usually ships in the time-frame listed on the product page. Since Cluster Mailboxes are large items, they ship via freight carriers. This means that the transit times for these will usually be 5 to 7 business days.

A few things to note about purchasing a cluster mailbox or similar large, commercial-grade product:

  • The freight carrier will call the number you list on the shipping address a day before delivery to schedule a delivery appointment with you.
  • The manufacturer ships using their chosen freight carrier depending on the products ordered and the delivery location.
  • The majority of online retailers who sell commercial mailboxes (CBUs, etc.) ship directly from the manufacturers, just as we do.
  • If you purchase a commercial mailbox from us and decide to cancel because a competitor lists a "faster" lead time on their site, you may be delaying the time it will take to receive your mailboxes. Why? Because you are placing a new order to be sent to the same manufacturer for processing.
  • If you choose professional mailbox installation with your commercial mailbox purchase, please note that same-day installation is not available. Installation will be scheduled after the delivery of your mailbox. In most cases, installation is completed within one week following delivery.

What if I order multiple products from different brands?

If you ordered multiple products, it is possible that they are made by different manufacturers. If this is the case, your products will ship to you separately from each manufacturer.

For example, if you purchase a Mayne Post with a Whitehall Mailbox, your post will ship from Mayne's warehouse in about 3 business days, but your mailbox will ship separately from Whitehall in about 2 to 3 weeks if customized with address numbers.

How can I estimate my shipment's transit time?

Depending on the carrier and your location, transit times will vary. Delivery estimates are best projected using your carrier tracking number. Once your order ships, we'll send you a shipping confirmation email that includes your carrier (FedEx, UPS, YRC, etc.) and tracking number.

Note: If you place an order with us and do not receive an Order Confirmation email, check your spam inbox. If you still do not see an Order Confirmation email in your inbox, contact us right away at (866) 707-0008 . We will provide you with your Order Number and any other details you need.

What is the CBU Price Match Guarantee?

Price Match

It's pretty simple. If you find this model* cluster mailbox on another online retail site for a lower price, including any shipping and taxes, then we will match that competitor's price.

Before we can match a competitor's price, please note:

  • We will need the exact URL of the product page in question. A screenshot of the competitor website will not suffice.
  • Some competitors hide their freight charges until you enter the checkout, so please keep this in mind.
  • If you are ordering multiple units, check our Volume Discount Pricing table (to the right of our sale price) to see if we're the better price for the quantity you need.

* By "model", we mean a CBU that has the same number of tenant doors and the same manufacturer specifications.

Wall Mount Mailboxes Locking Mailboxes Commercial Residential

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