Commercial Mailboxes Indoor Commercial Mailboxes Clusterbox Units
Got a bit confused when I was looking for parts for my mailbox so I started a chat with a rep. They respond quickly and they helped me get the product numbers...

- Angela
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National Apartment Association Buyers Guide Registered Quality System ISO 9001:2008

horizontal mailboxesusps approved horizontal mailboxes

4B+ 1400/1500 Horizontal Mailboxes

Postal Products Unlimited recommends the STD-4C to all customers interested in purchasing Horizontal Mailboxes since the U.S Postal Service discontinued the 4B+ for all new construction. Older styles of horizontal or vertical mailboxes known as STD-4B+ are still considered USPS-Approved when used to replace existing mailboxes - as long as the installation does not disturb the existing wall opening. Please see your local Postmaster with any questions. The USPS issued the STD-4B+ effective March 2005. This regulation requires improved Arrow lock compartment security on all horizontal and vertical wall-mounted mailboxes.


Front Loading Horizontal 4B Mailboxes are designed for both USPS and private mail delivery. Contact our customer service department for more information on these durable all-metal commercial mailboxes.


Interested in 4B 1400/1500 Horizontal Mailboxes?
Browse our extensive selection of 4B 1400/1500 Horizontal Mailboxes, sure to fit your specific needs. Contact our reliable customer service staff at 1-800-229-4500 with any questions you may have or to inquire about custom orders.