Centralized mail delivery

During the nineteenth and early twentieth centuries, letter carriers knocked on the door and waited patiently for someone to answer.

Efficiency experts estimated that each carrier lost an hour and a half each day just waiting for patrons to come to the door.

To gain back those precious hours, in 1923 the Post Office Department mandated that every household have a mailbox or letter slot to receive mail.

The initial suggestion for the creation of the cluster box was submitted by Peter McHugh, a postal carrier in Los Angeles Ca.

At one time, some manufacturers even offered a high security CBU option for those areas which require a bit more protection.

The latest USPS approved design includes taller parcel compartments to better accommodate package sizes of today.

Available in various designs, these fashionable snap-together accessories place the final touches on the CBU so that it will complement the surrounding architecture.

[edit] Other Equipment Options The USPS created guidelines to dictate that wall-mounted vertical or horizontal wall-type boxes are to be specified in these settings.

Former approval standards were considered STD-4B+ and related to specific form factors and security levels of the mailbox.