Salsbury 4C standard horizontal 3700 series mailboxes are USPS approved and meet the specifications of USPS-STD-4C. A compartment equivalent to two (2) 3-1/4"e; high standard doors is used for outgoing mail collection. The compartment is labeled "e;Outgoing Mail"e; and includes a 10-3/4"e; H x 3/4"e; H mail slot and weather protection hood. The front of the outgoing mail compartment is comprised of two (2) fixed panels and there is no U.S.P.S. master lock access door. Fully integrated or stand-alone parcel lockers offer tenants a convenient way to receive packages on site. Units include factory installed 3/4"e; W x 1/4"e; D trim and one or two (2) heavy duty rear access door(s) with latches and continuous hinges. Custom engraved placards (related item #3767) are available as an option upon request. Units are ideal for apartments, residential communities, commercial buildings and many other applications.