[XPB-3713S-XX] Commercial Horizontal mailboxes are constructed entirely of aluminum with an aluminum powder finish and are USPS approved. These Apartment and Office Mail Distribution Center Mailboxes are 13 door heights, front loading with a solid rear back. Also available in 15, 11, 9, 7, 5, and 3 door heights (sold separately) Recessed mounted horizontal mailboxes are available in several compartment configurations (See Selections). Units include one or two (2) front loading master door(s) that swing(s) on a continuous hinge and a compartment equivalent to two (2) 3-1/4” high standard doors is used for outgoing mail collection. The compartment is labeled “Outgoing Mail” and includes a 10-3/4” H x 3/4” H mail slot and weather protection hood. The outgoing mail compartment includes the U.S.P.S. master lock access door and cannot be used for mail distribution. Units include factory installed 1/2” W x 1/4” D trim and a solid closed back. Custom engraved placards (XPB-3767) are sold separately. For shipping quotes, orders or questions please call our Customer Service Center at 1-877-483-9270.