Product Description 3700 series recessed mounted 4C parcel parcel locker is manufactured by Salsbury Industries to USPS-STD-4C specifications. Ideal for apartments, commercial buildings and residential developments. The 4C parcel locker is constructed of heavy duty aluminum and stainless steel hardware. Feature a durable powder coated finish available in aluminum, bronze, gold and sandstone. Fit with a 2 key security system that allow tenants a convenient way to receive packages on site. U. S. P. S. standard 4 C requires a minimum on 1 parcel locker for every 10 tenant compartments. Available in a front loading or rear loading unit. From the Manufacturer Salsbury 3700 Series 4C Horizontal Mailboxes - Front Loading - U.S.P.S. Access are ideal for apartments, commercial buildings and residential developments. 4C horizontal mailboxes are U.S.P.S. Approved. Required for new construction and major remodels. U.S.P.S. standard 4C requires a minimum of 1 parcel locker for every 10 tenant compartments. For indoor or outdoor use. Constructed of heavy duty aluminum and stainless steel hardware. Feature a durable powder coated finish available in aluminum, bronze, gold and sandstone. Doors include a heavy duty cam lock with a dust/rain shield and 3 keys. MB1 doors are 13-1/4'' W x 3-1/4'' H, MB2 doors are 13-1/4" W x 6-3/4" H, MB3 doors are 13-1/4" W x 10-1/4" H and MB4 doors are 13-1/4" W x 13-3/4" H. Available in three (3) MB1 equivalent door high units to fifteen (15) MB1 door high units. The popular maximum high (56-3/4"H) units are also available. ADA compliance guidelines. Available in configurations that are 1 door wide (single column) and 2 doors wide (double column). Fully integrated and stand-alone parcel lockers are available in 5 MB1 door heights (PL5 - 17-1/4" high) and 6 MB1 door heights (PL6 - 20-3/4" high). A compartment equivalent to two 3-1/4" high standard doors is used for outgoing mail collection and is labeled "Outgoing Mail". Outgoing mail compartment includes the U.S.P.S. master lock access door (lock installed by the U.S.P.S.) and cannot be used for mail distribution. Outgoing mail compartment includes a 10-3/4" W x 3/4" H mail slot and weather protection hood. Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936.