Salsbury 6 Door High Recessed Mounted 4C Horizontal Mailbox | 3 Doors with USPS Access - Rear Loading

The Salsbury 3706S-03ARU is a USPS-approved, recessed-mounted 4C horizontal mailbox manufactured to USPS-STD-4C specifications for new construction and major renovation projects in apartments, commercial buildings, and residential developments. Configured as a single-column, 6-door-high unit at 23⅞" tall, it accommodates 3 MB1 tenant compartments in a rear-loading configuration, designed for installations where carrier mail delivery is accessed from behind the unit through a heavy-duty rear access door with latch and continuous hinges rather than through a front master door panel. The rear-loading design is particularly suited to pass-through wall installations in lobbies or mailrooms where front and rear access are separated. The unit meets ADA reach requirements when installed per specified height guidelines, and includes factory-installed trim and a 4C connector kit for linking multiple units. Security & Construction Features USPS-approved outgoing mail compartment with fixed front panel, no USPS master lock access door on front 3 tenant doors each fitted with a heavy-duty cam lock with dust/rain shield and 3 keys Heavy-duty rear access door with latch and continuous hinges for carrier mail loading Outgoing mail slot: 11¾" W × ¾" H with weather protection hood Heavy-duty aluminum construction with stainless steel hardware Durable powder-coated finish available in aluminum, bronze, sandstone, and black Factory-installed 1" W × ¼" D trim for clean recessed installation Includes 4C horizontal mailbox connector kit for linking multiple units (hardware included) ADA reach compliant when installed per height guidelines (top row ≤48" AFF, bottom row ≥28" AFF) ISO 9001:2015 certified Specification Specifications Dimensions 17" W × 23.875" H × 16.5" D Weight 50 lbs Number of Tenant Doors 3 (MB1 Size) MB1 Door Dimensions 12¾" W × 3¼" H each Number of Parcel Lockers None included – parcel lockers available as separate units per USPS 1:5 ratio requirements Column Configuration Single Column (1 Door Wide) Unit Height Category 6 Door High Lock Type Heavy-Duty Cam Lock with Dust/Rain Shield (3 Keys per Door) Outgoing Mail Slot 11¾" W × ¾" H with Weather Protection Hood Carrier Access Rear Access – Heavy-Duty Rear Door with Latch and Continuous Hinges (no front USPS master lock door) Loading Type Rear Loading Mount Type Recessed Mounted Access Type USPS Access – Rear Loading Indoor / Outdoor Use Both ADA Compliance Meets ADA reach requirements when top row installed ≤48" AFF and bottom row ≥28" AFF Primary Material Heavy-Duty Aluminum Hardware Stainless Steel Finish Powder Coated – Aluminum Available Colors Aluminum, Bronze, Sandstone, Black Intended Use Apartments, Commercial Buildings, Residential Developments – New Construction and Major Renovations What's Included Mailbox Unit, Factory-Installed Trim (1" W × ¼" D), Heavy-Duty Rear Access Door with Latch and Continuous Hinges, 4C Horizontal Mailbox Connector Kit Model Number 3706S-03ARU Compliance & Certifications USPS Approved | ISO 9001:2015 Certified | ADA Reach Compliant (installation height dependent) Lead Time Usually ships within 1–2 weeks. Downloads More Product Information Product Overview Installation Instructions Technical Drawing ADA Compliant Units Product Configurations