Salsbury Industries 3503ARU 4B Plus Vertical Mailbox

Product Description

The SALSBURY INDUSTRIES 3503ARU is a 4B Plus vertical mailbox designed for recessed wall mounting in multi-unit residential and commercial mail delivery applications. Built from aluminum with a silver finish, this unit meets USPS access requirements for centralized mail delivery. The three-door configuration serves three individual recipients from a single recessed installation. At 27.5 pounds, the unit is substantial enough for permanent installation while remaining manageable for a two-person install crew. Licensed contractors and facilities maintenance professionals handle this type of installation.

This mailbox is suited for new construction and renovation projects requiring USPS-compliant centralized delivery points. The recessed mount style integrates flush with the wall surface, making it appropriate for apartment lobbies, office corridors, condominium entryways, and similar semi-public spaces where a clean, built-in appearance is required. The 4B Plus designation indicates compliance with USPS STD-4B+ specifications governing multi-unit mail receptacles. The aluminum construction resists corrosion, making it viable for covered outdoor and climate-controlled indoor environments.

Key Features

• USPS-access compliant 4B Plus designation for centralized mail delivery
• Three individual compartment doors serving three recipients
• Recessed mount design for flush wall integration
• Aluminum construction with silver finish for corrosion resistance
• Single-unit package ready for direct installation

Compatibility

Designed as an OEM-style recessed-mount replacement or new-construction mailbox unit within the SALSBURY INDUSTRIES 3500 Series 4B Plus vertical mailbox product line.

Installation Notes

Installation should be performed by a licensed contractor familiar with wall framing, rough-in dimensions, and local building code requirements. Power down any adjacent low-voltage wiring before cutting the wall opening to accommodate the recessed housing. The wall cavity must be framed to the unit dimensions prior to setting the mailbox. Coordinate with your local postmaster before finalizing placement to confirm USPS access and approval requirements for the specific installation site.