Salsbury 4C Horizontal Mailbox, Front-Loading, Aluminum, 56-3/4 in H x 31-1/8 in W, 20 MB1 Doors with 2 Parcel LockersSalsbury Front Loading 4C Horizontal Mailbox, 20 Doors 2 Parcel Lockers USPS STD 4C approved recessed 4C horizontal mailbox built from heavy duty aluminum with stainless hardware. This double column, front loading unit provides 20 tenant compartments plus two integrated parcel lockers and an outgoing mail slot, ideal for apartments and commercial buildings. Key Features: USPS Approved 4C Design: Complies with USPS STD 4C for new construction and

Salsbury Front-Loading 4C Horizontal Mailbox, 20 Doors/2 Parcel Lockers

USPS-STD-4C approved recessed 4C horizontal mailbox built from heavy-duty aluminum with stainless hardware. This double-column, front-loading unit provides 20 tenant compartments plus two integrated parcel lockers and an outgoing mail slot, ideal for apartments and commercial buildings.

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Key Features:

• USPS Approved 4C Design: Complies with USPS-STD-4C for new construction and renovations
• Durable Construction: Heavy-duty aluminum body with stainless steel hardware and powder-coated finish
• Secure Access: Heavy-duty cam locks with dust/rain shields and 3 keys per door; carrier access door for USPS arrow lock
• Integrated Parcel Lockers: Two built-in parcel lockers meet the 1:5 parcel-to-tenant ratio
• Flexible Installation: Recessed mount with factory-installed trim; indoor/outdoor use

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Series	Salsbury 3700 Series 4C Horizontal Mailboxes
Mounting Type	Recessed mount
Access Type	Front loading (USPS access)
Overall Dimensions	31.125 in W x 57.125 in H x 16.5 in D
Unit Height Class	Maximum height unit (56-3/4 in nominal)
Tenant Compartments	20 MB1 doors
Parcel Lockers	2 integrated parcel lockers (meet 1:5 ratio)
Outgoing Mail	Outgoing mail compartment with 10-3/4 in W x 3/4 in H slot and weather hood
Door Sizes	MB1 doors: 3-1/4 in H x 13-1/4 in W
Construction	Heavy-duty aluminum with stainless steel hardware
Finish	Durable powder coat (aluminum, bronze, gold, sandstone options)
Locks	Heavy-duty cam locks; 3 keys per tenant door; carrier access door accepts USPS master arrow lock
Compliance	Manufactured to USPS-STD-4C; ADA height compliant units available
Included	Factory-installed 3/4 in W x 1/4 in D trim; solid rear cover; connector kit to join multiple units
Use	Indoor or outdoor

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Frequently Asked Questions (FAQ):

Q: Is this mailbox USPS approved?
A: Yes, it is manufactured to USPS-STD-4C and approved for USPS access.

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Q: How is it installed?
A: It is a recessed-mounted unit with factory-installed trim; follow the included installation instructions and technical drawings.

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Q: Can it be used outdoors?
A: Yes, it is designed for indoor or outdoor use with a durable powder-coated finish.

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Q: What are the compartment sizes?
A: MB1 tenant doors are 3-1/4 in H x 13-1/4 in W; unit includes two parcel lockers meeting USPS 4C requirements.

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Q: Does it include an outgoing mail slot?
A: Yes, it has a labeled outgoing mail compartment with a 10-3/4 in W x 3/4 in H slot and weather hood.

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Streamlined Mail Organization with Architectural Presence

This 4C mailbox reads as a refined architectural element—sleek aluminum planes and crisp geometry that tidy a lobby with conviction. The hand-finished, powder-coated surface offers a subtle sheen, while the rhythm of numbered doors creates an elegant, ordered façade. Pair it with warm wood cladding or honed concrete to strike a modern, hospitality-grade moment. It’s a polished essential that elevates daily routines into a gesture of considered luxury.

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Outfit your building with USPS-approved, secure mail delivery—add this Salsbury 4C mailbox to your project today.

Installation