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