Front-Loading 4C Horizontal Mailbox, 20 MB1 Doors

USPS-approved recessed-mounted 4C horizontal mailbox built from heavy-duty aluminum with stainless hardware. Front-loading design includes 20 MB1 tenant doors and an outgoing mail compartment, ideal for apartments and commercial buildings.

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Key Features:

• USPS Approved: Meets USPS-STD-4C for secure mail delivery
• 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
• Outgoing Mail Slot: Integrated, labeled compartment with weather protection hood
• Recessed Mounting: Factory-installed trim and solid rear cover for clean, flush installation

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Mounting Style	Recessed-mounted (front loading)
Overall Dimensions	31.125" W x 41.375" H x 16.5" D
Construction	Heavy-duty aluminum with stainless steel hardware
Finish	Durable powder coat (aluminum, bronze, gold, sandstone options)
Doors	20 MB1 tenant doors (3-1/4" H x 13-1/4" W) with heavy-duty cam locks and 3 keys
Outgoing Mail	Integrated compartment labeled “Outgoing Mail” with 10-3/4" W x 3/4" H slot and weather protection hood
USPS Compliance	Manufactured to USPS-STD-4C; USPS installs master arrow lock on carrier access door
Parcel Locker Guidance	USPS requires minimum 1 parcel locker per 5 tenant compartments; minimum 15" H locker to meet ratio
Trim & Cover	Factory-installed 3/4" W x 1/4" D trim and solid rear cover
ADA	ADA height compliant units available
Series	Salsbury 3700 Series 4C Horizontal Mailboxes

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Frequently Asked Questions (FAQ):

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

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Q: How many tenant compartments are included?
A: This unit includes 20 MB1 (3-1/4" H x 13-1/4" W) doors plus an outgoing mail compartment.

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Q: Can it be installed outdoors?
A: Yes, it is suitable for indoor or outdoor use thanks to its powder-coated, all-aluminum construction.

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Q: What mounting style is required?
A: This is a recessed-mounted unit designed to install flush within a wall opening.

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Q: Does it come with locks and keys?
A: Each door includes a heavy-duty cam lock and 3 keys; the USPS installs the master arrow lock for carrier access.

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Streamlined Mail Management with Architectural Poise

This sleek aluminum mailbox brings order and refinement to multifamily entries and commercial corridors. Its crisp, recessed silhouette and uniform, numbered doors create a modern grid that feels both functional and elevated. Pair it with warm wood paneling or polished concrete to accentuate the powder-coated finish and subtle hardware detailing. A considered essential for sophisticated, high-traffic spaces, it delivers durability with design-forward clarity.

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Upgrade your property’s mail center with this USPS-approved, 20-door 4C mailbox—built for durability, security, and a clean recessed installation.

Installation