Front-Loading 4C Horizontal Mailbox, 15 MB1 Doors + PL5

USPS-approved 4C recessed horizontal mailbox constructed from heavy-duty aluminum with stainless hardware. This double-column unit features 15 MB1 tenant doors, one integrated PL5 parcel locker, and an outgoing mail slot for secure community mail service.

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Key Features:

• USPS-STD-4C Compliant: Approved for new construction and major renovations
• Durable Aluminum Build: Heavy-duty aluminum with stainless steel hardware and powder-coated finish
• Secure Access: Heavy-duty cam locks with dust/rain shields; carrier access door for USPS master lock
• Integrated Parcel Locker: Includes one PL5 locker (17-1/4" H) to meet USPS 1:5 parcel ratio
• Convenient Outgoing Mail: Built-in mail slot with weather protection hood and anti-fish plate

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Construction	Heavy-duty aluminum with stainless steel hardware; powder-coated finish
Mounting Type	Recessed (optional free-standing and surface-mounted enclosures available)
USPS Compliance	USPS-STD-4C; USPS-approved
Overall Dimensions	31.125" W x 41.375" H x 16.5" D
Unit Height	11-door-high (approx. 41-3/8" H), double column
Tenant Compartments	15 MB1 doors (3-1/4" H x 13-1/4" W each)
Parcel Lockers	1 integrated PL5 (17-1/4" H)
Outgoing Mail	10-3/4" W x 3/4" H mail slot with weather protection hood and anti-fish plate
Locks	Heavy-duty cam locks; tenant doors include 3 keys; USPS installs master arrow lock on carrier access door
Finish Options	Available in aluminum, bronze, gold, sandstone
ADA	ADA height compliant units available
Series	Salsbury 3700 Series 4C Horizontal Mailboxes
Configuration	Front-loading, double column, recessed mounted; includes connector kit and solid rear cover

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Frequently Asked Questions (FAQ):

Q: Is this unit USPS approved?
A: Yes, it is manufactured to USPS-STD-4C and is USPS approved for indoor or outdoor use.

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Q: How is the unit mounted?
A: It is designed for recessed mounting; optional free-standing or surface-mounted enclosures are available.

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Q: What are the overall dimensions?
A: Approximately 31.125" W x 41.375" H x 16.5" D.

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Q: What tenant door size does MB1 refer to?
A: MB1 doors are 3-1/4" H x 13-1/4" W.

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

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Streamlined Community Mail—Built for Elegance and Endurance

This 4C mailbox brings a clean, architectural silhouette to shared spaces, marrying function with refined industrial appeal. The powder-coated aluminum finish and crisp, numbered doors create a harmonious, organized façade. Pair it with a matching free-standing enclosure and warm wall materials for a layered, contemporary look. A polished essential that elevates lobbies and corridors with durable, luxurious utility.

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Upgrade your property with USPS-approved, secure 4C mail service—order this Salsbury unit today.

Installation