3700 Series Recessed 4C Mailbox, 9 Doors + 2 Parcel Lockers

USPS-approved 4C horizontal mailbox by Salsbury Industries with nine tenant compartments and two integrated parcel lockers for recessed installation. Built from heavy-duty aluminum with stainless hardware and a durable powder-coated finish for indoor or outdoor use.

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Key Features:

• USPS-STD-4C Compliant: Front-loading unit approved for new construction and major renovations
• Durable Construction: Heavy-duty aluminum body with stainless steel hardware and powder-coated finish
• Secure Access: Heavy-duty cam locks, carrier access door for USPS master lock, and anti-fish outgoing mail slot
• Integrated Parcel Lockers: Two built-in lockers support package delivery and meet 1:5 USPS parcel ratio
• Convenient Features: Individually numbered doors, outgoing mail slot with weather hood, factory-installed trim

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Series	Salsbury 3700 Series 4C Horizontal Mailboxes
Mount Type	Recessed mount, front loading, USPS access
Configuration	Double column; 10-door-high unit with 9 mail doors and 2 parcel lockers; includes outgoing mail compartment
Overall Dimensions	31.125 in W x 37.875 in H x 16.5 in D (approx.)
Construction	Heavy-duty aluminum with stainless steel hardware
Finish	Durable powder-coated (colors available include aluminum, bronze, gold, sandstone; images show black front)
Security	Heavy-duty cam locks; carrier access door for USPS master lock; anti-fish plate on outgoing mail slot
Door Sizes	MB1 doors 3-1/4 in H x 13-1/4 in W; MB2 6-3/4 in H x 13-1/4 in W; MB3 10-1/4 in H x 13-1/4 in W; MB4 13-3/4 in H x 13-1/4 in W (general 4C sizes)
Parcel Locker Options	Integrated parcel lockers; USPS requires minimum 1 parcel locker per 5 tenant compartments
Outgoing Mail Slot	10-3/4 in W x 3/4 in H with weather protection hood
Included Trim	Factory-installed 3/4 in W x 1/4 in D trim; solid rear cover
Compliance	USPS-STD-4C; ADA height compliant units available

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Frequently Asked Questions (FAQ):

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

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Q: Can it be installed outdoors?
A: Yes. It’s designed for indoor or outdoor recessed installations with a powder-coated finish.

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Q: What are the overall dimensions?
A: Approximately 31.125 in W x 37.875 in H x 16.5 in D for the double-column 10-door-high configuration.

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Q: How many tenant compartments and parcel lockers are included?
A: Nine tenant mail compartments plus two integrated parcel lockers, with an outgoing mail slot.

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Q: What comes with the locks?
A: Each tenant door includes a heavy-duty cam lock and typically three keys; USPS installs the master lock for the carrier door.

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Streamlined Mail Management with Architectural Poise

This recessed 4C mailbox brings a crisp, modern order to multifamily lobbies and amenity corridors. The matte, powder-coated face and precisely numbered doors read as a refined grid—elevating everyday function. Pair it with warm wood wall cladding or honed stone to balance the industrial aluminum with organic texture. It’s a polished essential that signals thoughtful, luxury living from the moment residents enter.

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Equip your building with secure, USPS-approved mail delivery—choose this Salsbury 3700 Series recessed unit today.

Installation