Salsbury 3700 Horizontal Series Recessed Mount Mailbox, 9 Compartments with 2 Parcel Lockers3700 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. Key Features: USPS STD 4C Compliant: Front loading unit approved for new construction and major renovations Durable

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