Salsbury 3700 Horizontal Series 9-Compartment Recessed Mount Mailbox, Front-Loading Aluminum9 door recessed 4C horizontal mailbox USPS approved 4C recessed mailbox with nine tenant compartments for apartments and commercial buildings. Constructed of heavy duty aluminum with stainless hardware and a durable powder coated finish, it features front loading access and an outgoing mail slot with weather hood. Key Features: USPS Approved 4C Design: Meets USPS STD 4C specs for new construction and major renovations Durable Construction: Heavy duty

9-door recessed 4C horizontal mailbox

USPS-approved 4C recessed mailbox with nine tenant compartments for apartments and commercial buildings. Constructed of heavy-duty aluminum with stainless hardware and a durable powder-coated finish, it features front-loading access and an outgoing mail slot with weather hood.

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Key Features:

• USPS Approved 4C Design: Meets USPS-STD-4C specs 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 with dust/rain shields and 3 keys per door
• Convenient Outgoing Mail: Integrated mail slot with anti-fish plate and weather protection hood
• Recessed Front-Loading: Clean built-in look with factory-installed trim and solid rear cover

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Series	3700 4C Horizontal
Configuration	6-door high unit with 9 tenant doors (front loading) and outgoing mail slot
Mounting Type	Recessed mount
Overall Dimensions	31.125 in W x 23.875 in H x 16.5 in D
Material	Heavy-duty aluminum with stainless steel hardware
Finish	Durable powder-coated (aluminum color; other finishes available)
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
Security	Heavy-duty cam locks with dust/rain shields; anti-fish plate on mail slot
Outgoing Mail	10-3/4 in W x 3/4 in H slot with weather protection hood
Compliance	USPS-STD-4C; ADA height compliant units available
Included	Factory-installed 3/4 in W x 1/4 in D trim; solid rear cover; 4C connector kit
Use	Indoor or outdoor
Brand	Salsbury Industries

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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 mail delivery.

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Q: How many tenant compartments does it include?
A: Nine individually numbered compartments plus an outgoing mail slot/carrier access door.

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Q: Is it suitable for outdoor use?
A: Yes, it’s designed for indoor or outdoor installation with a durable powder-coated finish.

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Q: What mounting style is required?
A: Recessed mount into a wall; free‑standing or surface-mount enclosures are optional accessories.

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

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Streamlined Mail Center, Seamless Architecture

This recessed mailbox unit dissolves into the wall with crisp, architectural lines, creating a refined mail hub for multifamily entries. The uniform aluminum face and numbered doors bring order and quiet sophistication to shared spaces. Pair it with warm wood cladding or honed concrete to heighten the material contrast and elevate the lobby experience. It’s a polished essential that signals thoughtful, modern living.

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Upgrade your building’s mail center with this secure, USPS-approved 9-door recessed unit—built to last and ready for seamless installation.

Installation