3700 Series Recessed 4C Mailbox, 3 Parcel Lockers

USPS-approved recessed 4C horizontal mailbox constructed from heavy-duty aluminum with stainless steel hardware. Designed for apartments and commercial buildings, this maximum-height double-column unit features 15 tenant doors plus three integrated parcel lockers and an outgoing mail compartment.

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Key Features:

• USPS 4C Compliance: Approved front-loading unit with carrier access door for USPS master lock
• Durable Construction: Heavy-duty aluminum body with stainless steel hardware and powder-coated finish
• Secure Access: Heavy-duty cam locks with anti-fish plate on outgoing mail slot
• Integrated Parcel Lockers: Three fully integrated lockers to meet required 1:5 parcel ratio
• Flexible Installation: Recessed mount design; connector kit supports multi-unit installations

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Series	Salsbury 3700 Series 4C Horizontal Mailboxes
Mounting	Recessed mount
Loading	Front loading with USPS access
Configuration	Double column; 15 tenant doors; 3 parcel lockers; outgoing mail compartment
Overall Dimensions	31.125" W x 57.125" H x 16.5" D
Weight	165 lbs
Construction	Heavy-duty aluminum with stainless steel hardware
Finish Options	Powder coated in aluminum, bronze, gold, or sandstone
Lock Type	Heavy-duty cam locks; carrier access door for USPS master arrow lock
Security Features	Anti-fish plate on rear of mail slot
Door Sizes	MB1 3-1/4" H x 13-1/4" W; MB2 6-3/4" H x 13-1/4" W; MB3 10-1/4" H x 13-1/4" W; MB4 13-3/4" H x 13-1/4" W; parcel lockers available PL3, PL4, PL4.5, PL5, PL6
Compliance	USPS-STD-4C; ADA height compliant units available
Outgoing Mail Slot	10-3/4" W x 3/4" H with weather protection hood
Included Trim	Factory installed 3/4" W x 1/4" D trim and solid rear cover
Connector Kit	Includes 4C horizontal mailbox connector kit to connect multiple units

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Frequently Asked Questions (FAQ):

Q: How many tenant compartments and parcel lockers are included?
A: This double-column unit provides 15 tenant mail doors and 3 integrated parcel lockers, plus an outgoing mail compartment.

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Q: Is this mailbox compliant with USPS 4C standards?
A: Yes, it is manufactured to USPS-STD-4C specifications and includes a carrier access door for the USPS-provided master arrow lock.

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Q: Can it be installed outdoors?
A: Yes. It is suitable for indoor or outdoor use when recessed-mounted into a wall per manufacturer guidelines.

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Q: What are the overall dimensions?
A: Approximately 31.125 in W x 57.125 in H x 16.5 in D.

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Q: What finishes are available?
A: Powder-coated finishes include aluminum, bronze, gold, and sandstone; this listing shows the aluminum finish.

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Streamlined, Secure, and Architecturally Clean

This recessed 4C mailbox brings a crisp, modern cadence to multi-tenant entries, with a balanced double-column layout that feels intentional and refined. The aluminum face and neatly numbered doors create a graphic rhythm—elevating utility into design. Pair it with a monochrome wall panel or textured stone surround to let the sleek hardware shine. It’s a polished essential for sophisticated, high-traffic spaces.

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Upgrade your building’s mailroom with this USPS-approved, secure 4C unit—order today for streamlined delivery and tenant convenience.

Installation