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SKU: WL-3504ASUBM  |  View All 4 Door Surface Vertical Mailboxes

4-Door Vertical Mailbox - Aluminum Finish - USPS Access

(View all from Salsbury Industries)
List Price:
You Save:

$44.03 (20%)

Volume Discount Pricing
2 - 5$164.00
6+ $154.50
Per the USPS standards, vertical (4B) mailboxes are only to replace existing vertical (4B) mailboxes. All new construction should use 4C Cluster Mailboxes, per USPS regulations. We strongly advise that you discuss installation with your local post master.
According to manufacturer:
Usually ships in 1 to 3 business days
Custom Engrave ships in 1 to 2 week
Ships directly from the factory floor to ensure the quickest available delivery.

4-Door Vertical Mailbox - Aluminum Finish - USPS Access

Vertical mailboxes by BudgetMailboxes come in various door configurations such as these 4-door vertical mailboxes. These 3500 mailboxes come in beautiful brass, bronze, aluminum, green and sandstone. Custom engraved self-adhesive placards are available for extra personalisation. These vertical mailboxes are ideal for use in apartment buildings and office high rises.

4 Doors USPS Vertical Mailbox Aluminum Surface Features:

  • Constructed entirely of aluminum
  • 4-door vertical mailbox, four (4) cam locks with two (2) keys per box
  • Surface mounted
  • Extruded aluminum doors measure 16-1/4'' H x 5-1/2'' W
  • Adheres to USPS-STD-4B+ requirements
  • Optional outgoing mail slot
  • Optional master commercial lock
  • Optional 4B+ master door security retrofit kit
  • Custom engraved self adhesive placards
  • Available in Bronze, Aluminum, Brass, Sandstone, and Green
Made entirely of aluminum, Salsbury 3500 series U.S.P.S. approved vertical mailboxes are available in surface mounted and recessed mounted units. The mailboxes feature 5-1/2" W x 16-1/4" H extruded aluminum doors and a durable powder coated finish available in five (5) contemporary colors - Aluminum, Brass, Bronze, Sandstone, and Green. Each mailbox door includes a five (5) pin cylinder cam lock with two (2) keys and a 2-1/2" W x 5/8" H indentation to accommodate a label (included) to identify the tenant’s name and/or box number. Mailboxes are available in units with three (3) to seven (7) compartments. Each compartment is 6-3/4" deep. Vertical mailboxes are ideal for apartments, condominiums, commercial buildings and many other applications.

Vertical Mailbox Options

  • Outgoing mail slot - in the far left door of the unit unless otherwise specified (#3569)
  • Master commercial lock - with (2) keys - when units are for private access (#3575)
  • 4B+ Master door security retrofit kit (#3596)

Door Identification
Each mailbox door includes a 2-1/2" W x 5/8" H indentation to accommodate a label (included) to identify the tenant’s name and/or box number. Custom identification systems are available as an option upon request.


  • Each mailbox door includes a five (5) pin cylinder cam lock with (2) keys (1,000 different key changes) (#3590)
  • Additional keys per lock when ordering (#3598)
  • Key blanks - box of (50)

Letter Boxes
A letter box is an ideal way to collect outgoing mail or other correspondence.

Outgoing Mail Slot (Option #2266)
A 4-3/8" W x 1/2" H outgoing mail slot is available as an option upon request. It will be located in the far left door of the unit unless otherwise specified. If a mail slot is requested, order unit with one additional compartment than the total number of tenants receiving mail.

Custom Engraved Placards (Option #3567)
2-1/2" W x 5/8" H custom engraved self-adhesive placards are available as an option upon request.

Recessed mounted units fit into a rough opening and are secured with mounting hardware through the back or side panels. Recessed units feature a fully integrated flanged
collar which fits over the rough opening.

Note: For U.S.P.S. accessed vertical mailboxes, the master lock in the top tier of mailboxes must be no more than 58" above the finished floor. The master lock in the bottom
tier of mailboxes must be no less than 30" above the finished floor. No more than two (2) tiers of mailboxes may be installed.

Rough opening for recessed mounted vertical mailboxes is 1-1/2" less than the unit’s width, 1-1/4" less than the unit’s height and equal to the unit’s depth.

Rough opening for recessed letter boxes (#2245) is 13-3/4" W x 17-3/4" H x 6-3/4" D.

Model: 3504
Description: 4 Doors
Unit Size:
24-1/4" W x 19" H x 7-1/2" D
30 lbs.

For Your Reference:

OUR SKU is Salsbury Industries 3504ASU

This item is also sometimes listed under the following manufacturer numbers:

Dimensions & Weight
Ship Weight:
4-Door Vertical Mailbox - Aluminum Finish - USPS Access
24.25 in. W x 19 in. H x 7.5 in. D
30.00 lbs
General Category:
Commercial Mailbox
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Frequently Asked Questions
Question: Can the 4 slot vertical surface mount mailbox be installed and exposed to the weather?
Answer: It can be installed on the exterior but it needs to be shielded from direct exposure to the elements.

Question: Are custom engraved placards available for the 4-Door Aluminum Vertical Mailbox?
Answer: Yes, custom engraved placards are available as an option. Thank you.

4-Door Vertical Mailbox - Aluminum Finish - USPS Access
Shipping Information:

Shipping Estimate:

Usually ships in 1 to 3 business days
Custom Engrave ships in 1 to 2 week

Stock Status:

In Stock

Ships to:


Ship Method:

FedEx/UPS (Learn More)

Shipping Policy:

Return Policy:

Return Instructions:

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