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Salsbury 3504ASU 4-Door Vertical Mailbox - Aluminum Finish - USPS Access

(View all from Salsbury Industries)
SKU: WL-3504ASUBM  |  View All 4 Door Surface Vertical Mailboxes
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.

Salsbury 3504ASU 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 tenanta€™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 tenanta€™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:
Salsbury 3504ASU 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.

Salsbury 3504ASU 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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Regarding a Product's Shipping Estimate

Understanding Lead Times

The lead times listed on this product page represent the best-case scenario for shipping estimates. While we may show that a product "usually ships" within a given period, this period should not be confused with a delivery estimate. Rather, we expect the product to ship from the manufacturer's warehouse within this time-frame.

What does this mean for you? Once you place an order on our site, we begin processing the order with the manufacturer. The processing lead time we list on the product page is the most current estimate from the manufacturer regarding the product.

Below, we answer the top three FAQs our customers have regarding delivery estimates.


How long will it take to receive my commercial mailbox?

When you order a commercial or cluster mailbox, we process the order with the manufacturer within 1 business day. Once processed, the order usually ships in the time-frame listed on the product page. Since Cluster Mailboxes are large items, they ship via freight carriers. This means that the transit times for these will usually be 5 to 7 business days.

A few things to note about purchasing a cluster mailbox or similar large, commercial-grade product:

  • The freight carrier will call the number you list on the shipping address a day before delivery to schedule a delivery appointment with you.
  • The manufacturer ships using their chosen freight carrier depending on the products ordered and the delivery location.
  • The majority of online retailers who sell commercial mailboxes (CBUs, etc.) ship directly from the manufacturers, just as we do.
  • If you purchase a commercial mailbox from us and decide to cancel because a competitor lists a "faster" lead time on their site, you may be delaying the time it will take to receive your mailboxes. Why? Because you are placing a new order to be sent to the same manufacturer for processing.

What if I order multiple products from different brands?

If you ordered multiple products, it is possible that they are made by different manufacturers. If this is the case, your products will ship to you separately from each manufacturer.

For example, if you purchase a Mayne Post with a Whitehall Mailbox, your post will ship from Mayne's warehouse in about 3 business days, but your mailbox will ship separately from Whitehall in about 2 to 3 weeks if customized with address numbers.

How can I estimate my shipment’s transit time?

Depending on the carrier and your location, transit times will vary. Delivery estimates are best projected using your carrier tracking number. Once your order ships, we'll send you a shipping confirmation email that includes your carrier (FedEx, UPS, YRC, etc.) and tracking number.

Note: If you place an order with us and do not receive an Order Confirmation email, check your spam inbox. If you still do not see an Order Confirmation email in your inbox, contact us right away at (866) 707-0008 . We will provide you with your Order Number and any other details you need.

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