3620 – 4B+ Horizontal Mailbox – 5 Door High Unit – 20 Doors (19 Usable) – Front Loading – USPS Access


4B Horizontal Mailboxes are USPS approved for replacement installations. All units are available in front- loading or rear-loading configurations with options for 10 – 35 tenant doors.


Item# 3620F


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Product Description

Salsbury 3600 Series 4B+ Horizontal Mailboxes – Front Loading – U.S.P.S. Access


Size: 29.25″ W x 40.75″ H x 16.5″ D

Weight: 85 lbs.




  • 4B+ horizontal mailboxes are U.S.P.S. approved for replacement and/or retrofit installations
  • Manufactured by Salsbury Industries to USPS-STD-4B+ Specifications
  • Ideal for apartments, condominiums, commercial buildings and residential developments
  • Made entirely of aluminum
  • Feature a durable powder coated finish available in aluminum, bronze, gold and sandstone
  • Available in “A” size doors (6-1/2″ W x 5-1/4″ H) and larger “B” size doors (13″ W x 5-1/4″ H)
  • Units with standard “A” size doors are available in 3, 4 or 5 doors wide and 5, 6 or 7 doors high
  • Units with larger “B” size doors are available in 2 doors wide and 5, 6 or 7 doors high
  • Doors include a 5 pin cylinder cam lock (with 2 keys)
  • Front loading door panel swings on a continuous hinge
  • Rear Loading – All openings are usable on rear loading units.
  • Front Loading – One mailbox opening is required for a master postal lock (installed by the U.S.P.S.) and cannot be used for mail distribution
  • Rear Loading – Include factory installed 3/4″ W x 1/4″ D trim and a removable aluminum rear cover
  • Front Loading – Include factory installed 3/4″ W x 1/4″ D trim and a solid rear cover
  • Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936




Happy Customers


For over 15 years, Mailbox World has offered our customers the highest quality mailboxes at the lowest prices available online. At Mailbox World, you will find one of the largest selections of USPS approved commercial and community mailboxes in the industry. We provide a safe and secure online shopping experience, or you can contact a mailbox specialists by phone at 1-833-929-6245.

Why shop Mailbox World over some other mailbox websites you may find online?

Low Price Guarantee – Mailbox World guarantees the lowest price on every mailbox sold in our store. We check our competitor’s website weekly to make sure we are currently advertising the lowest prices. If you ever happen to find a lower price advertised somewhere else by a licensed dealer, just let us know and we’ll beat it…. Guaranteed.

Made in the USA - All of our Mailboxes are MADE in the USA and ship from Kansas, California, Ohio, Florida, or Michigan (depending on the brand).

Fast, Free Shipping – We offer free shipping on all mailbox orders over $10,000 shipped within the contiguous United States. We can ship to AK, PR, as well as internationally. Please contact us for a quote if needed. Most stock items ship within 3 business days and custom items in about 2 weeks. Lift gate service is included for larger items.

Excellent Customer Service – At Mailbox World, our goal is to provide the best customer service in the industry. Our knowledgeable mailbox specialists are here to help and can be reached by phone, chat or email between 8:30am and 5:30pm EST. We love talking to our customers, so please reach out with any questions.

Returns - If you need to return a product, please email us at sales@mailboxworld.com or call us at 833-929-6245. We will issue an RGA (Return Good Authorization) if that item is eligible for return. Please note: Returned goods will not be accepted without an RGA (returned goods authorization) number from us. Orders must be shipped freight prepaid and a 25% restocking fee may apply. Products must be returned in their original shipping cartons within fifteen (15) days of receipt. Custom orders and engraved items cannot be returned. Also, 4C and 4B mailboxes cannot be returned. Customer is responsible for paying the original freight and return freight costs. If for any reason the product arrives damaged or defective, we will issue an RGA for that item and send you a new product – no extra cost to you.

Contact Information:

Phone – Toll Free 833-929-6245

Email – sales@mailboxworld.com

Technical Info

tech_3620FL– Technical Drawing (PDF)

inst_horizontals_front – Installation Instructions (PDF)


Salsbury Industries Warranty Information


Salsbury Industries provides a three (3) year limited warranty to the original purchaser. This three (3) year limited warranty is extended to five (5) years for the 3300 series Cluster Box Units (CBU’s), Regency® CBU’s and the 3400, 3700, 3800 and 3900 series 4C horizontal mailboxes. Salsbury Industries warranties cover defects in material and workmanship if reported in writing to Salsbury Industries within three (3) years (five (5) years for CBU’s and 4C) of the delivery date.


This warranty is limited to the cost of the products and does not include installation costs, transportation neglect or costs, misuse or alterations by the customer. Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages; as such this limitation and exclusion may not apply to you. Salsbury Industries, at its option, may replace or repair defective products.