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With its high-security design and quality construction, Salsbury’s 3700 series USPS approved 4C horizontal mailboxes will provide years of maintenance free service. These units meet all the requirements of USPS-STD-4C, the new high-security standard developed by the United States Postal Service.

Purpose of This Document

This document provides guidance to architects, designers, & contractors in selecting and installing Salsbury 3700 series mailbox units to provide service in compliance with ADA guidelines for wheelchair reach limitations. The vertical location of the mailbox units “above the finished floor” (AFF) controls the quantity of tenant compartments that comply with the reach requirements.

ADA Reach Requirements

Forward reach from a wheelchair is covered in Section 308.2.1 of the 2010 ADA Standards for Accessible Design published by the U.S. Department of Justice (September 15, 2010). It states: “Where a forward reach is unobstructed, the high forward reach shall be 48 inches (1220 mm) maximum and the low forward reach shall be 15 inches (380 mm) minimum above the finish floor or ground.” See Figure 1.

The 48” maximum high forward reach is also found in the USPS requirements where at least one tenant mailbox must be located less than 48” above the finished floor. The 15” lower limit is also found in the USPS requirements as the lowest position above the finished floor for the shelf surface of a parcel locker.

Figure 1. Forward Reach

ADA Mailboxes - Forward Reach

Side reach from a wheelchair is covered in Section 308.3.1 of the same document. It states: “Where a clear floor or ground space allows a parallel approach to an element and the side reach is unobstructed, the high side reach shall be 48 inches (1220 mm) maximum and the low side reach shall be 15 inches (380 mm) minimum above the finish floor or ground.” See Figure 2.

The 48” maximum high side reach is also found in the USPS requirements where at least one tenant mailbox must be located less than 48” above the finished floor. The 15” lower limit is also found in the USPS requirements as the lowest position above the finished floor for the shelf surface of a parcel locker.

Double Tier Lockers

Figure 2. Side Reach

ADA Mailboxes - Side Reach

Salsbury ADA Compliance

All 6 Door High, 5 Door High, 4 Door High and 3 Door High Salsbury standard configurations are ADA Compliant, with all mailbox units following within ADA guidelines. In addition, the remainder of Salsbury mailbox configurations have tenant compartments that are compliant with those limits.

USPS Regulations

The mailboxes must be installed according to USPS-STD-4C regulations as listed below and shown in Figure 3.

  • 1.“At least one customer compartment shall be positioned less than 48” from the finished floor.”
  • 2.“No parcel locker compartment (interior bottom shelf) shall be positioned less than 15” from the finished floor.”
  • 3.“No patron lock shall be located more than 67” above the finished floor.”
  • 4.“No customer compartment (interior bottom shelf) shall be positioned less than 28” from the finished floor.”
  • 5.“The USPS Arrow lock shall be located between 36” and 48” above the finished floor.”
  • 6.“There must be at least one parcel locker for every ten patron mailboxes in installations of 10 or more patron mailboxes. There is no requirement for parcel lockers in installations of less than 10 patron mailboxes, but one or more parcel lockers are recommended.”

Figure 3.USPS Installation Height Regulations

ADA for 4C Mailboxes

Budget Mailboxes

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Copyright © 2013 Salsbury Industries. All rights reserved. (P/N 370146, Rev. 08, 03/11/2013)