committee member, a builders association, though supportive of the process and generally in concurrence with the new standard, declined to sign the agreement because a provision of the adopted standard establishes a minimum ratio of parcel lockers to customer compartments. This committee member stated its concerns in a comment submitted on the proposed rule, which the Postal Service will address with the other comments received. Design and installation regulations This new regulation, STD-4C, replaces all previous regulations (4B+, 4B, etc.) and requires STD-4C compliant mailboxes for all new construction and major renovations (defined as any change to the existing opening mailboxes are currently located in). The STD-4C installation requirements include: At least one customer compartment shall be positioned less than 48 inches from the finished floor. No parcel locker compartment (interior bottom shelf) shall be positioned less than 15 inches from the finished floor. No patron (tenant) lock shall be located more than 67 inches above the finished floor. No customer compartment (interior bottom shelf) shall be positioned less than 28 inches from the finished floor. The USPS Arrow lock shall be located between 36 and 48 inches above the finished floor. Changes in Regulations: The new STD-4C specification introduces a new parcel locker requirement of 1:10 – or one parcel locker for every ten mailbox customer compartments. However, this ratio may not be applicable if there is another method of accepting USPS parcel deliveries such as a staffed service desk. The new STD-4C specification enhances security requirements for the entire mailbox receptacle. It requires: Heavier metal materials for construction. Improved tenant lock design, and. Larger compartment form factor: minimum size of 12″w × 15″d × 3″h. to accommodate today's larger mail types and sizes The new specification also eliminates the vertical form factor design. The STD-4C specification also requires powder coated finishes; promoting greater corrosion and weather resistance on all centralized mail delivery equipment. Locking mechanism design specifications are also much stronger, providing added mail and parcel security for the new STD-4C compliant mailboxes. Design enhancements The modular design of STD-4C mailbox systems makes it easier to create wall-mounted layouts. The 4C specification allows for both single and double column modules in varying heights so be sure to check with each manufacturer in order to include the most extensive line of options for your project. Outgoing mail slots are required in each 4C module. This means they can be