Installation Guide
SALSBURY INDUSTRIES
1010 East 62
nd
Street, Los Angeles, CA 90001-1598
Ph: 1-800-624-5269 Int’l Ph: 323-846-6700
Fx: 1-800-624-5299 Int’l Fx:
323-846-6800
Installation instructions are provided as general guidelines. It is advised that a professional installer be consulted. Salsbury Industries assumes no product assembly or installation liability.
Copyright © 2012 Salsbury Industries. All rights reserved. (P/N 370139, Rev. 17, 3/27/12) Page 1 of 4
4C Horizontal Mailboxes – 3700 Series
REAR LOADING Installation Instructions
U.S.P.S. APPROVED
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.
Illustration 1 - Typical Installation
Preparatory Steps
1. Have mailboxes and instructions on hand before starting wall
construction.
2. Unpack and review contents of shipping cartons.
3. Gather tenant and parcel locker keys and store in a secure place.
4. Read installation instructions document thoroughly.
5. Determine rough opening size(s).
6. Determine rough opening location above finished floor.
7. Determine framing configuration and location.
8. Procure materials for wall construction.
Rough Opening Dimensions
Each unit requires a separate opening. Each pair of units will have a
2x4 stud and (2) 2x2 studs separating them. The trim frames cannot
be butted together. There will be a space between edges of trim
frames of approximately ¾”.
Calculation Of Space Required for Multiple Units
For overall width of the installation, add all of the stud spacings and
subtract ¾”. For overall height of units, see chart in next column.
Wall Construction
Particular attention must be paid to wall framing to provide a strong
and secure attachment of the mailbox units. Stud spacing must be
accurate to ensure that there is minimum space between the studs
and the mailbox frame and minimum mailbox frame distortion when
the fasteners are tightened between the frame and the studs. Studs
must be installed plumb and square to further ensure proper fit of the
mailboxes.
Dimensions – REAR LOADING
WIDTHS 1 COLUMN 2 COLUMN
Overall 16-3/8” 31-1/8”
Rough Opening 15-5/8” 30-3/8”
Stud Spacing 17-1/8” 31-7/8”
HEIGHTS OVERALL ROUGH OPENING
Maximum Height 56-3/4” 56”
15 Doors High 55” 54-1/4”
13 Doors High 48” 47-1/4”
11 Doors High 41” 40-1/4”
9 Doors High 34” 33-1/4”
7 Doors High 27” 26-1/4”
5 Doors High 20” 19-1/4”
3 Doors High 13” 12-1/4”
Notes
1. Although these mailboxes have been tested and approved for
both outdoor and indoor use, some shelter from direct weather
conditions should be provided, especially in areas with heavy rainfall.
This provides protection for the mail, the delivery personnel, and the
mail patrons.
2. The mailboxes are shipped fully assembled.
3. Hardware is included to fasten each unit into a wood framed wall.
4. Trim is an integral part of the mailbox assembly. There is no
other snap-on trim to install.