Salsbury Industries 3703D04ZRU, 3703D04ZRP, 3705S03ZRP, 3705S03ZRU, 3705D08ZRU Installation Manual

4C Recessed Mounted Horizontal Mailboxes – 3700 Series

REAR LOADING Installation Instructions

With its quality design and construction, Salsbury Industries’ 3700 series USPS approved 4C recessed mounted 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.

4C recessed mounted horizontal mailboxes can be
installed either with the included connector kits (see
instructions on pages 2-6) or separately with indi­vidual wall framing (see page 6).

TYPICAL INSTALLATION

PREPARATORY STEPS

Have mailboxes and instructions on hand before

1.
starting wall construction.
Unpack and review contents of shipping cartons.

2.
Gather tenant and parcel locker keys and store in a

3.
secure place.
Read installation instructions document thoroughly.

4.
Determine rough opening size(s).

5.
Determine rough opening location above finished floor.

6.
Determine framing configuration and location.

7.
Procure materials for wall construction.

8.

USPS REGULATIONS

The mailboxes must be installed according to Postal Regulations.

1.

The floor of the lowest patron mailbox shall be no less than 28”
above the finished floor.

2.

The patron lock in the highest mailbox shall be no more than 67” above the
finished floor.

3.

The USPS Arrow lock (master door lock) opening must be a minimum of
36” and a maximum of 48” above the finished floor.

4.

The floor of the lowest parcel locker shall be no less than 15” above the
finished floor.

5.

The master access door(s) must be allowed to open a minimum of 90
degrees with no obstruction.

6.

There must be at least one parcel locker for every ten patron mailboxes in
installations of 10 or more patron mailboxes. Parcel lockers must be a
minimum of 15” high (PL4.5, PL5 and PL6) to meet the 1:10 ratio. Once
this ratio has been met, smaller parcel lockers (PL3 and PL4) may also be
added. There is no requirement for parcel lockers in installations of less
than 10 patron mailboxes, but one or more parcel lockers are recommended.

67” AFF ­HIGHEST
POSITION
FOR PATRON
LOCK

48” AFF ­HIGHEST
POSITION FOR
AT LEAST
(1) PATRON
COMPARTMENT

CARRIER
ACCESS
DOOR LOCK

U.S.P.S. APPROVED

48” AFF

CARRIER DOOR

ACCESS LOCK MUST

FALL BETWEEN

THESE DIMENSIONS

36” AFF

NOTES

Although these mailboxes have been tested and

1.
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.
The mailboxes are shipped fully assembled.

2.
Hardware is included to fasten each unit into a wood

3.
framed wall.
Trim is an integral part of the mailbox assembly. There

4.
is no other snap on trim to install.

Phone: [phone] Int’l Phone: [phone] Fax: [phone] Int’l Fax: [phone]

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 © 2015 Salsbury Industries. All rights reserved. (Rev. 20, 02/10/2017)

1010 East 62nd Street, Los Angeles, CA 90001-1598

www.mailboxes.com [e-mail]

28” AFF ­LOWEST
PATRON
SHELF
SURFACE

15” AFF ­LOWEST
PARCEL
LOCKER
SHELF
SURFACE

FINISHED
FLOOR

SALSBURY INDUSTRIES

Page 1 of 6

4C Recessed Mounted Horizontal Mailboxes – Connector Kit

Rear Loading Unit Installation Instructions

Rough Opening

Height: See chart on page 6.

Width: To establish the size of the rough opening(s) in the wall(s) you
will be installing your mailbox configuration(s) into, calculate the overall
width of the total amount of units per wall installation; then subtract 3/4”
from the width grand total.

Example: (2) double-colum mailboxes are to be installed.

• Each unit is 31-1/8” wide x 2 units = 62-1/4”

• 62-1/4” - 3/4” = 61-1/2” required for rough opening.

STEP 1

Place the first unit into the rough opening (see figure 1). Open the master door panel(s) (see figures A-C below).

Figure 1

Hardware required for installation

-#8 square drive x 2” long
wood screws
(provided with mailbox)

-Connector #8 x 1/2” pan head self
tapping machine screws (provided
with each 4C Connector Kit)

Connector bar
corresponds to
unit height

Open the right master door panel until it

engages the locking position (see gure

A). While preventing the two front master
doors from fully closing together, remove
the cardboard strip divider.

Unlocking
hole on
front of unit

To open the left master

door panel, insert a at-

head screwdriver into the
center locking hole (see

gure B) and push up to

pry the locking mechanism
upward; thus unlocking
the left master door panel.
Open the left master door
panel until it engages the
locking position.

Figure B Figure C

Figure A

Unlocking
hole on
rear of unit

If both master door panels
become fully closed, locate
the unlocking hole located
on the back of the unit.

Insert a at-head screw-

driver through one of the

unlocking holes (see gure

C) and push upward as
noted above to open the
master door panels.

1010 East 62nd Street, Los Angeles, CA 90001-1598

SALSBURY INDUSTRIES

Phone: [phone] Int’l Phone: [phone] Fax: [phone] Int’l Fax: [phone]

www.mailboxes.com [e-mail]

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 © 2015 Salsbury Industries. All rights reserved. (Rev. 20, 02/10/2017)

Page 2 of 6