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 
 www.mailboxes.com    engineering@mailboxes.com 
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 © 2017 Salsbury Industries. All rights reserved. (02/10/17) Page 2 of 2 
Installing the Mailbox Unit 
Lifting and installing the mailbox unit into the enclosure is a two (2) 
person operation.   Open appropriate compartment doors  to provide 
handholds.    Lift  the  mailbox  unit  and  carefully  slide  it  into  the 
enclosure  until  the  front  peripheral  flange  is  flush  against  the  front 
flanges of the enclosure. See Fig. 6. 
Fastening Mailbox Unit to Enclosure 
Open the master doors of the mailbox unit until the hold-open rods at 
the top  inside corners of  the doors  engage.  Install Type  B  self-
tapping machine screws (provided) through each counter bored hole 
in the bottom flange of the mailbox and through each slotted hole in 
the vertical flanges on the sides of the mailbox. See Fig. 7, Fig 8A 
and Fig 8B. The number of screws required varies depending on the 
height and width of the unit.  A maximum height double column unit 
is shown. 
Close the master doors. The installation is now complete. 
Type B 
Type B 
LEFT 
MASTER 
DOOR 
RIGHT 
MASTER 
DOOR 
BOTTOM 
Fig. 6 
Fig. 7 
Fig. 8A 
Mounting 
Screw 
Location 
Mounting 
Screw 
Location 
Type B 
Fig. 8B 
4C Free-Standing Horizontal Mailboxes–3900 Series 
Installation Instructions 


