Overhead door 450A Installation Instructions And Owner's Manual page 9

INSTALLATION
CROSSWISE CEILING JOISTS
2x4
CEILING JOIST
<.~-
CJ.
0
USE FRONT SLOT
FOR BRACING ONLY
LENGTH AS
REQUIRED
FINISHED CEILING
CROSSWISE CEILING JOISTS
HIGH CEILING
~---
20"
C5 .
• r:::-:i
a
USE HOLES FOR
MAIN SUPPORT
rCEILING JOIST
FINISHED CEILING
SWAY BRACE
Brace powerhead as shown for best performance
Page 9