Use the CA-1 when installing a low-profile circular ceiling mounted
sensor (such as the DT-355, CI-355, or UT-355 models) in a 4 in.
square Wiremold V5748-2 j-box on a hard ceiling, or in the opening
of a mudring for a drop ceiling. The CA-1 provides a finished look
by filling in the spaces at the corners and the unused holes.