Pierre C Belarge said:
The Kidde system with 18 devices is still limited to 12 smokes.
The kiddie system is not limited to 12, it has support for up to 24 devices and is limited to 18 initating devices as i stated earlier.
From the Kiddie instruction pages (that i linked):
UTHA / UTGT Compliant
Smoke Alarm
• Model 1296
A maximum of 24 Kidde devices can
be interconnected in a multiple station arrangement. The interconnect system
must not exceed the NFPA (National Fire Protection Association) limit of 18
initiating devices (Smoke, heat, CO, etc) interconnected, it is still possible to
interconnect 6 strobe lights and or relay modules.