I highly doubt they would, and even if they did the FTC would likely stop the merge. Given how large both companies already are in many fields, the merger would likely cause them to have an unfair market domination. Currently the major brands are Siemens, Carrier, Johnson Controls, and Honeywell. The merging of the two would cause a major shift in how much of the fire alarm market is owned by who, and that’s not even mentioning other markets like HVAC and other building controls.
In addition, I highly doubt that should the merger be allowed, the resulting company would not want to give up on IDNAC given the TrueAlert ES series is the only fully addressable notification appliance in the North American market.