The Honeywell SiXGB mounting specifications is as follows : The SiXGB can be mounted on the wall or on the ceiling:
• Mount the SiXGB within 25 feet of the protected glass
• within clear view of the protected glass
• at least 6.5 feet from the floor
• at least 3.3 feet from forced air ducts
• at least 3.3 feet from sirens or bells greater than 2 inches in diameter
• between the protected glass and any heavy window coverings
• when heavy window coverings are present, the detector can be mounted on the window frame
• Avoid mounting the Honeywell SiXGB detector on the same wall as the protected glass, on free-standing posts or pillars, or in rooms with noisy equipment (air compressors, bells, power tools, etc.), if this equipment is operated when the detector is armed.