TempGuard™ is a built-in safety feature that senses excessive heat. The fan speed will automatically adjust to high when the internal temperature exceeds 130°F ACT Airflow Control Technology™ (ACT™) is an exclusive feature built into specific Zephyr hoods which can limit the maximum blower CFM to meet local code requirements. TruHue™ A bright idea: customize your hood's light to harmonize with the rest of your kitchen's lighting at the touch of a button-from 2700K, 3000K, 3500K, 4000K to 5000K. Optional Trim Kit Comes included. Install around the perimeter of the insert to hide uneven gaps in the cabinet cutout.