ULTRA GREEN™ Series Ventilation Fans with ULTRA Smart™ Control Technology continually monitor their performance and adjust motor speed to ensure the air movement you expect is delivered in almost any type of installation. You may not always know the ducting situation, but our ULTRA Smart Control Technology will compensate for less-than-ideal circumstances.
Like our X1 single-speed versions, models featuring our X2 multi-speed control technology also take care of excess humidity and odors. However, when you also need to meet whole-house ventilation requirements, X2 models feature a continuous CFM adjustment dial that allows you to precisely set the airflow as low as 30 CFM to satisfy any inspector or rater. This capability also translates to happy homeowners, as there is no costly overventilating or unhealthy underventilating.
When the homeowner needs to leave the room and turns an X2 multi-speed fan back to the preset, lower continuous level, a timer dial controls how much longer it will run at maximum CFM to clear lingering humidity and odors. Both of these dials only need to be set once. However, if changes are needed in the future, the dials are easily accessible by removing the grille and adjusting the dials with a flathead screwdriver.