High energy costs. Portability Easily transferred from one area to another. Can not be moved in most instances. Monetary costs as well as time spent can add up. Room pressure Does not change room pressure.
Air is cleaned and recirculated.
Will cause a negative pressure. Air must be replaced. Balance and flow continually affected. Sensors Patented sensor detects airflow required adjusting motor speed to ensure constant airflow. Most systems do not take room conditions into consideration and it becomes questionable if airflow rates are maintained at optimal efficiency.