The OS144PRO is a professional grade 144 watt air treatment system with an airflow sensor that utilizes ultraviolet light to kill odors, mold, bacteria and viruses in HVAC systems. The energy saving airflow sensor turns the unit on only when the HVAC system turns on. It also has LED light that verifies that the unit and bulb are operating properly. It is easy to install and comes with step by step directions with pictures, a cut-out template, mounting screws and foam tape already attached. Simply cut out the template, drill holes, insert unit, plug in and begin enjoying fresh, clean air, that is free from unwanted contaminates. Ultraviolet light is a proven solution for killing all airborne bacteria that is present in HVAC duct work. The OS144PRO system is specifically designed to make indoor environments safer and help people with compromised immune systems, allergies, school-aged children and more. Start breathing better today OS14412PRO - 144 Watt UV Air Treatment System with Airflow Sensor and 12" UV Bulbs available for installation in ducts with less than 16" of depth.