The air we breathe can make us sick. We spent many hours in an enclosed environment. The air handling unit “AHU” in the building provides us the thermal comfort, controls the humidity and captures the airborne particulates and pollutants through the filters system. Once this filter is overloaded with debris and pollutants, they can no longer capture the particles and the environment occupants now become the filter, breathing in a high level of particulate which can have short and long term effects on our health. The black soil-like stain on the supply diffusers is a telltale sign that the system and the duct are badly contaminated and need a thorough cleaning is long overdue. Big Red has the knowledge, expertise, and capability to remove all the debris, contaminant and ensure such build-up does not occur over time by having a preventive maintenance schedule.