MUA's and Other Commercial building vents

No matter how much you maintain and clean the inside of your building, the older it gets the more challenging it becomes to control the odors in the building. High-rise buildings are very complex construction's with multiple air vents, heating, cooling, exchanging and controlling air pressure in the building. Everything from mold, pet dander, bacteria, dust, and viruses collect and are trapped until the duct work is cleaned. When overlooked for years on end the ability to clean them thoroughly diminishes, hence service or inspection is strongly recommended.