Before you turn on your furnace this season have Garthside Ltd come in and clean your ductwork! Dust, dirt, pollen, animal dander and other airborne contaminants are pulled into your duct system every time the furnace or air conditioner runs. These contaminants build up inside the ductwork over time and can help make your duct system an ideal breeding ground for mold spores, bacteria, fungus, mildew and other microbes. when you turn on your furnace these contaminants are released! www.penetang.com/garthside