Clean Air Duct Freshener is one of the most effective ways to enjoy fresh, clean air. Mold, mildew, and algae can produce foul odors. These fresh air offenders hide in your vents, duct work, evaporator core, and drain pain area. Clean Air Duct Freshener has an easy-to-use spray nozzle that aims the powerful formula directly at them. This special solution eliminates the odors and restores a clean fresh scent every time your turn your blower on. Not a mask or cover-up!Federal regulations prohibit the shipment of aerosol products by air. This item is shipped by Ground only.