Simple Air, 8 OZ, Dust Fresh Gel, Traps & Removes Unpleasant Odors From The Air, Place Adjacent To HAVC Blower For More Effectiveness, Destroys & Removes Stubborn Odors & Smells From Pets, Smoke, Mold, Mildew, & Musty Odors, For Use In Hospitals, Nursing Homes, Residential, Industrial Or Any Other Space That Needs Refreshing, Effective Up To 6 Months.