Normal household activities can contribute greatly to household moisture levels. Cooking three meals a day for a family of four can generate 2 to 5 pints of water/day. Dishwashing adds another 1.1 pints per day. Laundry, bathing, houseplants, pets, and combustion appliances all add to moisture levels in the home. Just breathing adds significant moisture to the air. People exhale 1 to nearly 7 pints of water vapor per day into the air depending on whether they are resting, standing, or working. Efficient exhaust fans that remove moisture and odors from kitchens and bathrooms are an important component of a clean, healthy indoor environment. Every home should be equipped with exhaust fans that vent to the outdoors. ENERGY STAR-rated exhaust fans meet performance criteria for energy efficiency and sound levels.