 During cold winter months, it's important to protect your family from deadly carbon monoxide poisoning. Carbon monoxide, or CO, is called the invisible killer. You cannot see or smell it. This poisonous gas can come from your fuel-burning household appliances, including furnaces, fireplaces, and portable generators. Here are some tips to avoid carbon monoxide poisoning. Never use portable generators inside your home, basement or garage. CO from generators can quickly build up and kill you and your family in minutes. Only use generators outside your home at least 20 feet away from windows, doors, and vents. Never leave the car running in a garage, even with the garage door open. Have your heating system inspected and serviced every year by a professional. Make sure your fireplace damper is open while you are using the fireplace. Keep it open until the ashes are cool. Install carbon monoxide alarms on every level of your home and outside sleeping areas. If you experience a headache, fatigue, nausea, or vomiting, get outside immediately for fresh air. Then call 911. From all of us at CPSC, stay warm, safe, and healthy this winter season.