Similar to other poncho-like garments in Latin America, a ruana is basically a very thick, soft and sleeveless square or rectangular blanket with an opening in the center for the head to go through with a slit down the front to the hem. A ruana may or may not come with a hood to cover the head.
The International Association of Fire Chiefs recommend a carbon monoxide detector on every floor of your home, including the basement. A detector should be located within 10 feet of each bedroom door and there should be one near or over any attached garage. Each detector should be replaced every five to six years.
Avoidance. Of course the best case scenario is that you avoid carbon monoxide poisoning entirely. The best way to do this is with a carbon monoxide detector which you can get from most supermarkets and general stores. By testing each room over night you can identify a possible problem and thus take action to track the source of the problem and have it repaired.