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.
The alarm points on carbon monoxide detectors are not a simple alarm level (as in smoke detectors) but are a concentration-time function. At lower concentrations (e.g. 100 parts per million) the detector will not sound an alarm for many tens of minutes.