Carbon monoxide is the one winter-camping danger you can't see, smell or taste. This 6-page guide turns CDC, CPSC, EPA, NFPA and heater-manufacturer guidance into practical camp rules. Use it on your phone or tablet - print only if you want to. The core rule follows the manufacturer: never run a fuel-burning heater while sleeping or unattended, and turn it off and disconnect the fuel before bed. Inside: CO symptoms and risk levels, what can and can't run inside a shelter, CO alarm setup with Kidde's published display specs, snow-blocked exhaust and generator safety, emergency steps, a 'before you light it' checklist, and results from a 16-hour overnight heater test done for research purposes only, not as a recommendation. Instant PDF download, US Letter. Instant PDF downloads are final sale; if a file won't open or doesn't match the preview, email krokemoutdoors@gmail.com within 14 days and we'll fix it or refund you.