[header] How to avoid carbon monoxide poisoning [title] Perform proper maintenance. [step] Your heating system (including chimneys, ducts, and vents) and your hot water heater should be thoroughly inspected by a qualified technician every year. [title] Keep generators outside. 
[step] Never use a portable generator inside your home or garage, even if the doors and windows are open. Only use generators outside, at least 20 feet away from your doors and windows.