Yes! all of our gas fireplaces must have the ability to shut off the flow of gas if there is no flame to burn it off. This is where the self generating millivolt system comes in. The millivolts energize a magnetic coil within the gas valve which holds the valve open. Should the pilot flame extinguish, the millivolts will stop generating, releasing the coil and closing the gas valve. Every Napoleon® fireplace we manufacture is tested prior to shipping to ensure a 100% effective system.