Vent Free Gas Logs, Ventless Gas Logs, or Unvented Gas Logs, whatever you want to call them these gas logs are efficient. They burn the least amount of gas per hour at 99.99% efficiency rate. PRO-TIP: While you don’t have to open your damper with these logs; we recommend cracking the damper slightly to eliminate any odor or water vapor created during the combustion process. These logs are a great option for those wanting remote controls due to the lower Btu rating and less stress they put on remote systems.