More 22++ Gas Fireplace Vent Open Or Closed
More 22++ Gas Fireplace Vent Open Or Closed. You must leave it open!!! We are new to fireplaces and have no idea if these logs are vented or ventfree. Ventless gas fireplaces differ from vented gas fireplaces in terms of the logs, flame pattern, and method of venting. Opening a fireplace damper depends on the model of the fireplace, but generally there is a lever that slides back and forth to open and close it.