
Measure from the fireplace floor to the top of the front opening. 2. Sizing Guidelines by Valve Type
To determine the right size gas logs to buy, you must measure your fireplace's interior dimensions—specifically the —and then account for mandatory safety clearances based on your chosen control valve system. 1. Essential Measurements
Your log set size is limited by the space required for the burner and its control system. Use these general "subtraction" rules for the front opening width:
Measure from the front opening (behind any lip or ledge) to the back wall.