Tribute Direct Vent Gas Fireplaces Model 36CDVXRRN 36CDVXTRN BTU 14,700 - 21,000 (NG) 15,700 - 21,000 (LP) 14,700 - 21,000 (NG) 15,750 - 21,000 (LP) EnerGuide Ratings Fireplace Efficiency 66.9% NG / 66.9% LP 57% NG / 57% LP AFUE by D.O.E Ratings 63% NG / LP 63% NG / LP Steady State Rating (with fan on) 76.5% NG / 78% LP 76.
