BUILDER SERIES 36” Cottage direct vent fireplaces are an economical system with all the latest technology and AFUE Heater Rating. Standard features include rolled louvers, tough texture powder coating, and convenient, dual access pre-wired electrical “J” box. Cottage models are available in both top and rear vent configurations, and feature beautiful new combination split oak ceramic fiber gas logs with multi-tiered flame patterns and glowing ember beds for an outstanding flame presentation. BTU range is 15,000 to 20,000 for both fuel types.