Superior 2-Piece Variable Speed Heat Activated Blower Kit for DRL4060, DRL4072 and DRL4084 Gas FireplacesThe blowers are installed beneath the rear of firebox. When the fireplace reaches operating temperature, the thermal switch will turn on the blowers. What's Included 2 pc. Blower Kits Features Variable Speed Heat Activated Two piece blower kit Optional accessory Specifically designed for use with Superior DRL4060, DRL4072, and DRL4084 Direct Vent Gas Fireplaces Note: Blower use is not compatible with a see through application. Specifications Model