Use it to push heat away from your fireplace or stove and to where it can be enjoyed. 160 cubic feet per minute. Adjustable thermal switch & speed control Included. Country of origin: United States. Speed Control ^ Thermal Switch. Deluxe 15 Overall specifications. FB15DLX (12 Blower Wheel). Quiet Fireplace Blower. 15 Speed Control & Adjustable Thermal Switch. 1.6 Sones. Dimensions? 15 x 4 x 4 inches. 4.1 Pounds. Fireplace Blower Motor with Speed Control & Adjustable Thermal Switch, 160 CFM, 15. 15 inch universal fireplace blower insert fits many different models. The switch will activate the blower once the fireplaces gets warm and deactivate it once it gets cool. The exact temperature that the switch turns the blower on or off is adjustable from 90-140f. The pre-wired Speed control allows you to adjust the fan Speed to find the right balance of air flow and quiet operation. Thank You for Shopping!