This heat powered fireplace fan requires no electricity or batteries, just the heat from your stove. No settings are needed and it increases comfort while protecting the motor and thermoelectric module. Pay attention to temperature changes during use. Make your home cozy and efficient with this must-have stove fan. 1、 Product Structure 1. Metal handle 2. Heat sink 3. Bimetallic insulation device 2. Product size: about 11x8x12cm/4.33x3.15x4.72 inches 2、 Specifications 1. Color: Black 2. Power supply equipment: thermoelectric module (thermal power supply) 3. Airflow: Aluminum 4. Airflow: 203CFM 5. Starting temperature: 40 ℃ 6. Working temperature: 50-400 ℃ 7. Noise Performance: 15-18db 8. Recommended distance: 10-15CM Product features: 1. Adjustable automatically: The fireplace fan can start automatically and adjust its speed according to the temperature of the stove. 2. Low energy consumption: Low consumption, high efficiency, can increase room temperature by 41%, save energy costs up to 16%, no need for batteries or power sources, more . 3. The thermoelectric fan of the stove does not use batteries or electricity to improve the heating efficiency of the stove, which can make warm air circulating through your room faster. list: wood burner fan heat powered*1 piece