Features: brand new and high quality Eco-Friendly and Self-Powered: Thermoelectric module acts as a small generator to power the fan's motor. No batteries or electricity required! Improved warm air circulation results in greater comfort and reduce wood consumption from your stove. Longer Lifetime: There is a Bi-metal safety device in the base of the fan.If the surface temperature rises above around 300C, the safety device gently elevates the front of the fan to protect the TEG and motor. Save Energy: Efficiently drive warm air throughout the room. Less consumption, more efficiency. Start Automatically: Upgrade technology, faster speed, larger air volume.The heat powered stove fan is designed to circulate the warm air created by a wood, coal or pellet burning. Efficiently circulates warm air throughout the house. Whisper Quiet: Newly Designed Blade,Larger Air Volume,Lower noise.You don'for t even know the stove fan is there,but you feel the warmth!You will enjoy the warm air in a quiet and comfortable environment. Specifications: Material: Aluminum Alloy Color: Black, Silver Product Dimension: approx. 180x110x130x105x80 mm/ 7.09x4.33x5.12x4.13x3.15 inches Net Weight: 980g/ 2.16 lbs Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Fixed Collar Use Note: The coil is suitable for chimneys 5-6 inches in diameter. 1. Use a screwdriver to turn the nut left and right to control the size. 2. Adjust to the right size and fix the fan. Package includes: 1PC 4 Blades Heat Powered Stove Fan