TOMERSUN Heat Powered 4 Blades Stove Fan Tomersun stove fan requires no electricity or batteries to operate, it uses the heat from your stove to power the fan and efficiently disperses the heat around your room. Why need to use the stove fan Without a stove fan,the heat produced by your stove collects around the stove and escapes up the chimney. With a stove fan,the warm air is circulated into your room more quickly warm up a chilly room. Specifications Size:8.3x 6.3 x 3.6 inches Weight:530g Min.Operating Temperature:55C/131F Max. Operating Temperature:350C/662F Recommended Operating Temperature:80-250C/176-482F Airflow Range:150-180 CFM Noise:.