VODA 4.9 inches Height Twin Motor Heat Powered Stove Fan [Update Version],for Small Space on Log/Wood Burner/Stove/Fireplace New Specially Designed Fan COMPACT SIZE--9.8 x 4.9 x 4.9 inches,producing the air flow as 210 CFM,suitable for small space of the stove top. WHISPER AND QUIET--2017 new motor and TEG model[UPDATE VERSION].You don't even know this fan is there,but you FEEL the WARMTH! LONGER LIFETIME--There is a Bi-metallic safety device on the base of the fan.If the surface temperature rises above around 350C(660F),the safety device gently elevates the front of the fan to protect the TEG and motors. No BATTERIES OR ELECTRICITY REQUIRED--The stove fan uses heat from the stove surface to spin,adjust its speed automatically with the stove surface temperature.The recommended temperature is 185F - 660F (85C - 350C). ONE YEAR WARRANTY--Offering you a full refund or a brand new replacement in one month,provide spare parts in one year,if you are not satisfied with it.