Product Description Size: As shown Material: aluminium Noise: 25dB Speed: 1100 rpm Start temperature: 140 F to 60 C Working temperature range: 140 F, 60 C, 662 F, 350 C Blades number: 5 Package includes: 1*5 blades Features: This oven fan is operated by converting heat into energy without using battery or electricity. The working temperature range is approximately: 140 F to 60 C to 662 F to 350 C, higher the temperature, faster it starts to rotate. Can circulate heat through the ro om. This stove fan is quiet and quiet. Attention: The temperature cannot be higher than 662F when using the oven fan. Note: Please allow 1-3cm error due to manual measurement and make sure you don't mind before ordering. Please understand that colors chromatic aberration may exist as the different placement of images.