... Features: Maximum operating temperature 900 °C, using the Fe-Cr-Al or Ni-Cr resistance wire as ... to complete about 30-60 seconds,the infrared wavelength range 2-4 μ, the average life of 30,000 hours ... .There are three sizes, 8.5 × 17mm, 11 × 23mm and 15 ... × 33mmmaximum length of up to 4M, all power, voltage and lengthaccording to customer demand ...