Metal flue liners type SPS Application Metal positive pressure flue liners type SPS applied to carry off exhaust emissions from both condensing and non-condensing fan-burner boilers with a sealed combustion chamber. Fuel Oil and gas Specification Material acid-proof steel 1.4301 Material thickness 0,5mm Working temperature ≤200 °C (gray seal); ≤120 °C (black seal) Diameter range 60mm, 80mm, 100mm Certificates Technical description Declaration of commercial properties