High Temperature Hose (NFC-6.5): Should your application involve temperatures reaching 1200° F in continuous-use operations, or 1380° F for short-term use applications, we’ve got you covered here too. Our NFC-6.5 line of High Temperature Exhaust Hoses are suitable for use in both scenarios. They’re made of asbestos and silicon-free high temp fabric, and are offered in 6″and 8″ diameters, and in lengths of 8′ and 16′.