BSTFLEX preheater air duct hose and warm air ducting products are designed for flexible hot air transfer, engine intake preheating, diesel air heater systems and automotive heat protection applications. The series includes PAP paper aluminum air ducting, APK warm air ducting, aluminum foil duct hose, kraft paper aluminum duct hose and multi-layer heat protection tubes.

These flexible duct hoses can be used between the air cleaner and exhaust manifold for intake air preheating, as hot air ducting for diesel heaters, or as lightweight warm air transfer tubes in vehicles, boats, caravans, trucks, generator sets and industrial equipment. Different constructions are available, including aluminum foil, kraft paper, glass fiber, PVC film and insulation layers, depending on temperature, flexibility, abrasion resistance and installation requirements.

Custom inside diameter, length, color, wall structure and packaging are available for OEM, aftermarket and industrial heating applications.