VEVOR Diesel Heater, 8KW, DC 12V, All in One Portable Diesel Air Heater with Bluetooth APP Control, Remote Control and LCD Screen, 4.5 L Fuel Tank for Vehicles, Vans, RVs, Campers, and Garages

Internal exhaust pipe length: 30cm. External exhaust pipe: 59.5cm. Theoretically, the external exhaust pipe can be extended without restriction, but excessive bending is not permitted (if the bend angle exceeds 90 degrees, prevent hot air backflow causing the heater's high-temperature alarm).