Product Type Ducting, Compatible with Product Type Ducting for Portable Oil & Kerosene Heaters, Compatible Grainger Part Number 6DMP3, 6DMP6, Compatible Mfr. Model Number AR310, AR402, Overall Length 25 ft, Overall Diameter 18 in, Vent Diameter 18 in, Thickness 0.023 in, Maximum Operating Temperature 280 Degrees F, Material TPE Reinforced Laminate, Includes Screw Clamp Cuff on Entry End