New high output chimney is 3" taller than a standard chimney. The increased height means more oxygen is drawn over the flame, resulting in up to 20% more light. Aladdin's exclusive borosilicate glass is shatter resistant and can withstand immense heat. All chimneys carefully inspected and are free of bubbles and other defects. It's the finest lamp chimney available! 15-1/2"H, 2-5/8" OD base. Works with all Lox-On Aladdin models - 12, A, B, C, 21c, 23. IMPORTANT: High Output Chimney is required at altitudes above 4,000 ft. Note: Logo on chimney is white. Note: Measurements are approximate and can vary slightly.