Firestop Pillows, Sheets & Wraps are passive fire protection items and it helps to prevent the spread of fire, smoke and toxic gases.
3M™ 7010353046 Flexible Lightweight Duct Wrap Collar, 25 ft L x 6 in W, 2 hr Fire Rating, Vitreous Spun Fiber, ASTM E 2336, ASTM E 814