DEI’s Ultra Block is the ultimate heat and noise barrier, engineered to reduce extreme temperatures and unwanted sound in even the toughest environments. Designed to withstand intense conditions, Ultra Block effectively shields against heat and dampens noise from generators, under-hood areas, and more. Perfect as a hood liner or for any high-heat, high-noise application, Ultra Block helps create a quieter, cooler, and more comfortable experience. Enhance performance, protect components, and enjoy peace of mind. Lightweight, open cell, acoustic foam with reflective mylar face that reflects heat up to 428°F Easy install with aggressive adhesive backing - Just peel & stick Excellent flammability resistance* - meets the requirements of FAR 25.856(a) Perfect for lining generator boxes and other closed, confined areas where heat and noise are issues Measures 48” x 48” and 9/16" thick Thickness: 9/16 inch Thickness: 14mm