... insulationBrief introduction as follows: 1, Best insulation thermal function in appearance and cost2, Mold resistant and antimicrobial product protection3 ... noise blocking 4, Longer lasting, more durable, easier to clean than fiber glass 5, Easy for construction; 6, Environmental ... 20mm-25mm-30mm-32mm, covered with aluminum foilwidely used in HVAC systems, air duct insulation, gluewater (GW: 10kg/pcs) ...