Designed for the professional contractor and DIYer, Duck Brand HVAC Duct Sealing Tape is a durable, heavy-duty tape that works on both rigid and flexible ductwork. With durable construction combining the protective benefits of aluminum with the superior adhesive of Duck Brand duct tape, this flex foil tape is ideal for sealing both cold and hot air ducts. This silver adhesive tape is approved for use on metal air ducts and for working with a broad range of temperatures for flexible and rigid ducting. Just apply Duck Brand HVAC Duct Sealing Tape in strips along open or overlapping seams between duct paneling, joints, vents, and more. The Duck Brand has been delighting consumers with quality products for over 20 years and continues to innovate and offer solutions for the household.