3M Scotch 1.5 in. W X 5 yd L Silver Flue Tape

3M High-Temperature Flue Tape stops hot air leaks where they start - the seams of your heating ducts. This flue tape is heat resistant up to 600?F (315?C).
Not recommended for use on wood-burning stoves
Easily installed
Helps reduce heating costs
Stops leaks from hot air ducts