Thermo-Stack flashing consists of precision die-cut support frame that fits over the wall plate, holding the wall stack evenly spaced between studs. When installed, it forms a tight seal to eliminate air leaks. Pre-punched screw holes in the 26-gauge steel allow for quick installation and the product is available for oval and rectangular ductwork in seven different sizes.

Thermo Manufacturing, 3709 Columbus Road NE, Canton, OH 44705; (888) 678-3709; fax (888) 678-8711.