This product was designed to make it easier to install ducts in wall cavities. Thermo-Stack flashing consists of a precision die-cut support frame that fits over the wall plate, holding the wall stack evenly spaced between studs. Installed, it forms a tight seal to eliminate air leaks, company officials say. Pre-punched screw holes in the 26-gauge steel make installation quicker. The product is available for oval and rectangular duct.
Thermo Manufacturing Inc., 3709 Columbus Road NE. Canton, OH 44705; (888) 678-3709; fax (330) 453-2915.