Thermo-plastic With automatic damper 65 square inch net free area. No electrical hook-up required. Replaces old-style manual vents. Fits standard 8" x 16" vent openings. High-density thermo-plastic construction. The key mechanism, bi-metal coil, fully enclosed in protective cover. Stainless steel compression spring with 1 adjustable screw for easy installation. Automatically opens at 70 degrees fahrenheit and closes at 40 (approximately). Stainless steel and corrosion resistant metal parts. heavy-duty aluminum mesh screen, front and back.

• Size : 8" x 16"

Size : 8" x 16"USA