Replacement Automatic Foundation Ventilator - Automatically Opens at 70 Deg and Closes at 40 Deg (Approximately). Fits Standard 8" x 16" Vent Openings. Vent Color: Grey. High-Density Thermoplastic Construction with Stainless Steel Metal Parts. No Electrical Hook-up. Heavy-duty Aluminum Mesh Screen - Front and Back. 1 Year Warranty.