Features: * With 1 in. wide frame for new construction or to replace old foundation vents * Fits standard 8 in. x 16 in. concrete block opening * Operates automatically without electricity; opens at 70 degrees Fahrenheit, closes at 40 (approximately) * Simple homeowner/DIYer snap-in installation, with color matched set screws for additional stability * Removable back for maintenance and cleaning * Screened completely front and back with 1/8 in. heavy-duty aluminum mesh * High-density thermoplastic construction * All metal parts are corrosion resistant stainless steel * Aluminum louvers * No mortar required for installation * 62 square inch net free area * Gray What"s In The Box: * Witten Automatic Vent 315CGR Gray Plastic Replacement Automatic Vent