Features: * With 18 in. lintel for new construction * Fits standard 8 in. x 16 in. vent openings * High density thermoplastic construction * Automatically opens at 70 degrees Fahrenheit, closes at 40 (approximately) * Key working mechanism, bi-metal coil, fully enclosed by protective cover * No electrical hook-up required * Stainless steel and corrosion resistant metal parts * 62 square inches net free area * Heavy-duty aluminum mesh screen, front and back What"s In The Box: * Witten Automatic Vent A-ELBROWN Automatic Plastic Foundation Vent, Brown