Witten 8 In. x 16 In. Black Automatic Foundation Ventilator with Lintel

Automatically opens at 70 degrees and closes at 40 degrees. Key working mechanism, bi-metal coil, fully enclosed by protective cover. High-density thermo plastic construction with stainless steel metal parts. Built-in lintel. No electrical hook-up. Heavy-duty aluminum mesh screen, front and back.1 year warranty.