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With 18 in. Lintel for new construction. Fits standard 8 in. x 16 in. Vent openings. High density thermo-plastic 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 in. Net free area. Heavy-duty aluminum mesh screen, front and back.
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