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Our Salvo Metal Works #502 low-profile 16 oz. copper air vent for ventilating roofs is a heavy-duty soldered and riveted work of art. The outside flashing dimensions are 18" x 20" and the vent opening is 8" in diameter. The ventilation hole is covered by a copper insect screen. This is a beautifully hand-crafted solid copper flashing. Weight is 4.9 pounds. Made in the USA.