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Extra large NFA reduces number of vents required by 2/3 compared to standard 50" vent. Galvanized steel venturi. Industry-leading mesh screen protects against rodents, bird and insects. Suitable for up to 8/12 pitch. Easy to install. Base: 25" x 25". Opening: 15" diameter.

Cool Attic&#174; Galvanized Steel Round Vent, 144" Sq. in NFA, Brown, 1/Pack

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Cool Attic® Steel Large Capacity Round Static Vent, 144 Sq. in NFA, Brown, 1/Pack