Cool attic galvanized steel round vent, 144" sq. In nfa, black, 1/pack 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.
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