NorWesCo 558011 17" x 20" Roof RV38 Ventilator, GalvanizedNorWesCo's complete line of galvanized building products are strong, easy to install, and come with a lifelong guarantee of durability.NorWesCo 558011 17" x 20" Roof RV38 Ventilator, Galvanized Features:• Roof-proofed, weatherproofed roof ventilators features include one-piece base, one-piece top with enclosed back, roll-lock seam collar and specially designed weather baffle, all developed to provide the desired venturi-type opening pulls air out of• 38 SQIN Free Area• 8-mesh screen meets FHA requirements• Screen is fastened from-head tight over opening, can't come loose or fall out• Base plate• Galvanized Steel • Size: 17" x 20"*Image may vary by size, material or color
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