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Cast Iron Round Floor, Ceiling, or Wall Grates for Air or Heat Vent. Register Cover With Damper, 12" Hole Size, 14" Overall Diameter (ZM-IR-1201)
Price:$265.00
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Cast Iron Round Floor, Ceiling, or Wall Grates for Air or Heat Vent. Register Cover With Damper, 12
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ZM-IR-1201  Round Cast Iron Grille 12" Hole Size With Damper; 14" Exterior Diameter

Made to fit into a 12" round hole or duct, these grates have an exterior diameter of approximately 1" greater than their boot size.  The flange measures 3/16", and is pictured in the side view photo. You may need to modify for different mounting applications.

None better anywhere at any price.