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COMPATIBLE WITH 27.8 x 17.8 CM DUCTING: Fits duct openings up to 278 x 178 mm OR SMALLER. Overall dimensions: 300 x 200 mm. Screw hole spacing is 288 x 188 mm. Designed to cover wall or ceiling openings and ducting vents, for house as a foundation vent or gable vent. Adjustable Vent. Manufactured of steel // Quality Metal Air Vent Covers - Soffit vents No screws included, but it has easy surface mounting Internal and external mounting // Designed To Cover Wall Or Ceiling Openings And Ducting Vents - For Ceiling And Sidewall Powder-Coat Finish - Smooth, Shiny, Scratch-Resistant, Beautiful