The duct opening sizes: 11x7'' // Outside Dimensions: 11.8 x 7.87 inch // Made of Steel With Fly Screen Mesh - Protects against: mosquitoes, wasps, flies, spiders, bees, vermin and etc. Internal and external mounting. For sidewall or ceiling application. Durable Grey finish. Designed To Cover Wall Or Ceiling Openings And Ducting Vents We do not know what type of screws you need - so the SCREWS ARE NOT INCLUDED.
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