Strong Fine Mesh Screen Extra Strong Galvanized Steel Roof Flange with Mill Finish Dimensions 8.5" Round x 1.5" Deep Vent Color is White Will replace existing Elixir or Ventline. Includes 28 screws and 70" of butyl tape for mounting your roof vent. Products Standard OEM Dimensions (Opening 13.25" x 13.25") Mounting Flange (16.5" x 16.5")