All aluminum 90 degree air vent adjusts airflow from full open through closed by means of a knurled ring. Mounts by means of .090 x 2-3/8″ aluminum flange with 3 fastener holes on 1-13/16″ centers. Depth behind flange: 1-7/16″. Accepts 1-1/4″ aeroduct. Output 1-1/4″
3.5 ounces