2 Position Outdoor Air Damper Can Be Used In Either A Vertical or Horizontal Airflow Configuration, The Damper Assembly Can Be Adjusted to Allow From 25 to 100 Outdoor Air for The Applicable Rooftop Unit, For 12.5 Ton to 15 Ton Units, Contains The Following:(2)Hood Side,(1)Hood Top,(1)Hood Divider,(2)Aluminum Filters,(1)Filter Divider,(2)Rain Shield Angles,(1)Bottom Panel,(1)Damper Assembly,(1)Hardware Bag,Weight:80 Lbs, Origin:Unknown