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  • The vertical side or edge of a doorway, window, or other opening. Source: Water Management Guide
  • A flexible, short, U-shaped duct (typically 10-inch diameter) that connects a room to a common space as a pressure balancing mechanism. Jump ducts serve the same function as transfer grilles. Used when return ducts are not located in every room. Source: Info-604: Transfer Ducts and Grilles;(...)