Definitions for "Hopper window"
A window hinged on the bottom edge which opens inwards Valraam
A window with a bottom-hinged sash that opens inward for ventilation.
Similar to a pivot window, but with the pivot points located near the bottom of the sash. Advantages include: allows warmer air near the ceiling to escape, brings in fresh replacement air at the sides, helps to minimize drafts at sill levels, and provides easy cleaning access to interior and exterior surfaces.