casement window
Casement window sashes are attached to the frame with hinges and swing open or shut by pushing or pulling. Windows with a single sash are single casement windows. Double casement windows have a pair of sashes.
Casement window sashes are attached to the frame with hinges and swing open or shut by pushing or pulling. Windows with a single sash are single casement windows. Double casement windows have a pair of sashes.