Manual folding window

Narrow kitchen windows: If a sink or stove is in front of the window, casement windows will collide with the faucet, while sliding windows waste 50% of the opening. Lift-up windows open vertically so they don't interfere with the countertop.
High bathroom windows: Located above the ceiling or bathroom cabinet, they open vertically without hitting your head.
Narrow balcony side walls: Located close to the wall or cabinet, they open without taking up space.
High sealing requirements
Street-facing residences: Excellent sound insulation, effectively blocking traffic noise (measured sound insulation is 5-10 decibels higher than sliding windows).
In areas prone to heavy rain: Multiple sealing strips prevent rainwater infiltration (especially suitable for external installation).
Air-conditioned rooms/underfloor heating rooms: Excellent thermal insulation (low K value), reducing energy loss.