Open-mounted hinges: It is a common external hardware. The advantage is that it has strong load-bearing capacity. It is suitable for casement windows/inner inverted windows with a width ≥ 60cm and a larger weight; it is convenient to install and maintain, and has high cost performance. The disadvantage is that metal parts can be seen in the appearance., Has a certain impact on the overall minimalist style.

Hidden hinge: installed on the inner side of the window sash, completely invisible after closing the window, with high aesthetics, and can reduce rain erosion and prolong life; but the price is 30% ~ 50% more expensive than the open installation, which requires higher installation accuracy and is more suitable for windows with narrow borders and pursuit of minimal color value.