Conducive to daylighting. Unlike the general open (swing or overhang) window type, as long as it is within the front of the open fan, no matter which angle the sun is at, some of the sunlight will enter directly through the opening gap without generating complete glass. Occlusion situation;
Conducive to ventilation. Because there are gaps around the opening fan, it is convenient to form a loop in and out of the air, increasing the amount of ventilation and the amount of fresh air;
Easy to fire and smoke. Also because there is a gap around the opening fan, it will not hinder the exhaust.
The facade is neat. Because the sash is pushed out entirely, it does not have a certain angle with the surrounding like the outer suspension or the flat opening, and the difference in the façade effect (such as inconsistent reflection).

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