1.Heat insulation type material.the heat preservation economizeson energy.

2.Three chamber structure,the strength is high and soundprooflike.

3.Is European standard hardware slot,can assemble to order morelock.

4.Outside open structure ,set x-rated open angle:(15 / 40 / 65degree).

5.Opens a pair of chambers Huo oak to seal completely gum andseals completely without the dual connection.

6.The airness that is superior circulates naturally and createsa living environment of comfort for people.

Wonderful inside open insidepour window KLSL-100002