... our FRP single-frame, two glass casement window is only K0 = 2.2W / (m2 • k), which satisfy the level 8 of ... thermal conductivity of single-frame, three glass, casement window is K0 = 1.8W / (m2 • k) which satisfy the level 9 of ... of single-frame, three glass, low-E casement window is K0 = 1.3W / (m2 • k) which satisfy the level 10 of ...