Thermal insulation for wooden window and door frames is packed into spaces between inner and outer sections, which are joined to form the self-supporting frames

摘要

The building window or door has thermal insulation to the wooden frames with both the fixed frame and the hinged frame constructed as multi-layer structures. The inner layer and the adjacent layer enclose a hollow space (7,8), which can be packed with thermal insulation while the layers are glued together at their edges, without reducing the strength of the frames.