Sealed heat preservation doors and windows adopt side-open closed doors and windows, the structure of which is a steel frame structure compression type. The door, window frame and skeleton are welded by cold-formed open-square steel. The material of the square steel meets the requirements of GB228-87 standard, the panel is 0.6mm color plate, the inner plate is galvanized or color plate, the panel is formed by special pressure groove, and the inner cavity is filled with polystyrene self-extinguishing foam board.
