I. Solid upgrade, aluminum width is 70mm, inner wall thickness is 1.4mm,U-shaped nylon strip.
2. Sound insulation upgrade, can be made into three layers hollow glass and double glazing unit. The maximum width of the sound insulation air layer can be 22mm.
3. Thermal insulation upgrade, U-shaped thermal insulation strip, width up to 25mm, greatly reducing thermal conductivity.
IV. Energy saving upgrade, no heat conduction and more sealing, saving the use of heating live air conditioning.