1. Heat preservation and energy saving: plastic steel profile multi-cavity structure, with good heat insulation performance, low heat transfer coefficient, only 1/357 of steel, 1/1250 of aluminum, significant economic and social benefits.
2. air tightness: plastic steel doors and windows are installed at the gap with rubber sealing strip and wool, air tightness is much higher than aluminum alloy doors and windows.
3. Water tightness: plastic steel profile has a unique multi-cavity structure and an independent drainage cavity, which can effectively discharge the accumulated water in both frame and fan.
