Air tightness

Air tightness. All cracks of UPVC Windows&Doors are equipped with rubber and plastic sealing strips and wool strips, so their air tightness is much higher than aluminum alloy doors and Windows. The air tightness of UPVC Casement Windows is higher than that of push-pull Windows. Under normal circumstances, the air tightness of casement window can reach five levels, and the push-pull window can reach two levels.