1. The frame and shutter are PVC with a thickness of 10mmand a width of 50mm ; The counterweight plate is flat steelgalvanized , with a thickness of 8mm and a width of 40mm .The length is determined according to the height of theshutter ; Outer frame PVC;
2. The width of the blade is 163 mm and the thickness is 20mm . Each fan leaf has a sealing strip made of rubber ; Thehandle of fan leaf is made of ABS : Material of tensionspring of accessories : stainless steel;
3. 6 shutter leaves , standard configuration ( 2 counterweights ,1 tension spring ) , opening requires 60N tension , and thestroke is 18cm