Frame is made out of 18 G. Pressed CR Sheets, size of the frame 90 x 90mm. single rebated. Shutter is made out of 20G. CR Sheet.With internal stiffeners. With vision panels. Duly metal primer spray painted.  

Clear Opening:

700mm x 2000mm double leaf
800mm x 2000mm double leaf
900mm x 2000mm double leaf.

Also available in Stainless Steel.