CE Approved. According to ISO/DIS 12216. LE,LO&LR type are approved for Area III, IV, designs for craft type "any".316 stainless steel machined rolled ports. 316 stainless steel machine stamped frames. Hand polished and electro polished to provide long lasting protection against corrosion.Weather resistant themo-plastic NEOPRENE gasket.High Strength tempered glass.Optional fiberglass screens with rubber gaskets to ensure a tight fit on the opening port.