"Require Glass Only – There are two Glass requirement .

Diameter of glass is 390mm.

Thickness of glass should be 15 mm for one glass and 6 mm for second glass.

Glass has to be Fire resistant as Side Scuttle is Fire Retardent with A-60 notation." FIRE RETARDING SIDE SCUTTLE GLASS FOR GYMNASIUM JIANGYIN HUANGSHAN.A-60.49.00