... tightness 4.High quality with competitive price Aluminium curtain wall 1. The ability to resist external strong wind .2 ... the building .3. Good air seal on the whole window system.4. Maintain constant room temperature .5. Prevent sound ... drawing draft for customer information.9.Glass: Single glass, Double glass, Clear glass, Tempered glass,, LOW-E glass, Patterned glass, etc.Thanks for your concern ...