1, broken bridge aluminum doors and windows used hollow glass5 27a 5 double-layer glass, mainly used for broken bridge aluminum 75 series casement window the profiles are used together.
2. The 5 here refers to the thickness of the glass, which is what we usually call five centimeters of glass. The thickness is 5mm, plus or minus two. How big is the gap between the hollow glass composed of two layers of 5cm glass? It is 27mm.
3. The 18 in 5 27a 5 refers to the gap between the two layers of insulating glass, that is, the interval is 27mm, and a is the abbreviation of air in English.
