What is a hinged door or window? What is a hanging window? What is an inward opening and inward reversing window? What is a fixed window?

What is the Heat transfer coefficient of ordinary aluminum alloy doors and windows?

What is the warranty period for insulating glass? What situations are within the warranty scope and what situations are not within the warranty scope?

What is a system door and window? Where did it originate?

What is the wall thickness of aluminum alloy window profiles? What is the wall thickness of aluminum alloy door profiles?

What is LOW-E glass? What are its advantages?

What is laminated glass? When is laminated glass used?

What is the K value for aluminum doors and windows with broken bridges?

What is the difference between building curtain walls and window walls (external windows)?

What are the open types of windows?