Windows and doors must have which features?

• A. Fire resistance rating and thermal break for metal frames
• B. Double glazing and weather seals
• C. Low-e coating and tempered glass
• D. Insulation rating and magnetic catch

Answer: (A)

Opening safety and performance come first: windows and doors in buildings often need to contribute to fire containment as well as control heat transfer. A fire resistance rating is about how long the opening can resist flames and maintain the integrity of a fire-rated wall or door assembly, helping to contain a fire and protect occupants. For metal frames, a thermal break is a non-conductive barrier between interior and exterior frame components, which dramatically reduces heat transfer, improving energy efficiency and reducing condensation and heat loss. Together, these features address both safety and energy performance that codes commonly require for openings in certain locations or rated assemblies.

Other features like double glazing, weather seals, low-e coatings, tempered glass, or magnetic catches are beneficial and common, but they’re not universally required by codes for all windows and doors in the same way that a fire resistance rating and a thermal break for metal frames are.