When selecting the model, three key parameters require particular attention: first, the fire resistance rating-national standards mandate a minimum of one hour for Class B windows; second, the sash dimensions and opening mechanism-a sash height of 580 mm combined with a sliding design balances ventilation efficiency with ease of operation; and finally, material properties-the galvanized steel substrate must undergo salt spray testing to verify corrosion resistance, as hardness directly impacts structural stability under high-temperature conditions.
For curved window units, it is essential to verify the manufacturer's capability to fabricate non-standard shapes, thereby avoiding on-site cutting that could compromise the fire-resistant sealing layer.
