Certified as per: Wind: Class B3 (1.2 kpa) as per BSEN12210 Water: Class 5A (200 pa) as per BSEN12208 Air: Class 3 (600 pa) as per BSEN12207 Your window’s WiWA© score will change depending on where you live and other conditions like the type of your house (a bungalow or an apartment). Find out the right WiWA© score your window needs and ensure superior protection for your loved ones.