The Viking 21 slim line unit is available in both double and triple glazing offering high thermal performance at great value. Internal window profiles are available in traditional and modern styles. This is a popular range for projects where excellent quality and performance is needed, but Passivhaus certification isn't required.
Viking 21 Window (double/triple glazed)
Uw = 1.24 - 0.8 W/m²K (1.23 x 1.48 m opening standard window)
Rw = 33 dB (-1;-4) - with standard glazing