Murkka Passive Fixed is a closed improved selective glass triple glazing unit wood-aluminium window, the frame of which is covered with an aluminium profile. Closed windows have the advantage of permitting building large size windows.
Heat retention:
U-value = 0.78 (VTT estimated, measurement 1230×1480)
Sound insulation:
Rw = 32-41 dB, Ctr = 27-37 dB