Polaris

Fenestra Polaris is a pivoting openable twin frame quadruple glazed wood-aluminium window. The external sash and frame are made of aluminium.  
 
Heat retention:
U-value 0.72 (VTT estimated, measurement 1230x1480)
 
Sound insulation:
Rw = 44-47 dB, Ctr = 39-43 dB
 
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