The ETNA Black sauna door by Andres Glass Solutions is an insulated, double-glazed door for saunas where energy efficiency matters as much as design. Its frame is thermal aspen: knot-free, 92 mm deep with hidden finger-jointed corners, and highly resistant to moisture and temperature changes, which helps reduce heat loss and hold the sauna at its optimum temperature. The double-glazed pane also helps prevent condensation. Hidden black hinges, a magnetic lock and a square handle keep the lines clean, and a threshold is included as standard. Choose 8 mm toughened glass in clear or grey, in 7 × 19 (700 × 1900 mm) or 7 × 20 (700 × 2000 mm) sizes; the door arrives fully assembled.