The Passive House Institute – an independent consulting and research firm that performs research and development of high energy systems – says, "A Passive House is a comprehensive system. 'Passive' describes well this system's underlying receptivity and retention capacity. Working with natural resources, free solar energy is captured and applied efficiently, instead of relying predominantly on 'active' systems to bring a building to 'zero' energy. High performance triple-glazed windows, super-insulation, an airtight building shell, limitation of thermal bridging and balanced energy recovery ventilation make possible extraordinary reductions in energy use and carbon emission" (The Passive House Institute).

The NanaWall WA67 with argon filled Low E triple glazing has a NFRC certified U-value of .17 and a Solar Heat Gain Coefficient of .26. It meets Energy Star requirements for all areas of the US and Canada.

The NanaWall WA67 also provides high water and air resistance. For inswing and outswing models with a raised sill, independent testing indicates that there was no water leakage at 12 psf or 68 miles per hour. Air infiltration is also well below the allowable limit.

The WA67 provides flexible solutions to architectural openings from three to 39 feet. It is available with more than 50 stacking configurations.

The NanaWall WA67 with triple glazing is available in more than 200 aluminum finishes for the outside and different wood choices for the inside including FSC wood.

"NanaWall Systems is the first folding door company to meet Passive House Standards," said Ebrahim Nana, president of NanaWall Systems. "Along with our partner Solarlux, Germany, NanaWall Systems is committed to developing opening glass wall systems for large openings for our customers in the harshest climate conditions – whether a hurricane zone or the coldest spot in Alaska."