NanaWall Systems

Credit: NanaWall Systems, Inc.

What makes this product green?

  • Reduces heating and cooling loads


NanaWall has built its WA67 high-performance folding glass door system to be efficient enough to meet strict Passive HouseA residential building construction standard requiring very low levels of air leakage, very high levels of insulation, and windows with a very low U-factor. Developed in the early 1990s by Bo Adamson and Wolfgang Feist, the standard is now promoted by the Passivhaus Institut in Darmstadt, Germany. To meet the standard, a home must have an infiltration rate no greater than 0.60 AC/H @ 50 pascals, a maximum annual heating energy use of 15 kWh per square meter (4,755 Btu per square foot), a maximum annual cooling energy use of 15 kWh per square meter (1.39 kWh per square foot), and maximum source energy use for all purposes of 120 kWh per square meter (11.1 kWh per square foot). The standard recommends, but does not require, a maximum design heating load of 10 W per square meter and windows with a maximum U-factor of 0.14. The Passivhaus standard was developed for buildings in central and northern Europe; efforts are underway to clarify the best techniques to achieve the standard for buildings in hot climates. standards, making larger expanses of glazingWhen referring to windows or doors, the transparent or translucent layer that transmits light. High-performance glazing may include multiple layers of glass or plastic, low-e coatings, and low-conductivity gas fill. an option on even the most efficient buildings. NanaWall achieves this through the use of argonInert (chemically stable) gas, which, because of its low thermal conductivity, is often used as gas fill between the panes of energy-efficient windows. -filled low-eLow-emissivity coating. Very thin metallic coating on glass or plastic window glazing that permits most of the sun’s short-wave (light) radiation to enter, while blocking up to 90% of the long-wave (heat) radiation. Low-e coatings boost a window’s R-value and reduce its U-factor. triple glazing and thermal breaks. It has an impressive NFRC-certified U-value of 0.17 and a solar heat gain coefficient(SHGC) The fraction of solar gain admitted through a window, expressed as a number between 0 and 1. of 0.26. The WA67 system is offered for openings from three to 39 feet with more than 200 exterior aluminum finishes and numerous wood choices for the inside, including FSCNonprofit organization that promotes forestry practices that are sustainable from environmental and social standpoints; FSC certification on a wood product is an indicator that the wood came from a well-managed forest.-certified wood.

Additional Info

Product Attributes

  • Solar Heat Gain Coefficient: 0.26
  • U Factor: 0.17


  • Forest Stewardship Council (FSC)

Manufacturer Information

NanaWall Systems, Inc.
707 Redwood Hgwy.
Mill Valley, CA 94941
Phone: 415-383-3148
Fax: 415-383-0312
Toll-free: 800-873-5673

Listed in: Glazing