Image Credit: NanaWall Systems WA67 specifications for raised-sill installations, in double- and triple-glazed configurations. Other NanaWall systems include triple glazing as an option. The triple-glazed version of the NanaWall WA67 system provides enough airtightness and thermal resistance to make the system an option for Passivhaus projects. Foam insulation is used in the highest-performing versions of the NanaWall WA67 system. NanaWall offers more than 50 stacking options for its folding window systems.
NanaWall Systems is a veteran in the folding-glass-wall business. Launched in 1986, the company significantly expanded its lineup after 1996, when it forged a partnership with Solarlux Technologies, based in Bissendorf, Germany.
NanaWall’s articulated-window systems have found their way into plenty of commercial and residential buildings, and even a few Solar Decathlon homes, including those built by Cornell University, Iowa State University, University of Louisiana at Lafayette, and Team Alberta.
A large opening sealed shut
This week, NanaWall took a step deeper into the deep-energy realm with the announcement that its WA67 product – an aluminum-clad, wood-framed folding system – is now available in a triple-glazed version with foam insulation that will work in buildings designed to meet the Passivhaus standard.
NanaWall says the Passivhaus-ready version of WA67 has a U-factor of 0.17, a solar heat gain coefficient of 0.26, high water resistance (no leakage at 12 pounds per sq. ft.), and air infiltration “well below the allowable limit” for a building constructed to meet the Passivhaus standard.
NanaWall’s WA67 can be built for openings from 3 ft. to 39 ft. wide, with any of more than 50 stacking options. Other NanaWall systems, including one called the SL70, are available with triple glazing, although the SL70’s U-factor is higher (0.29) – in other words, worse – than that for the WA67. The price for this system of course varies according to the dimensions of the opening and the materials requested, but for an opening 7-ft. 10-in. high, the cost would come to roughly $1,000 per linear foot, a company spokesman told GBA.