Internorm Passivhaus Windows

Credit: Holz & Form

What makes this product green?

  • Reduces heating and cooling loads


British manufacturer Internorm makes high-performance wood-aluminum composite windows, including some certified by the PassivhausA 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. Institut to meet its standards for airtightness and thermal performance. These double- and triple-glazed windows achieve U-factors as low as 0.11. These windows use wood on the inside, insulating foam in the middle, and aluminum on the outside for weather resistance, and are available with interpane blinds. The sealed units, filled with argonInert (chemically stable) gas, which, because of its low thermal conductivity, is often used as gas fill between the panes of energy-efficient windows. or kryptonA colorless, odorless inert gas, often used with argon in fluorescent lighting and sometimes used as gas fill in high-performance glazing., are as wide as 48 mm for increased thermal performance. The frames are available in spruce and larch and five sash designs. Silicone gasketing and a multi-step profile create a triple-seal for superior airtightness. The company also offers a vinylCommon term for polyvinyl chloride (PVC). In chemistry, vinyl refers to a carbon-and-hydrogen group (H2C=CH–) that attaches to another functional group, such as chlorine (vinyl chloride) or acetate (vinyl acetate). window, the KF400, with an energy-recovery ventilator (ERV(ERV). The part of a balanced ventilation system that captures water vapor and heat from one airstream to condition another. In cold climates, water vapor captured from the outgoing airstream by ERVs can humidify incoming air. In hot-humid climates, ERVs can help maintain (but not reduce) the interior relative humidity as outside air is conditioned by the ERV.) built into the frame.

Manufacturer Information

Holz & Form
9005 Shougnessyc St.
Vancouver, BC V5Z 4A1

Listed in: Wood Windows