AIRTIGHTNESS FOR PASSIVE HOUSE WINDOWS
The window frames must be well insulated and fitted with low-e glazings filled with argon or krypton to prevent heat transfer. For most cool-termperate climates, this means a U-value of 0.80 W/(m²K) or less, with g-values around 50% (g-value= total solar transmittance, proportion of the solar energy available for the room).
ThermaDura has proudly achieved the best 3 Blower door test results in New Zealand.
Airtighness: 0.1 ach
Airtighness: 0.22 ach
Blower door tester