North Star doors have been designed and built to withstand extreme weather conditions – not to mention looking attractive and saving energy while doing it. Performance testing by impartial, independent agencies has shown our products meet and exceed industry-accepted standards of excellence. North Star patio doors are one of the first on the market to receive CSA certification.

All North Star patio doors feature:

• AAMA-certified 5 5/8" multi-chambered insulating vinyl profiles
provide maximum energy-efficiency.

• Strong interlocking meeting rails for air tightness.

• Full-perimeter double Ultrafab® weather-strip and bubble
weather-strip provide an effective seal between the door jamb
and the operating panels.

CSA-A440 rates the performance of doors for airtightness, watertightness, wind resistance, condensation resistance, resistance to forced entry, ease of operation and energy rating. When comparing performance, a higher number represents better performance. For example, A3 is better than A1 for air tightness. Energy rating measures the effect a door will have on annual heating costs – the higher the ER number the more energy efficient. A rating of +31 is substantially better than +16.

* Canadian ER-Energy rating with Low-e glass.
**Canadian ER-Energy rating with Low E glass and argon gas.

In addition, North Star patio doors are AAMA tested to an overall rating of LC45 (Light Commercial) and NFRC tested to U.S. energy rating standards.