AS A MATTER OF FACT, OUR WINDOWS ARE THE BEST 613-838-2211

There is a patio door to suit the style of your home and your budget.
The glass in all North Star doors is double strength or better as a standard feature, and meets or exceeds industry standards. Glass is also available in a variety of attractive and practical options.
| Air tightness | Water resistance | Wind-load resistance | Ease of operation | Forced entry | Energy rating |
| A3 | B3 | C3 | E3 | F2 | +27*/+31** |
| * Energy rating with Low E glass and argon gas. * Canadian ER-Energy rating with Low E glass and argon gas. Patio doors are AAMA tested to an overall rating of LC45 (Light Commercial) and NFRC tested to U.S. energy rating standards. | |||||
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:
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.
North Star stands behinds all of its patio doors with a generous limited lifetime warranty. The benefits of the North Star warranty are also transferable to a subsequent owner.