We have hired Exova, a top materials testing company, to conduct an evaluation on the performance of our Solar Powered Attic Vents.Homeowner's Choice / Roofers and Builders ChoiceSolar attic fans are the latest innovation in attic ventilation and it is not just homeowners who are seeing the tremendous benefits.Here are some of the reasons why solar attic fans are everybody's No.1 choice when it comes to attic ventilation. Solar attic fans choice >>4 Seasons HP Solar Attic FanThe 4 Seasons HP Solar Attic Fan is designed and built specifically for Canadian weather. It can withstand weather conditions such as strong winds, hail and freezing rain. more... See more text