Impervia Series, Awning Window, Vent Unit, Multi-Wide (2-4) Pella Impervia windows combine the beauty and energy efficiency you expect from Pella with the durability of Duracast material that can withstand extreme heat and subzero cold. Listing Back To Top Design Visualizer Previous Next Design Visualizer 3D You need to be logged in to view & download files. Login/Register New to CADdetails? Register to enjoy full access to unlimited 3D models, CAD drawings and specifications. It's free! Downloads Product Info About Education Media BIM Revit Family Specs Specs Download All Add to Project+ Favorite User Feedback