Find a store Request an appointment Request literature Duracast Email to a friend Installation Instructions Size Charts Architectural Information Pella® Impervia® products come in a variety of styles. Non-Duracast® special shapes made of fiberglass resin are available to compliment your Pella® Impervia® products. 3/4" aluminum grilles-between-the-glass — available in a variety of patterns including custom. Color matches frame. 1-5/8" applied muntins for fixed frame windows — available in a variety of patterns including custom. Color matches frame. Easy cleaning Venting windows include one removable sash, so you can clean the interior and exterior of the window from inside. Size options Wide selection of standard and custom sizes to fit all your replacement needs. Glass options Choose from: clear insulating glass; energy-saving, argon-filled, Low-E glass; or obscure privacy glass. Tempered glass is also available. Hardware Finishes Standard hardware is finished to match the prefinished interior of the window or patio door. Bright Brass, Satin Nickel, and Oil-Rubbed Bronze1 finishes are also available. 1 Oil-Rubbed Bronze is a living finish that will develop its own unique patina with use. ©2005 Pella Corporation. All Rights Reserved Privacy Policy.