Pella® Impervia® Fixed Frame Window

  • The design flexibility of fixed aluminum glazing systems with significantly improved energy efficiency.
  • Made with Pella's patented fiberglass material, Duracast, the strongest, most durable material available for windows.*
  • Standard and custom sizes up to 70 square feet.
  • Performance Grade up to PG50.
  • Fiberglass resin windows available in a wide range of shapes and sizes – finished to match Pella Impervia products.

(*In testing performed in accordance with ASTM testing standards, Pella's Duracast has displayed superior performance in strength, ability to withstand extreme heat and cold, and resistance to dents and scratches.)

A local Pella team member is ready to help you with your project.

Features & Options

Sizes and Shapes – Pella Impervia Fixed Frame Window


Built-to-order in 1/8" increments.

Standard and custom sizes up to 143.5".


Special Shapes


Add transoms or adjacent windows for flexible combinations. Save time on your project with factory-mulled configurations.

View window combination information

Design Data

Design data available for egress, vent opening, clear opening, visible glass and frame area.

View design data

Special Shapes

Learn about all Pella Sizes and Shapes