Pella® Impervia® Fixed Frame Window

  • The design flexibility of fixed aluminum glazing systems with significantly improved energy efficiency.
  • Special Shapes are non-Duracast fiberglass resin windows in a wide range of shapes and sizes – finished to match Pella Impervia products.
  • Standard and custom sizes up to 11' 11-1/2" x 6' 11-1/2" for 2- and 3-wide; sizes up to 6' 11-1/2" x 11' 11-1/2" for 2- and 3-high.
  • Performance Grade up to PG50.

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 1/4" increments.


Special Shapes


Add transoms or adjacent windows for flexible combinations.

View window combinations

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