This section has been further divided by time zone for their manufacturing facilities as most of the companies in this category are regional players. The ones remaining on this page are most likely national players.
08 1581 - Eastern Time Zone Manufacturing
08 1583 - Central Time Zone Manufacturing
08 1585 - Mountain and Pacific Time Zone
Atrium Windows and Doors 
Atrium is one of the largest manufacturers of residential and light commercial vinyl windows and doors in North America. We offer a wide range of quality crafted vinyl window and door products to meet all your design needs. Our national presence and superior distribution system enable us to deliver these performance tested products anywhere you need them.
Kolbe & Kolbe Millwork Co. 
After 60 years, our products are known for superior quality, custom craftsmanship, attention to detail, as well as innovative and unique designs. The extensive product line includes extruded aluminum clad, roll-formed aluminum clad, wood and vinyl windows and doors, as well as fiberglass doors. Available in a wide array of sizes and styles, with many options to choose from.
Pella Corporation 
Encompass by Pella™ vinyl windows and patio doors are an option for many multi-family and other nonresidential projects - either new construction or renovation. They're available in a wide variety of sizes, styles and frame types and provide superior energy efficiency at competitive prices. Best of all they are backed by Pella.
REHAU
High-Performance uPVC Systems. REHAU tilt-turn and casement compression-seal window and door designs offer: U-factors down to 0.21; multiple locking points for optimum air and water tightness; acoustical ratings as high as STC 40; impact resistance as high as DP-65 (HVHZ).
See also: 08 5430 - Fiberglass Windows
Atrium Windows and Doors
Atrium is one of the largest manufacturers of residential and light commercial vinyl windows and doors in North America. We offer a wide range of quality crafted vinyl window and door products to meet all your design needs. Our national presence and superior distribution system enable us to deliver these performance tested products anywhere you need them.
Kolbe & Kolbe Millwork Co.
After 60 years, our products are known for superior quality, custom craftsmanship, attention to detail, as well as innovative and unique designs. The extensive product line includes extruded aluminum clad, roll-formed aluminum clad, wood and vinyl windows and doors, as well as fiberglass doors. Available in a wide array of sizes and styles, with many options to choose from.
Pella Corporation
Encompass by Pella™ vinyl windows and patio doors are an option for many multi-family and other nonresidential projects - either new construction or renovation. They're available in a wide variety of sizes, styles and frame types and provide superior energy efficiency at competitive prices. Best of all they are backed by Pella.
REHAU
High-Performance uPVC Systems. REHAU tilt-turn and casement compression-seal window and door designs offer: U-factors down to 0.21; multiple locking points for optimum air and water tightness; acoustical ratings as high as STC 40; impact resistance as high as DP-65 (HVHZ).