• N & I Moroz Solution

• N. T. Jenkins Mfg. Co.

• Naturalite (The Vistawall Group)

• Norco

• Nortek Inc.

• Nortek, Inc

• NuAir Manufacturing

• Oran Industries Ltd.

• PGT Industries

• Palace Of Glass Inc.

• Parrett Mfg

• Peerless Products

• Peterson Window Corp

• Point Five Windows

• Polybau Vinyl Windows and Doors

• Portal

• Pozzi Wood Windows

• Premdor, Inc.

• Pro Tech Associates

• Progressive Glass Technology

• Protective Armored Systems

• Quaker Window Product Co., Inc.

• Quaker Windows & Doors

• Re-View

• Ready Access

• Regal Aluminum (1993)