• Fulton Windows

• GE Polymershapes Insulgard

• General Aluminum Corp.

• Gerkin Windows & Doors

• Glass Block Designs, Inc.

• Gordon Aluminum Industries, Inc.

• Graham Architectural Products

• Groupe Bocenor Inc.

• H Window Company

• HK Kinlong Construction Hardware (Group) Co. Ltd.

• Hankins & Johann, Inc.

• Hansa-Sealand Ltd.

• Hardwoods Supply, Inc.

• Harvard Products, Inc.

• Harvey Building Products

• Hayfield Window & Door, Inc

• Hendersonville Aluminum Corp.

• Henselstone Window & Door Systems, Inc.

• Heritage Window and Door, Inc.

• Historical Arts & Casting, Inc.

• Horton Automatic Doors

• Humphrey Products

• Humphrey Products

• Hurd Windows and Doors

• Hy-Lite Block Windows

• IBP Glass Block Grid System