The REHAU System 4500 Bi-Fold Door Design is a premium solution for spaces that need a wide, unobstructed opening. It can be an alternative to hinged and sliding patio doors, but can also be used to accentuate open plan living. Whether for residential or commercial applications, this unique door design allows sash panels to fold to either side, creating a wide opening without any interruption.

This versatile door design uses compression seal technology for superior sound, air and water performance.

Matching windows in a variety of configurations are available.

The system is available in white, beige or clay and can be laminated with solid color or wood-grain foils.


  • Large glazing capacity of up to 1 3/8 in for improved energy efficiency and acoustical properties.
  • Multiple locking points and compression seals all around the sash perimeter for water tightness, minimal air infiltration, security and good sound insulation.
  • Large reinforcement chambers in the sash for sash sizes as large as 7 ½ ft high and 3 ft wide (up to 175 lbs).
  • High-definition finish for weather and stain resistance and ease of maintenance.


Test ResultsDescription
NAFS (PG)up to LC-PG25


System 4500 Window & Door Brochure
System 4500 Folding Door Sell Sheet
System 4500 Folding Door Specification