Cavity Formers / Closers

Cavity Closers. The Winfit and Winfast Former is a cavity closer designed to reduce the need for surveys by maintaining a rigid, accurate aperture.

It can speed installation and cut site damage by allowing window fitting to take place later in the schedule. The Former works with windows, entrance and French doors.

  • Suitable for brick, block or timber-frame construction
  • Works with PVC-U or timber frames
  • 63mm and 70mm system compatible
  • Guaranteed aperture size
  • Pre-insulated with expanded polystyrene
  • Head vent to Approved Document F.
  • Conforms to NHBC standards
  • Thermal performance complies with Part L of the Building Regulations

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