Products | Door Hardware | Rapid Spacers
FFI Rapid Spacers
  • Rapid, accurate field installations.
  • Easy future re-adjustment to keep frames plumb and level.
  • Lower parts and labor costs for field installation and service.
  • FFI Rapid Spacers passed Miami Dade hurricane tests for lift slide doors.
  • Cost-effective, with volume discounts.

FFI Rapid Spacers are for all types of sashes:

  • Doors or windows
  • Wood, aluminum, and PVC/vinyl frames

Manufacturers using Proni Rapid-Block Spacers for lift slide and other types of doors and windows include Kolbe & Kolbe, Kommerling, Rehau, Veka & more.

Rapid Spacers have passed Miami Dade Building Code hurricane tests (visit, Search by File 08-0915.03, Lift & Slide Wood Clad Aluminum Sliding Glass Door, rated 40 dpi, report page E-2 “Proni Group series 600 structural load bearing shim complying with ASTM D412.”)

  • Various sizes of rapid-block spacers are available for different sash configurations; see Data Sheets.
  • For number and placement of rapid-block spacers that may be needed per rough opening; see Data Sheets.

Installation tools, drill bits, and other accessories are available for Rapid Spacers; see Data Sheets for details.

FFI Rapid Spacers

For installation and adjustment of doors and windows, Rapid Spacers are faster, easier, more accurate, and more cost-effective than the shims of yester-year.

Contact FFI

For CAD drawings, pricing, BOM calculator and more.