RD4REDUC – Rytons 125mm to 100mm Reducer (125mm/100mm Dia. Range)

General Details

RD4REDUC – Rytons 125mm to 100mm Reducer (125mm/100mm Dia. Range)

  • Reduces 125mm dia. ducting to fit 100mm dia. components.
  • 100mm dia. male spigot with 125mm dia. female collar.
  • 125mm collar compatible with 125mm dia. Rigid Pipe RD51RND and suits 125mm dia. RytHose range (or use RD5HC).
  • 100mm spigot compatible with 100mm dia. Rigid Pipe RD4/RND and suits 100mm dia. RytHose range (or use RD4HCF).
  • Use with adaptor RD4FR to connect to 110mm x 54mm Flat Channel Duct RD4/M.
  • For use in conjunction with cooker hoods and extraction fans with a maximum output of 500m³ per hour.
  • Suitable for working temperatures -20ºC to 60ºC.


  • Male spigot: 99mm Ext. Dia. x 20mm D.
  • Female collar: 125mm Int. Dia. x 20mm D.

Compatible Components:

  • Rytons Rigid Pipe 1m L RD51RND.
  • Rytons PVC 125mm Diameter RytHose Range
  • Rytons Fire Resistant RytHose 125mm Dia. FAD510M.
  • Rytons Threaded Hose Connector Female RD5HC.
  • Rytons Rigid Pipe 358mm L RD435RND.
  • Rytons Rigid Pipe 1m L RD41RND.
  • Rytons Rigid Pipe 1.5m L RD415RND.
  • Rytons Rigid Pipe 2m L RD42RND.
  • Rytons PVC 100mm Diameter RytHose Range.
  • Rytons Fire Resistant RytHose 100mm Dia. FAD410M.
  • Rytons Threaded Hose Connector Female RD4HCF.
  • Rytons Flat Channel Horizontal Adaptor RD4FR.

Static Pressure Drops in Pascals (Pa):

  • 15 l/s: 1.50.
  • 30 l/s: 5.90.
  • 60 l/s: 24.00.


  • High quality plastic.

NBS Specification:

Rytons is proud to be a family run business and British manufacturer since 1972.

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