RD4CG – Rytons Cowled Grille (100mm Dia. Range)

General Details

RD4CG – Rytons Cowled Grille (100mm Dia. Range)

  • External cowl with spigot for rigid pipe and flexible ducting.
  • Gravity flap opens when appliance is in operation.
  • Connects to Rigid Pipe RD4/RND and suits 100mm dia. RytHose range (or use RD4HCF).
  • U.V. stabilised to slow down the effects of sunlight.
  • Part of Rytons 100mm (110mm x 54mm) RytDuct® Range.
  • For applications requiring lower extraction rates such as bathrooms, WCs and cooker hoods.
  • Use with cooker hoods and extraction fans with a maximum output of 250m³ per hour.
  • Suitable for working temperatures -20ºC to 60ºC.


  • 155mm L x 155mm H x 73mm D with 99.5mm Dia. male spigot.

Compatible Components:

  • 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 Threaded Hose Connector Female RD4HCF.
  • Rytons PVC 100mm Diameter RytHose Range.
  • Rytons Fire Resistant RytHose 100mm Dia. FAD410M.
  • Rytons Semi Rigid Aluminium RytHose 102mm Dia. FSRA41.5M.

Free Area:

  • 7,200mm² (72cm²) per unit.


  • Brown: RD4CGBR (bagged RD4CGBRBG).
  • White: RD4CGWH (bagged RD4CGWHBG).
  • Terracotta: RD4CGTC (bagged RD4CGTCBG).
  • Buff/Sand: RD4CGBS (bagged RD4CGBSBG).

Static Pressure Drops in Pascals (Pa):

  • 15 l/s: 4.72.
  • 30 l/s: 17.18.
  • 60 l/s: 62.48.


  • U.V. stabilised high quality plastic.

NBS Plus Specification: