RD4GG – Rytons Gravity Grille (100mm Dia. Range)

General Details

RD4GG – Rytons Gravity Grille (100mm Dia. Range)

  • Low profile gravity grille with spigot for rigid pipe and flexible ducting.
  • Gravity flaps open 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 16mm 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: RD4GGBR (bagged RD4GGBRBG).
  • White: RD4GGWH (bagged RD4GGWHBG).
  • Terracotta: RD4GGTC (bagged RD4GGTCBG).
  • Buff/Sand: RD4GGBS (bagged RD4GGBSBG).

Static Pressure Drops in Pascals (Pa):

  • 15 l/s: 10.94.
  • 30 l/s: 18.59.
  • 60 l/s: 24.21.


  • U.V. stabilised high quality plastic.

NBS Plus Specification: