Nesvent White 4-Inch Gravity Grille 155Mm External Dimension Ducting Air Vent With 100Mm - 4 Inch Round Rear Spigot And Not-Return Shutters

NESVENT Connector with Backdraught Shutter 100mm - 4 inch Non-Return Damper Flap to Connect Duct Pipe or Flexible Ducting Hose Backdraft Stopper Backflow Valve Connector

NESVENT Connector with Backdraught Shutter 150mm - 6 inch Non-Return Damper Flap to Connect Duct Pipe or Flexible Ducting Hose Backdraft Stopper Backflow Valve Connector

Ducting Reducer 125mm to 100mm, PVC 5 to 4 inch Ducting Joint to Connect Round Duct Pipe or Extractor Fans

Pack of 3 Connector with Backdraught Shutter 100mm - 4 inch Non-Return Damper Flap to Connect Duct Pipe or Flexible Ducting Hose