Manthorpe Manthorpe Rectangular-to-Round Duct Adapter – Trade-Grade Roof Vent Connector for Flexible Ducting, Matte Black Plastic, Precision Fit

The Manthorpe Rectangular to Round Duct Adapter is a professional quality solution for connecting rectangular ventilation outlets to round flexible ducting. Designed for use in roof spaces, ceiling voids, and loft installations, it provides a reliable and secure transition where accuracy and durability matter.

Constructed from thick, trade grade plastic, this adapter features reinforced walls and precise moulding to ensure long term strength and stability. Unlike lightweight alternatives, it is built to withstand real installation conditions, including confined spaces and temperature variation.

The smooth internal transition helps maintain airflow efficiency, reducing turbulence and pressure loss within ventilation and extraction systems. Finished in a matte black plastic, it delivers a clean, professional appearance once installed.

Specifications: Size: 240 x 143 x 110mm | Free Vent Area: 8,600mm² | Upper Connection: 235 x 50mm Tile Vent Outlets | Lower Connection: Ø4" (100mm) Pipe | Material: Polypropylene

Delivery:

• Dispatched from our UK warehouse within 1–3 working days.
  
• Free UK delivery on orders over £75.
  
• Same-day dispatch on orders before 1pm.
  

Returns:

• 30-day return window for unused items.
  
• Easy returns via our Customer Support tab.
  
• UK VAT-registered business with full buyer protection.