The Manthorpe Vertical Extension Sleeve is a black polypropylene extension sleeve for brickwork ventilation, measuring 235mm x 215mm x 50mm and weighing 1kg. It provides a free area of 7000 sq mm.

Product Features:

• Material: Polypropylene
• Colour: Black
• Dimensions: 235 x 215 x 50 mm
• Free Area: 7000 sq mm

This Manthorpe extension sleeve is ideal for building projects requiring effective brickwork ventilation.