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Type W Extension Duct

Available in 2 variations


  • Material polypropylene.
  • Colour grey.
  • Size:200/225 x 65 x 10mm.
  • 320mm²
£1.06 + VAT
£47.00 + VAT



To extend Type W to accommodate masonry of greater thickness.


The Type W extension duct is designed to push-fit onto the Type W Caviweep/Cavivent.It converts the standard Type W into a
305mm straight through model.

It may also be used to extend the Type W when employed within a solid retaining wall to provide moisture release.


  • Material polypropylene.
  • Colour grey.
  • Size:200/225 x 65 x 10mm.
  • 320mm²
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