Type W Extension Duct
- Material polypropylene.
- Colour grey.
- Size:200/225 x 65 x 10mm.
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.