Designed to extend the reach of the underfloor vent for varying cavity and wall leaf widths.
Top Extension Sleeve
Product Code: HD 9660T
140mm long for an outer leaf width of up to 170mm
Bottom Extension Sleeve
Product Code: HD 9660M
155mm long for an inner leaf width of up to 215mm
Downloads
For more info on this product visit our Downloads page to find: Install Recommendations, Datasheets and Compatibility Charts
