Packed: 1

• Designed for use with the telescopic underfloor ventilator
• Each extension sleeve allows the vent to reach a further two brick courses vertically
• The sleeve can also be fitted to the base of the telescopic vent to provide horizontal extension through larger cavities
• 6,600mm airflow
• Allows a 3-5 course stagger + 2 courses per unit (a further 150mm vertically or 185mm horizontally)
• Regulations – BRE Digest 17, BRE Digest 262, Building Regulations C4, NHBC Standards 5.2 and BS 5250:2011 Control of Condensation in Building
• Made from polypropylene