Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents - B&Q - G935

Manthorpe G935 Extension Sleeve Pack of 2. This extension sleeve is designed for 9" x 3" cavity wa...

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Home.smart Extension Sleeve For Underfloor Adjustable Telescopic Cavity Wall Vents G961

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Manthorpe G935 Extension Sleeve Pack of 2. This extension sleeve is designed for 9" x 3" cavity wall ventilators. Each pair of extension sleeves adds an extra 120 - 280mm to the airbrick and is designed to fit to the back of a G930 airbrick. Further horizontal extension can be added, or it can be stacked to form 9" x 6" or 9" x 9" formations. It provides a maximum equivalent area of 6600mm². This product meets NHBC requirements for the control of condensation in buildings. It is suitable for providing ventilation for heat-producing appliances and for background room ventilation in new build, refurbishment, and remedial work. Features and benefits include an aesthetically pleasing and simple-to-install modular system with excellent airflow properties. It has been independently tested by BRE and offers a reduction of draughts and light compared to basic through-wall ventilation, with an internal finish provided by an open louvre grille. This product complies with BRE Digest 17, BRE Digest 262, Building Regulations C4, NHBC Standards 5.2, and BS 5250:2011 Control of Condensation in Buildings.