2 x Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents G935 Air Bricks Fixing screws included

Fixing screws included

Rubber hook end caps for protection

Slate Vent

fire-resistant access to utility services

2 x Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents G935 Air Bricks Fixing screws includedManthorpe G935 Extension Sleeve Pack of 2 Extension Sleeve 9" x 3" for cavity wall ventilators. Part number: G935. Each pair of extension sleeves adds on a extra 120 280mm to the airbrick. Designed to fit to the back of a G930 airbrick. Further horizontal extension can be added. Alternatively it can be stacked to form 9" x 6" or 9" x 9" formations. Provides a maximum equivalent area of 6600mm Meets NHBC requirements for the control of condensation in