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fire-resistant access to utility services
• Further horizontal extension can be added
Brown Square Gutter Brackets
Reflective HGV marker boards
2 x Cavity Wall Combination Extension Sleeves for 9" x 3" Air Brick Vents G935 Air Bricks fire-resistant access to utility servicesManthorpe 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
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