2 x Cavity Wall Combination Extension Sleeves

Manthorpe 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 6600mm²
• Meets NHBC requirements for the control of condensation in buildings.
• Other ventilation fittings for this product available in our shop.

Use

• To provide ventilation for heat producing appliances
• To provide background room ventilation
• For new build, refurbishment and remedial work

Features & Benefits

• Aesthetically pleasing and a simple to install modular system
• Excellent airflow properties
• Independently tested by BRE
• Offers reduction of draughts and light compared to basic through wall ventilation
• Internal finish with open louvre grille

Regulations & Standards

• BRE Digest 17
• BRE Digest 262
• Building Regulations C4
• NHBC Standards 5.2BS 5250:2011 Control of Condensation in Buildings