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2x Cavity Wall Combination Extension Sleeves

Original price £8.49 - Original price £8.49
Original price
£8.49
£8.49 - £8.49
Current price £8.49

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.

 

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