9" x 3" Manthorpe Extendable Combination Cavity Wall Sleeve Vent hooks_hardware Can be used with concrete

Can be used with concrete and traditional clay plain tiles

spacious and habitable area to allow swifts to nest within the well built construction of modern houses

These popular birds come to the UK for three months during the summer to raise their young and can be seen on warm evenings giving spectacular displays

Easy surface mounting

Complies fully with relevant Building Regulations and British standards

9" x 3" Manthorpe Extendable Combination Cavity Wall Sleeve Vent hooks_hardware Can be used with concreteProduct Description Extendable Cavity Wall Sleeve Vent Menu Options 9" x 3" Inch Ventilation for heating and gas appliances with integral wind baffle. This vent is to increase the airflow in a room to eliminate condensation with this sleeve vent for heat producing appliances. Extends to suit wall thickness of 190mm 335mm. Additional G935 extension sleeves available in menu options. Each pair of extension sleeves adds on a extra 120 280mm. Finished