Birtley CB70 Cavity Wall Standard Duty Lintel 2100 mm Underground Drainage Designed to convert vents into

Designed to convert vents into service terminals

Heat loss reduced due to continuous seal around trap door

Most commonly used for roof applications

Suitable for light applications

Ductile iron

Birtley CB70 Cavity Wall Standard Duty Lintel 2100 mm Underground Drainage Designed to convert vents intoStandard duty cavity wall lintel manufactured from structural grade steel Cavity: 70 mm 85 mm Outer Leaf: 100 mm Inner Leaf: 100 mm 60 minute fire rating with 2 coat plaster finish Lack of baseplate and factory fitted expanded polystyrene insulation reduces thermal bridging Not suitable for point loads or concrete floors Loading SWL UDL Value: 20 kN