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👉 Check Latest PriceDescription The Birtley HD150 Heavy Duty Cavity Wall Lintel is engineered for cavity walls with a cavity width of 150-165mm, designed to support both 100mm inner and outer leaves. This lintel must be installed with a solid, fully jointed blockwork infill on the inner leaf to ensure maximum stability and performance. Key Features: Supergalv Coating : Provides up to 50% more zinc protection for an extended lifespan. Full Surface Protection : Post-fabrication galvanizing ensures all surfaces are protected against corrosion. High-Quality Material : Made from structural grade mild steel S275JR to BS EN10025 standards. Fire Rating : 60-minute fire resistance when finished with a two-coat plaster system. Thermal Performance : Insulated with Expanded Polystyrene, achieving a BREEAM rating of A+.