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👉 Check Latest PriceDescription The Birtley HDX90 Extra Heavy Duty Cavity Wall Lintel is engineered to support cavity walls with a 90-105mm cavity and 100mm inner and outer leaves. Designed for extra heavy-duty applications, this lintel requires a solid, fully jointed blockwork infill on the inner leaf for optimal performance. Key Features: Supergalv Coating : Provides up to 50% more zinc protection for a longer lifespan. Complete Surface Protection : Post-fabrication galvanizing ensures full protection against corrosion. High-Quality Material : Made from structural grade mild steel S275JR to BS EN10025 standards. Fire Rating : 60-minute fire resistance with two-coat plaster finish. Thermal Performance : Optional Expanded Polystyrene insulation with BREEAM rating A+.