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👉 Check Latest PriceDescription Birtley SB140HDX Extra Heavy Duty Internal Wall Lintel, engineered for loadbearing walls with a cavity depth of 140mm. This lintel is perfect for internal block walls (plastered) and is designed to provide maximum strength and stability. An insulated version is also available for improved thermal efficiency. Key Features: Enhanced Protection : Supergalv coating offers significantly increased zinc protection for extended durability. Long-lasting Finish : Post-fabrication galvanizing ensures every surface is well-protected with no inferior coatings. Robust Material : Manufactured from structural grade mild steel S275JR, compliant with EN10025. Fire Resistance : Rated for up to 60 minutes of fire resistance with a two-coat plaster finish.