The Isokern 300mm internal diameter support block supports large open-fire and double-sided firebox liner systems.

This support block allows smooth transition from flue pipe to chimney liner using stainless steel adapters. Masonry void permits minimum 15mm LECA insulation by builder via brickwork or blockwork. Pumice material delivers high insulation lightweight ease and durable compliance.

• Internal diameter: 300mm
• Material: Volcanic pumice concrete
• Compliance: CE certified to EN 1857. Document J compliant

This liner support block is available for order and fits substantial firebox setups.