Forster Thermfix Variance Frame-type structure of the anti-fire curtain wall system as a separate fire-proof member suitable for building internal and external fire protection field Suitable for large-size glass block, elegant, indoor transparent, large lighting area • Suitable for multi-storey buildings with a height of up to 5 meters per floor Fire rating Ei30/ei60/ei90 E30-e90 ew30-ew60